The Different Types of Fire Extinguishers Available In 2026

Estimated reading time: 8 minutes

Choosing the right fire extinguisher is more complex than most people realise. You’re weighing up different types, understanding fire classifications and matching the correct extinguisher to your environment. This guide provides practical guidance to help you navigate the fire extinguisher market with confidence, avoid costly mistakes and make decisions that could save lives and property.

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In this guide:
  • What specific features should you consider when selecting a fire extinguisher?
  • How do fire extinguisher comparisons help you choose the right type?
  • Which fire extinguisher types are best for specific applications?
  • What alternatives should you consider beyond standard fire extinguishers?
  • What are the key indicators of quality when evaluating fire extinguishers?
  • Frequently Asked Questions

What specific features should you consider when selecting a fire extinguisher?

Making the right choice requires a systematic evaluation of your environment and fire risks. Use this framework to identify the most suitable extinguisher type for your needs:

1

Step 1: Identify Your Fire Risks

  • Class A fires (solid combustibles): Wood, paper, cardboard, fabrics and coal
  • Class B fires (flammable liquids): Petrol, oils, paints and spirits
  • Class C fires (flammable gases): Propane, butane and natural gas
  • Class D fires (combustible metals): Magnesium, aluminium and titanium
  • Class F fires (cooking oils): Deep fat fryers, cooking fats and oils
  • Electrical fires: Live electrical equipment such as computers, servers and appliances
  • Class L fires: Fires involving lithium-ion
2

Step 2: Assess Your Environment

What’s around you? Indoor or outdoor spaces matter. So does sensitive equipment like computers and electronics. Think about areas where people gather: schools, offices, public spaces. Consider confined spaces too: vehicles, boats, caravans.

And don’t forget commercial kitchens, residential cooking areas and industrial settings with flammable liquids or gases.

3

Step 3: Consider Practical Factors

  • Maintenance requirements: Service-free P50 extinguishers need no engineer visits for 10 years. Traditional extinguishers require annual servicing.
  • Environmental impact: Water mist and eco-foam options contain no PFAS chemicals.
  • Residue and clean-up: CO2 and water mist leave minimal residue. Powder creates extensive mess.
  • Electrical safety: Look for dielectric testing certification (typically 5kV) for use near live equipment.
  • Portability: Weight and size matter, especially for elderly users or in domestic settings.
4

Step 4: Determine Size and Coverage

Calculate coverage based on floor area: 0.065 litres per square metre for Class A risks. Travel distance must not exceed 30 metres for Class A and C risks, or 10 metres for Class B and F risks. Multiple smaller units often provide better coverage than one large extinguisher.

5

Step 5: Verify Compliance

  • BS EN3 certification (red body with coloured label)
  • BS Kitemark for quality assurance
  • MED approval for marine use if required
  • BAFE certification for maintenance operations

How do fire extinguisher comparisons help you choose the right type?

Understanding each extinguisher type reveals their strengths and limitations.

Water extinguishers excel at tackling Class A fires with solid combustibles. They’re economical for offices and warehouses. However, you must never use them on electrical equipment or burning liquids.
Water mist extinguishers represent a significant advancement. They offer versatility across Class A, B, C, F and electrical fires through de-ionised water that’s safe around sensitive equipment. No damaging residue either.
CO2 extinguishers provide residue-free firefighting for electrical and flammable liquid fires. Perfect for server rooms and laboratories. However, the gas disperses quickly, which can allow re-ignition.
Foam extinguishers tackle Class A and B fires effectively. They provide a cooling effect that prevents re-ignition. Traditional AFFF foams contain harmful PFAS chemicals, so we stock fluorine-free eco-foam alternatives exclusively.
Dry powder extinguishers offer the broadest fire class coverage: A, B and C. They work well in outdoor environments and vehicles. But discharge creates vision-blocking clouds unsuitable for indoor use or escape routes.
Wet chemical extinguishers target Class F cooking oil fires specifically. They work through a chemical reaction that creates a soapy layer preventing re-ignition. Essential in commercial kitchens with deep fat fryers.
Service-free P50 extinguishers provide a 10-year maintenance-free guarantee in water mist and eco-foam variants. They dramatically reduce lifetime costs compared to traditional extinguishers requiring annual engineer visits and five-yearly pressure testing.
Water extinguishers excel at tackling Class A fires with solid combustibles. They’re economical for offices and warehouses. However, you must never use them on electrical equipment or burning liquids.
Water mist extinguishers represent a significant advancement. They offer versatility across Class A, B, C, F and electrical fires through de-ionised water that’s safe around sensitive equipment. No damaging residue either.
CO2 extinguishers provide residue-free firefighting for electrical and flammable liquid fires. Perfect for server rooms and laboratories. However, the gas disperses quickly, which can allow re-ignition.
Foam extinguishers tackle Class A and B fires effectively. They provide a cooling effect that prevents re-ignition. Traditional AFFF foams contain harmful PFAS chemicals, so we stock fluorine-free eco-foam alternatives exclusively.
Dry powder extinguishers offer the broadest fire class coverage: A, B and C. They work well in outdoor environments and vehicles. But discharge creates vision-blocking clouds unsuitable for indoor use or escape routes.
Wet chemical extinguishers target Class F cooking oil fires specifically. They work through a chemical reaction that creates a soapy layer preventing re-ignition. Essential in commercial kitchens with deep fat fryers.
Service-free P50 extinguishers provide a 10-year maintenance-free guarantee in water mist and eco-foam variants. They dramatically reduce lifetime costs compared to traditional extinguishers requiring annual engineer visits and five-yearly pressure testing.

Shop Water Mist Fire Extinguishers

Discover our full range of water mist fire extinguishers to find the right one for your home or business.
P50 6 litre water mist fire extinguisher on a stand

Shop Foam Fire Extinguishers

Discover our full range of foam fire extinguishers to find the right one for your home or business.
P50 fluorine-free foam fire extinguisher

Shop CO2 Fire Extinguishers

Discover our full range of CO2 fire extinguishers to find the right one for your home or business.
CO2 fire extinguisher

Shop Dry Powder Fire Extinguishers

Discover our full range of dry powder fire extinguishers to find the right one for your home or business.
Firechief 600g powder fire extinguisher with bracket

Shop Wet Chemical Fire Extinguishers

Discover our full range of wet chemical fire extinguishers to find the right one for your home or business.
Ultrafire 6 litre wet chemical fire extinguisher

Which fire extinguisher types are best for specific applications?

One consideration cuts across almost every environment on this list. Lithium-ion batteries are now everywhere: laptops, tablets, smartphones, power tools, e-bikes and scooters. When these batteries fail, they can enter thermal runaway: a self-sustaining reaction that generates intense heat and is notoriously difficult to extinguish with a standard unit. Wherever lithium-ion devices are regularly charged or stored, a specialist lithium-ion extinguisher must be considered.

Shop Lithium-Ion Battery Fire Extinguishers

Discover our full range of lithium-ion fire extinguishers to find the right one for your home or business.
P50 service-free lithium-ion fire extinguisher

Homes

Domestic homes benefit most from 1-3 litre water mist extinguishers. They handle the majority of household fire risks including electrical equipment. Add a fire blanket for kitchen areas. Got a deep fat fryer? Include a wet chemical extinguisher alongside the water mist unit.

Offices

Office environments typically require water or foam extinguishers for paper fires paired with CO2 units near server rooms and electrical distribution boards. Position extinguishers along escape routes and near exits.

Commercial Kitchens

You’ll need wet chemical extinguishers rated for your specific fryer capacity. Size depends on the volume of cooking oil you’re dealing with.

Industrial Workshops and Garages

These perform best with dry powder extinguishers. They tackle flammable liquids and gases common in these settings, but adequate ventilation is essential.

Vehicle Protection

This varies by type. Cars and motorcycles suit compact powder extinguishers that fit easily into vehicles. Vans and small trucks benefit from larger powder units. HGVs and vehicles carrying dangerous goods require substantial capacity units with secure mounting.

Marine Applications

You must specify MED-approved extinguishers designed for the harsh marine environment. Powder or CO2 types for engine bays. Water mist for cabin areas.

Server Rooms and Data Centres

These demand CO2 or water mist extinguishers that won’t damage sensitive electronic equipment. We prefer CO2 where equipment density is high.

Schools and Public Buildings

Prioritise water mist extinguishers for their broad-spectrum capability and minimal user risk. They’re non-toxic and safe around children.

Care Homes and Hospitals

You need extinguishers that residents and staff can operate easily. Lighter water mist units are ideal with clear signage and regular training.

What alternatives should you consider beyond standard fire extinguishers?

Portable fire extinguishers form the foundation of fire safety. But several alternatives address specific challenges.

Fire blankets provide an essential complement in kitchens. They smother small pan fires and provide wrap-around protection for clothing fires. They lack the range and power of extinguishers for larger incidents though.

Automatic extinguishers suit unmanned areas: engine compartments, electrical cabinets and server racks. They activate when temperature thresholds are exceeded without human intervention.

Wheeled extinguishers serve industrial premises, warehouses and car parks where fire loads are substantial. These heavy-duty units typically range from 25kg to 50kg, though larger capacity units are available for high-risk applications. They provide extended discharge times and greater firefighting capacity than portable units.

Need something ultra-compact? Aerosol extinguishers offer protection for vehicles, boats and caravans where space is limited. Their capacity restricts them to very small fires though.

Lithium-ion extinguishers represent new technology. They use Aqueous Vermiculite Dispersion (AVD) to cool battery fires and control thermal runaway. Essential for premises with electric vehicles, e-bikes or significant battery storage.

Fire suppression systems provide automatic protection for commercial kitchens, computer rooms and industrial processes. They detect and suppress fires before they spread.

Stainless steel fire extinguishers combine full functionality with premium aesthetics. They blend into modern offices and hospitality environments and offer complete corrosion resistance.

For landlords managing multiple properties, service-free P50 extinguishers eliminate the administrative burden and cost of coordinating annual maintenance visits across numerous sites.

Fixed installation systems using clean agent technology suit environments where water or powder damage would be catastrophic: museums, archives and telecommunications facilities.

What are the key indicators of quality when evaluating fire extinguishers?

Quality Indicators (Green Flags) Common Selection Mistakes (Red Flags)
BS EN3 certification with BS Kitemark confirming British Standards compliance Choosing based solely on price without considering fire class suitability
Clear colour-coded labels (red body with colour-coded band) indicating extinguisher type Selecting powder extinguishers for indoor domestic use despite visibility and respiratory risks
Fire rating clearly displayed (e.g. 13A, 55B) showing firefighting capacity Installing only one extinguisher type when multiple fire risks exist
Dielectric testing certificate (5kV or 35kV) for electrical safety if required Positioning extinguishers too far from high-risk areas (exceeding 30m for Class A, 10m for Class B/F)
5-10 year manufacturer warranty demonstrating product confidence Mixing old BS 5423 extinguishers (fully coloured bodies) with modern EN3 types
Pressure gauge visible on front for monitoring charge status Purchasing without conducting a proper fire risk assessment
LPCB or similar third-party testing certification Neglecting to train staff on correct extinguisher use for different fire types
Stainless steel valve and components resisting corrosion Choosing extinguishers without considering clean-up and residue impact
Eco-friendly options (fluorine-free foam, water mist) with minimal environmental impact Ignoring maintenance requirements and ongoing service costs
MED approval for marine applications if needed Selecting oversized extinguishers that staff cannot lift or operate effectively
Quality Indicators (Green Flags)
BS EN3 certification with BS Kitemark confirming British Standards compliance
Common Selection Mistakes (Red Flags)
Choosing based solely on price without considering fire class suitability
Quality Indicators (Green Flags)
Clear colour-coded labels (red body with colour-coded band) indicating extinguisher type
Common Selection Mistakes (Red Flags)
Selecting powder extinguishers for indoor domestic use despite visibility and respiratory risks
Quality Indicators (Green Flags)
Fire rating clearly displayed (e.g. 13A, 55B) showing firefighting capacity
Common Selection Mistakes (Red Flags)
Installing only one extinguisher type when multiple fire risks exist
Quality Indicators (Green Flags)
Dielectric testing certificate (5kV or 35kV) for electrical safety if required
Common Selection Mistakes (Red Flags)
Positioning extinguishers too far from high-risk areas (exceeding 30m for Class A, 10m for Class B/F)
Quality Indicators (Green Flags)
5-10 year manufacturer warranty demonstrating product confidence
Common Selection Mistakes (Red Flags)
Mixing old BS 5423 extinguishers (fully coloured bodies) with modern EN3 types
Quality Indicators (Green Flags)
Pressure gauge visible on front for monitoring charge status
Common Selection Mistakes (Red Flags)
Purchasing without conducting a proper fire risk assessment
Quality Indicators (Green Flags)
LPCB or similar third-party testing certification
Common Selection Mistakes (Red Flags)
Neglecting to train staff on correct extinguisher use for different fire types
Quality Indicators (Green Flags)
Stainless steel valve and components resisting corrosion
Common Selection Mistakes (Red Flags)
Choosing extinguishers without considering clean-up and residue impact
Quality Indicators (Green Flags)
Eco-friendly options (fluorine-free foam, water mist) with minimal environmental impact
Common Selection Mistakes (Red Flags)
Ignoring maintenance requirements and ongoing service costs
Quality Indicators (Green Flags)
MED approval for marine applications if needed
Common Selection Mistakes (Red Flags)
Selecting oversized extinguishers that staff cannot lift or operate effectively

We’ve established ourselves as the UK’s leading fire safety provider through an unwavering commitment to customer satisfaction, environmental responsibility and technical expertise. With ISO9001 certification, BAFE-certified engineers and membership in the Fire Industry Association, we deliver comprehensive fire safety solutions backed by award-winning customer service.

Our specialist team provides fire risk assessments, free test reminders, and log books. Our 100% renewable electricity operations and innovative service-free extinguisher range demonstrate genuine environmental stewardship. Whether you need a single smoke alarm or a nationwide contract, we combine competitive pricing with technical knowledge that’s secured partnerships with major institutions including the Church of England.

For personalised guidance on selecting the optimal fire extinguishers for your specific needs, contact our expert team. We’ll ensure your fire safety provisions meet both legal requirements and best practice standards.

Frequently Asked Questions

How many types of fire extinguisher are there in the UK?

There are six main types: water, foam, CO2, dry powder, water mist and wet chemical. More recently, specialist lithium-ion battery extinguishers using Aqueous Vermiculite Dispersion (AVD) have been introduced to address growing risks from e-bikes, electric vehicles and rechargeable devices. Service-free P50 extinguishers are also available in water mist and eco-foam variants, offering the same firefighting capability with significantly reduced maintenance requirements.

What is the most versatile fire extinguisher for home use?

A water mist extinguisher is generally the best all-round choice for domestic settings. It tackles Class A, B and C fires as well as electrical fires, and contains only de-ionised water, making it non-toxic, residue-free and safe to use around children and pets. For homes with a deep fat fryer, add a small wet chemical extinguisher and a fire blanket for full kitchen coverage.

Why are AFFF foam fire extinguishers being phased out?

AFFF foam contains PFAS chemicals, often called “forever chemicals”, which persist in the environment and are harmful to people and wildlife. UK legislation is progressively restricting their manufacture and use. Fluorine-free eco-foam and water mist extinguishers are the recommended replacements, offering equivalent fire class coverage without the environmental harm.

Do I need different fire extinguishers for different rooms?

Yes. The correct extinguisher depends on the fire risks present in each area. Offices typically need water mist or foam paired with CO2 near electrical equipment. Kitchens require wet chemical extinguishers for cooking oil fires. Garages and workshops suit dry powder for flammable liquid and gas risks. A fire risk assessment will identify exactly what’s needed and where.

What is a P50 service-free fire extinguisher and how does it save money?

P50 extinguishers are composite-construction units that don’t corrode and don’t require annual servicing by an engineer for 10 years. Traditional steel extinguishers need yearly professional servicing plus a discharge and refill at five years. P50s eliminate those recurring costs, and their 20-year total lifespan is double that of conventional extinguishers, making them significantly cheaper to own over time.

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

What do we do to maintain our emergency lighting

What do we do to maintain our emergency lighting? It’s a question that doesn’t get asked nearly enough. Emergency lighting maintenance is one of those things nobody prioritises until they really, really need it. The power cuts out and suddenly those glowing green exit signs are the most important things in the building. Not to mention the fact that the law requires you to maintain emergency lighting in your building, and the stakes are higher than most people realise.

Whether you are responsible for a busy office, a bustling shop, a rented property or a sprawling commercial site, this guide covers everything you need to know when it comes to properly maintaining your emergency lighting.

  💡In This Guide

  • What Is Emergency Lighting?
  • What Is the Purpose of Emergency Lighting?
  • Where Is Emergency Lighting Required?
  • How Often Should Emergency Lighting Be Tested?
  • How to Test Emergency Lighting
  • Who Can Test Emergency Lighting?
  • What Do We Do to Maintain Our Emergency Lighting?

What Is Emergency Lighting?  

Emergency lighting is a battery-backed lighting system that activates automatically when the mains power supply fails. Unlike standard light fittings, these do not rely on the grid. They have their own internal power source, so when the likes of a powercut happen, people can still see where they are going.

There are two main types: escape route lighting illuminates the path people need to follow to get out safely, while standby lighting allows normal activities to continue during a power failure. This is most common in places such as hospitals or control rooms where work simply cannot stop. Most systems are either Maintained (on all the time) or non-maintained (only activating when the mains fails). The type you need depends on how your building is used.

What Are Illuminated Exit Signs?

Illuminated exit signs are technically a form of emergency lighting, but they cause more confusion than you might expect, largely because people are not always sure whether they should be on all the time or only during an emergency.

Those green running-man signs above fire doors need to be either maintained (always illuminated) or non-maintained (only lit during an emergency). In most public buildings, maintained signs are the standard. The logic is simple: you want people to know exactly where the exits are before a fire breaks out, not just when they are already scrambling to find them.

What Is the Purpose of Emergency Lighting?

The purpose of emergency lighting is to keep people safe when an emergency plunges a building into darkness. This could be anything from a powercut to a fire. 

Without it, evacuation becomes dangerous. People trip, panic, lose their bearings and struggle to find exits they would otherwise walk past every day. There is also a legal dimension. The Regulatory Reform (Fire Safety) Order 2005 requires it for most non-domestic premises in England and Wales. Equivalent legislation covers Scotland and Northern Ireland. Your fire risk assessment should identify whether it is needed and where; if it does, you are obligated to install and maintain the system correctly.  

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💡Where Is Emergency Lighting Required?

Emergency lighting is required anywhere that a loss of mains lighting would put people at risk. In practice, that means most areas of most commercial buildings. The fittings are typically needed in:

  • Escape routes, including corridors and stairwells
  • Open plan areas where people work or gather
  • Changing rooms and toilet facilities above a certain size
  • Locations housing fire fighting equipment
  • Areas around fire alarm call points
  • Any spot containing a hazard that someone might walk into in the dark

That last one is worth thinking about carefully. A poorly lit plant room or a stairwell with an awkward turn can be seriously dangerous without adequate lighting during an emergency.

Does My Building Need Emergency Lighting?  

Most commercial and public buildings will need some form of it. This includes:

  • Offices and retail premises
  • Schools, hospitals and care homes
  • Hotels and leisure facilities
  • Places of worship
  • HMOs and buildings with shared communal areas

If you are unsure, a professional fire risk assessment for your premises is the right way to establish your specific requirements. Standard single-occupancy homes are generally exempt, but properties with shared areas, such as blocks of flats, will almost certainly need it in common parts like corridors and stairwells.  

How Often Should Emergency Lighting Be Tested?  

Emergency lighting should be tested more often than most people realise. Emergency lighting is not a fit-and-forget installation; it needs regular, documented testing to remain compliant and, more importantly, to actually work when it is needed.

BS 5266-1:2025 (the British Standard that governs emergency lighting, updated in October 2025 to replace the previous 2016 edition) sets out a clear schedule. Here is what it looks like:

Test type Frequency Duration Who can do it
Short functional test Monthly ~1 minute Competent in-house person
Full rated discharge test Annually 3 hours Competent person or qualified contractor
Test type
Short functional test
Frequency
Monthly
Duration
~1 minute
Who can do it
Competent in-house person
Test type
Full rated discharge test
Frequency
Annually
Duration
3 hours
Who can do it
Competent person or qualified contractor

The monthly test is a quick check to confirm the system activates. The annual test is the proper stress test; it runs the batteries down to their full rated duration to confirm they can sustain the system when it counts.

Some modern systems come with self-testing functionality, where each luminaire carries out its own checks automatically and logs the results. For larger sites, this can be a genuine time-saver and is well worth considering.  

How to Test Emergency Lighting

Thankfully, testing isn’t complicated. It does, however, need to be done properly and recorded every single time.  

Monthly Emergency Lighting Test (Short Functional Test)

The monthly test is about confirming basic functionality. You are simply checking that the lights come on when the mains power is interrupted and that exit signs illuminate as they should.

To carry it out, the mains supply to the emergency lighting circuit is interrupted; either via a key switch, a dedicated test switch or by isolating the circuit at the distribution board. The fittings should activate immediately. Once you have confirmed they are working, restore the mains supply and allow the batteries to recharge. Keep the test short to avoid draining the batteries unnecessarily.

Log the date, the tester’s name and the outcome straight away. Do not leave it until the end of the week.

Annual Emergency Lighting Test (Full Duration Test)

Annual emergency lighting takes a bit more planning. The mains supply is cut for the full rated duration of the system (three hours for most installations) and the lights must remain functional throughout. At the end of the test, every luminaire and sign is checked to confirm it is still illuminated.

As this discharges the batteries significantly, it needs to happen at a time when the building will not need the system to work in an emergency for at least 24 hours afterwards. For sites that are occupied around the clock, that takes some coordination.

Any faults found during the annual test must be repaired and retested before the system is signed off. A failed luminaire or a battery that gives up the ghost partway through needs to be fixed before you can consider the test complete.

Who Can Test Emergency Lighting?  

The monthly functional test can be carried out by a competent, trained member of staff. This basically means someone who understands the system, knows how to use the test switches and isolation procedures and can record the results accurately. A specialist contractor isn’t needed in this scenario, so long as your staff member actually knows what they are doing.

The annual full duration test is a different matter, however. Technically, a competent internal team member can still carry it out. In practice, many organisations bring in a qualified electrical contractor or specialist fire safety engineer for this one, and there are good reasons for that. The annual test involves extended electrical isolation, a thorough inspection of every fitting and a proper assessment of battery condition. Missing a fault at this stage is not just a paperwork problem.

Does Emergency Lighting Testing Need to Be Certified?

For many premises, yes. Buildings subject to third-party audits, specific insurance requirements or licensing conditions will often need a written certificate confirming the annual test was carried out to BS 5266-1. A qualified contractor can provide this, which gives building owners and managers a useful layer of documented assurance.

If you manage a large or complex site, a maintenance contract covering both monthly and annual testing is worth serious consideration. It removes the risk of something slipping through the cracks, which (speaking from experience dealing with a lot of building managers) happens more often than anyone likes to admit.

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What Do We Do to Maintain Our Emergency Lighting?  

Good emergency lighting maintenance comes down to a consistent process, carried out by people who know what they are looking for every single time.

Here is what a solid regime looks like in practice:

  • Monthly: A short functional test confirms all luminaires and exit signs activate correctly. Results go into the log book the same day.
  • Annually: A full rated discharge test is completed, batteries are assessed, any faults are repaired and the system is certified as compliant with BS 5266-1.
  • Ongoing: Any faults spotted during routine checks are dealt with promptly. A dim luminaire, a cracked fitting or a failing exit sign LED should never be left for the next scheduled test. Emergency lighting faults are not the kind of thing to add to a to-do list and forget about.

It’s also worth carrying out a visual inspection as part of your regular fire safety walkround. Fittings should be clean, undamaged, unobstructed and positioned correctly. If someone has moved a cabinet in front of an exit sign, or a new partition has been put up that leaves a dark patch in an escape route, those problems need fixing outside of the formal test schedule.

Keeping Records

This deserves its own mention, because it is the part that most often gets overlooked. A testing log is not a bureaucratic formality, but your evidence of compliance. Without it you have very little to show anyone who asks.

Your log should record every test carried out: the date and time, the name of the person responsible, the outcome and any remedial actions taken. Safelincs offers free fire safety log books to help with exactly this, ready for download instantly.

A system that has not been tested, has failing batteries or leaves dark spots in an escape route is a real risk to real people. The good news is that maintaining it properly is not complicated. A clear testing schedule, a reliable log book and competent people carrying out the checks will cover the vast majority of what you need.

If you need support, whether that is sourcing the right emergency lighting fittings and luminaires, getting clarity on your legal obligations or arranging a fire risk assessment, the Safelincs team is here and genuinely happy to help. Feel free to get in touch and we’ll answer any query you may have.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

Can You Extinguish a Lithium-ion Battery Fire?

You may not realise it, but lithium-ion (Li-ion) batteries are everywhere. Your phone, your laptop, the power drill in the garage, your kid’s e-scooter – they all run on the same rechargeable technology. Most of the time, they’re perfectly safe. When something goes wrong, however, the fire risk is a very different beast to anything we’ve traditionally dealt with. So, can you extinguish a lithium-ion battery fire? And if so, how? Let’s take a look at what fire safety technology exists to help.

💡
Contents

  • What Class of Fire Is a Lithium-Ion Battery?
  • How Hot Is a Lithium-Ion Battery Fire?
  • What to Do If a Lithium-Ion Battery Catches Fire
  • How to Put Out a Lithium-Ion Battery Fire

What Class of Fire Is a Lithium-Ion Battery?

This is a question that’s had the fire safety industry scratching its head for years, simply because it’s not always been clear. Traditionally, fires are split into classes based on the fuel type: Class A for solids, Class B for flammable liquids, Class D for metals, and so on. Lithium-ion battery fires never sat neatly in any of these boxes.

That’s now changed. In February 2026, the revised standard BS ISO 3941:2026 introduced a brand new category named Class L specifically for fires involving lithium-ion cells and batteries. It’s a landmark update that formally acknowledges what fire safety professionals have long known: these fires behave in a completely different way to anything else.  
Fire Class Type of Fire
A Solid materials (wood, paper, textiles)
B Flammable liquids
C Flammable gases
D Combustible metals
F Cooking oils and fats
L Lithium-ion cells and batteries (new, 2026)
Fire Class
A
Type of Fire
Solid materials (wood, paper, textiles)
Fire Class
B
Type of Fire
Flammable liquids
Fire Class
C
Type of Fire
Flammable gases
Fire Class
D
Type of Fire
Combustible metals
Fire Class
F
Type of Fire
Cooking oils and fats
Fire Class
L
Type of Fire
Lithium-ion cells and batteries (new, 2026)

Unlike conventional fires, a Class L fire is driven by electrochemical reactions happening inside the battery, not just surface combustion. The battery essentially becomes its own fuel source, which is what makes it so tricky to deal with. While Class L does not currently create new UK legal duties on its own, it does mean your fire risk assessment should now explicitly consider the presence of lithium-ion batteries. If it doesn’t, it’s likely out of date.

How Hot Is a Lithium-Ion Battery Fire?

Short answer: extremely hot. We’re talking melt-your-tools hot.

A lithium-ion battery fire is caused by a process called thermal runaway. This is, in short, a chain reaction where heat triggers more heat, gases are released, and the fire becomes self-sustaining. Once it starts, it accelerates fast. Battery temperatures during thermal runaway typically range between 200°C and 1,000°C, and in large battery packs or electric vehicles, temperatures can climb even higher.

To put that into context, a petrol-powered vehicle fire burns at around 815°C. An EV fire? Closer to 2,760°C at its peak.

The reason these fires are so ferocious is that decomposing battery cathodes release oxygen as they break down, meaning the fire can sustain itself even when you cut off the external oxygen supply. Smothering it simply doesn’t work in the same way it would with a conventional fire. There’s also the small matter of the toxic gases (including carbon monoxide and hydrogen) that are produced during thermal runaway and present a serious risk to anyone nearby.

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⚠️

What to Do If a Lithium-Ion Battery Catches Fire

First things first: if it’s a large fire, or you have any doubt whatsoever, evacuate the area and call 999 immediately. Li-ion fires spread fast and the fumes are toxic, so put your safety first.

That said, if a fire is caught very early or you suspect your lithium-ion battery device is about to go into thermal runaway, you may be able to act quickly and safely. Here’s a general guide:

  • Stop using the device immediately if you notice swelling, overheating, unusual smells, or discolouration
  • Move the device away from flammable materials if it’s safe to do so
  • Do not use a standard water or CO₂ extinguisher as these are likely to be ineffective and could make things worse
  • Use a purpose-built lithium-ion extinguisher if you have one to hand and the fire is very small
  • Call 999 if there’s any doubt and make sure everyone is out of the area
For electric vehicles, the guidance is even clearer: do not attempt to fight the fire yourself. The volume of energy involved makes it beyond the scope of personal firefighting equipment. The London Fire Brigade has useful guidance on safe charging and storage habits worth reading if you have an EV or e-bike at home.  

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Lithco 6lr Lithium-Ion Batery Fire Extinguisher

Designed specifically for use on rechargeable lithium-ion battery fires, the LB6 fire extinguisher satisfies modern fire risks in a cost-effective, multi-purpose solution.

  • Designed for UPS systems, laptops, power tools, and bulk device chargers
  • Heat dispersing, low-viscosity agent to penetrate battery casings
  • Rigid applicator lance for enhanced control and user safety
  • Third-party tested up to 360Wh battery capacity

£179.00 ex VAT

£214.80 inc VAT

How to Put Out a Lithium-Ion Battery Fire  

Given that Class L fires are self-oxygenating and can reignite even after appearing extinguished, the goal shifts from “put it out” to “cool it down and contain it.” There are now products specifically designed for exactly that.

Lithium-Ion Fire Extinguishers

There are two types of extinguisher designed specifically for li-ion battery fires.

The Lithco LB6 Fire Extinguisher is a water-based extinguisher containing a special additive called P Foam. Unlike standard water extinguishers, the agent in the LB6 is designed to penetrate through the outer casing of an electrical device and reach the battery itself. It’s been rigorously third-party tested up to 360Wh battery capacity and is proven effective on li-ion fires in handheld devices, laptops and power tools. It’s also safe to use on live electrical equipment up to 1,000V, and handles Class A fires too, making it a versatile unit to have around.

The second type uses an Aqueous Vermiculite Dispersion (AVD) agent. Rather than simply suppressing flames, AVD works by surrounding the burning battery cells and forming a crust around the device, cutting off the fire and acting as a physical barrier that stops it spreading beyond the battery or device itself.

AVD extinguishers are increasingly the recommended choice for lithium-ion fire risks. Compact aerosol versions are well suited to home and workshop use, while larger AVD extinguishers can replace an entire commercial fire point, handling the same risks covered by water and CO2 units as well as Class L lithium-ion fires.

Worth noting: neither type of li-ion extinguisher is suitable for electric car fires. The sheer quantity of extinguishing agent needed makes that a job for the fire service.

Electric Car Fire Blankets

For electric vehicles, the best option available is the Lithco Electric Vehicle Fire Blanket with Telescopic Poles. Rather than trying to extinguish an EV fire outright (which frankly isn’t realistic), the blanket is designed to contain it. It wraps around the vehicle to stop flames and molten debris spreading to nearby cars or structures, while simultaneously cutting off the oxygen supply to slow the fire’s progress.

These blankets are designed for use at car parks, charging stations, car ferries and by fire service personnel. They’re not an extinguishing tool, but a containment one, and that distinction matters enormously when dealing with a fire of this intensity. They should be used by trained personnel only.

Lithium-Ion Battery Storage Safes

Prevention, as ever, beats cure. The Lithium-Ion Battery Fire Protection Box is suitable for quarantining items, and is particularly useful for protection when transporting or storing goods. For larger items, we’d recommend the Premium Plus Storage and Charging Cabinet, which is both fire and explosion proof, ideal for protecting business assets.

If you’re regularly charging e-bikes, power tool batteries, or multiple devices in one location, dedicated battery storage is well worth considering.

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If your assessment doesn’t currently account for Class L hazards, now is a good time to revisit it. If you’re not sure what equipment you need, our team at Safelincs is on hand to help, just get in touch via live chat or give us a call.

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

What Is a Class A Fire and How Do You Put One Out?

Disclaimer: This guide is for general information only. It does not constitute professional fire safety advice. Always consult a qualified fire safety professional and follow the latest UK regulations, including the Regulatory Reform (Fire Safety) Order 2005, when assessing fire risks or selecting fire safety equipment.  

A class A fire is a fire involving solid combustible materials, such as wood, paper, textiles, cardboard or plastics. These are the most common types of fire in both domestic and commercial settings. The right extinguisher, used promptly and correctly, can bring a class A fire under control before it spreads. Browse suitable options in our foam fire extinguishers category.

Estimated reading time: 5 minutes

Key takeaways:

  • A class A fire involves solid combustible materials such as wood, paper, textiles and cardboard
  • Class A fires are the most common fire type in homes and workplaces
  • Water, water-mist, foam and dry powder extinguishers are all rated for use on class A fires
  • CO2 extinguishers are not suitable for class A fires
  • Class A fires can start and spread quickly if combustible materials are left near ignition sources
  • Reducing combustible material in a space is one of the most effective ways to lower class A fire risk
Red fire extinguisher mounted on a white wall

What materials are involved in a class A fire?

A class A fire involves solid combustible materials. Common examples include wood, paper, cardboard, textiles, rubber and some plastics. These materials turn up in virtually every environment, which is why class A fires are the most frequently occurring fire type in the UK. They’re common in homes, offices, schools, warehouses and retail premises. Any environment with a significant amount of combustible solid material carries a class A fire risk.

How does a class A fire differ from other fire classifications?

The UK uses the European fire classification system to categorise fires by the type of fuel involved. Class A covers solid combustible materials. Class B covers flammable liquids, class C covers flammable gases, class D covers combustible metals and class F covers cooking oils and fats. There is also a separate category for electrical fires. Class A is the broadest category and covers the widest range of everyday materials, which is why it accounts for the majority of fires attended by UK fire and rescue services.

Which fire extinguisher is best for a class A fire?

Water or water mist extinguishers are the most common choice for class A fires. They cool the burning material below its ignition temperature, which stops combustion and reduces the risk of re-ignition. Foam extinguishers also work well on class A fires by cooling the fuel and forming a barrier against oxygen. Dry powder extinguishers carry a class A rating too, but they leave residue and reduce visibility, so water or foam are usually the better option indoors. Always check the extinguisher’s label to confirm it carries a class A rating before use.

Can you use a CO2 extinguisher on a class A fire?

No. CO2 extinguishers are not suitable for class A fires. CO2 works by displacing oxygen, which can suppress a flame temporarily, but it doesn’t cool the burning material. Solid combustibles retain heat and can re-ignite once the CO2 disperses. For class A fires, you need an extinguisher that cools the fuel directly. Water is the most effective option for that.

Where do class A fires most commonly occur?

Class A fires can occur in almost any setting. They’re particularly common in homes, where soft furnishings, bedding, curtains and paper materials are widespread. In workplaces, offices, warehouses and retail environments carry a higher class A risk due to the volume of paper, packaging and stored goods. Outdoor fires involving garden waste, wooden structures or skips also fall into the class A category. Because combustible solids are so universal, class A fire risk is something every home and business needs to consider.

How do you prevent a class A fire?

Reducing combustible material and controlling ignition sources are the two most important steps. Keep flammable materials such as paper, cardboard and textiles away from heaters, cookers and open flames. Don’t let rubbish or waste accumulate, particularly near heat sources or electrical equipment. Make sure smoking only happens in designated areas away from combustible materials. Test smoke alarms regularly and ensure your premises has an appropriate extinguisher in place. In workplaces, a fire risk assessment is a legal requirement under the Regulatory Reform (Fire Safety) Order 2005.

Are class A fires dangerous?

Class A fires are dangerous and can spread quickly, particularly where large amounts of combustible material are present. Smoke from burning solids can be toxic and disorientating, and fast-spreading flames can make escape difficult. Early detection and a prompt response are critical. A working smoke alarm and a correctly rated extinguisher close to hand can make a real difference to the outcome.

We stock a full range of fire safety equipment at Safelincs. If you want to make sure you’re prepared, take a look at our P50 Water Mist fire extinguisher and browse our complete range to find the right extinguisher for you.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

What Is a Class B Fire and How Do You Put One Out?

Disclaimer: This guide is for general information only. It does not constitute professional fire safety advice. Always consult a qualified fire safety professional and follow the latest UK regulations, including the Regulatory Reform (Fire Safety) Order 2005, when assessing fire risks or selecting fire safety equipment.  

A class B fire is a fire involving flammable liquids, such as petrol, diesel, paint, solvents or methylated spirits. These fires are common in garages, workshops, industrial premises and anywhere flammable liquids are stored or used. The right extinguisher, used correctly, can suppress a class B fire effectively. You can browse suitable options in our CO2 fire extinguishers category.

Estimated reading time: 5 minutes

Key takeaways:

  • A class B fire involves flammable liquids such as petrol, diesel, paint and solvents
  • Class B fires are distinct from other fire classifications, which cover solids, gases and electrical hazards
  • CO2 and foam extinguishers are the most effective types for class B fires
  • Water extinguishers must never be used on a class B fire
  • Class B fires are most common in garages, workshops and industrial environments
  • Proper storage of flammable liquids is the most important step in preventing class B fires
Red fire extinguisher and hose cabinet mounted on a concrete wall

What does a class B fire contain?

A class B fire contains flammable liquids. Common examples include petrol, diesel, oil, paint, lacquers, solvents and methylated spirits. These liquids produce flammable vapours that ignite easily and burn intensely. Class B fires spread quickly, particularly if the burning liquid spills or flows to a new area. That’s what makes them so hazardous in garages, workshops and storage facilities.

How does a class B fire differ from other fire classifications?

The UK follows the European fire classification system, which categorises fires by the type of fuel involved. Class A covers solid combustible materials such as wood, paper and textiles. Class B is for flammable liquids. Class C covers flammable gases, class D covers combustible metals and class F covers cooking oils and fats. There is also a separate category for electrical fires. Getting the classification right matters, because the wrong extinguisher can spread a flammable liquid fire rather than suppress it.

Which fire extinguisher is best for a class B fire?

CO2 extinguishers and foam extinguishers are both well suited to class B fires. CO2 extinguishers work by displacing oxygen and smothering the fire without leaving residue. They’re a good choice for enclosed spaces and areas with sensitive equipment. Foam extinguishers work by forming a blanket over the burning liquid, cutting off the oxygen supply and preventing re-ignition. Both types carry a class B rating. Always check the extinguisher label before use to confirm it’s rated for flammable liquids.

Can you use a water extinguisher on a class B fire?

No. A water extinguisher must never be used on a class B fire. Water can cause burning liquid to splash and spread, making the fire considerably worse. It can also cause steam burns. Dry powder extinguishers can tackle class B fires in some circumstances, but they leave heavy residue and reduce visibility, so CO2 or foam are the better choices for most environments.

Where do class B fires most commonly occur?

Class B fires are most common wherever flammable liquids are stored, handled or used. That includes garages and vehicle workshops, fuel storage areas, paint stores, industrial manufacturing premises and laboratories. They can also occur in domestic settings, for example where petrol lawn mowers, paint tins or cleaning solvents are kept in a garage or outbuilding. Any space containing flammable liquids needs an appropriate extinguisher nearby.

How do you prevent a class B fire?

Good storage practice is the most effective way to prevent a class B fire. Store flammable liquids in clearly labelled, sealed containers designed for the purpose. Keep them in a cool, ventilated area away from ignition sources such as naked flames, sparks or hot surfaces. Don’t store more than you need. Clean up any spillages immediately and dispose of them safely. In commercial and industrial settings, follow the relevant COSHH regulations and make sure staff are trained in safe handling procedures.

Are class B fires dangerous?

Class B fires are among the most hazardous fire types. Flammable liquids burn at high temperatures, spread fast and produce toxic smoke. Because the fuel is liquid, the fire can flow to new areas quickly if it’s not contained. CO2 and foam extinguishers, used early and correctly, can prevent a small fire from becoming a serious one. But if a class B fire takes hold, evacuate immediately and call 999.

We stock a full range of fire safety equipment at Safelincs. If you want to make sure you’re covered, take a look at our Ultrafire 2kg CO2 fire extinguisher and browse our complete range to find the right extinguisher for your needs.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

What Is a Class C Fire and How Do You Put One Out?

Disclaimer: This guide is for general information only. It does not constitute professional fire safety advice. Always consult a qualified fire safety professional and follow the latest UK regulations, including the Regulatory Reform (Fire Safety) Order 2005, when assessing fire risks or selecting fire safety equipment.  

A class C fire is a fire involving flammable gases, such as methane, propane, butane or hydrogen. These fires are common in domestic, commercial and industrial environments where gas is present. The safest first step is to shut off the gas supply, if it’s safe to do so. You can find suitable extinguishers in our dry powder fire extinguishers category.

Estimated reading time: 5 minutes

Key takeaways:

  • A class C fire involves flammable gases such as methane, propane and butane
  • Class C fires are distinct from other fire classifications, which cover solids, liquids and electrical hazards
  • Isolating the gas supply is the priority before attempting to extinguish a class C fire
  • Dry powder extinguishers are the main extinguisher type used on class C fires
  • Water and foam extinguishers must never be used on class C fires
  • Preventing class C fires relies on regular maintenance of gas appliances and pipework
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What gases are involved in a class C fire?

Class C fires involve flammable gases. Common examples are methane, propane, butane, natural gas and hydrogen. These gases ignite easily and burn fast, which makes class C fires particularly hazardous. They can occur in homes with gas central heating or cooking appliances, in commercial kitchens or in industrial settings where gas cylinders are stored or used.

How does a class C fire differ from other fire classifications?

The UK follows the European fire classification system, which groups fires by fuel type. Class A covers solid materials such as wood, paper and textiles. Class B covers flammable liquids like petrol and paint. Class C is for flammable gases. There’s also class D for combustible metals, class F for cooking oils and fats, and a separate category for electrical fires. Knowing the classification matters. Use the wrong extinguisher and you could make things much worse.

What should you do if you encounter a class C fire?

Don’t try to extinguish a class C fire unless you’ve shut off the gas supply and received proper training. The gas has to stop flowing before the fire can be dealt with safely. If you can’t isolate the supply, evacuate, call 999 and keep everyone away. Sometimes it’s safer to let the fire burn in a controlled way rather than extinguish it. Putting out the flame without stopping the gas allows unburnt gas to build up, which creates an explosion risk.

Which fire extinguisher works on a class C fire?

Dry powder extinguishers are rated for use on class C fires. They interrupt the chemical reaction of combustion. But dry powder leaves residue that can damage equipment and reduce visibility, so it’s best suited to outdoor or industrial settings. Water mist extinguishers can also be effective in some gas fire scenarios, but only once the supply has been isolated. Always check the extinguisher’s rating label before use.

Can you use a water extinguisher on a class C fire?

No. Water extinguishers must never be used on a class C fire. Water won’t extinguish a gas fire and could cause burns from steam or scatter burning material. Foam extinguishers are equally unsuitable. Using the wrong extinguisher on a gas fire is dangerous and can make the situation considerably worse.

How do you prevent class C fires?

Prevention is your best tool. Have gas appliances and pipework checked regularly by a Gas Safe registered engineer. Install a gas detector where gas appliances are in use. Store gas cylinders upright, in a well-ventilated area and away from ignition sources. Don’t tamper with gas connections yourself. And if you smell gas, call the National Gas Emergency Service straight away on 0800 111 999.

Are class C fires common in the UK?

Class C fires occur regularly in the UK, particularly in homes where gas central heating and gas cookers are widespread. The Health and Safety Executive recognises gas-related incidents as among the most serious fire risks in both domestic and workplace settings. The right equipment and a prompt response can make a real difference.

We stock a full range of fire safety equipment at Safelincs. If you want to make sure you’re prepared, take a look at our 1kg dry powder fire extinguisher and browse the rest of our range today.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

How Do Water Fire Extinguishers Work?

Disclaimer: This guide provides general information about water fire extinguishers for educational purposes. Always consult a qualified fire safety professional for advice specific to your premises and ensure you receive proper training before operating any fire extinguisher.

Water fire extinguishers are designed to combat Class A fires by cooling burning materials below their ignition temperature. When you discharge a water fire extinguisher, it releases a stream or spray of water that absorbs heat from the flames and burning surfaces, removing the heat element from the fire triangle. This cooling action rapidly lowers the temperature of materials like wood, paper and textiles, extinguishing the fire and preventing reignition.

Estimated reading time: 7 minutes

Key Takeaways

  • Water fire extinguishers work by removing heat from fires through absorption and cooling.
  • They operate using a stored-pressure mechanism with compressed air or nitrogen as the propellant.
  • Water extinguishers are effective only on Class A fires involving solid combustible materials.
  • Fire ratings like 13A or 21A indicate the size of fire an extinguisher can tackle under test conditions.
  • These extinguishers should never be used on flammable liquids or cooking oil fires.
  • Water lowers the temperature of burning materials below the ignition point, breaking the fire triangle.

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What Is the Fire Triangle and How Do Water Extinguishers Disrupt It?

The fire triangle is a fundamental concept in fire safety that explains the three essential elements required for combustion. Heat, fuel and oxygen. Remove any one of these components, and the fire cannot sustain itself.

Water fire extinguishers work by attacking the heat element of the fire triangle. When water makes contact with burning materials, it absorbs tremendous amounts of thermal energy through two processes. Sensible heating occurs as the water temperature rises from ambient to boiling point. Then comes the latent heat of vaporisation, which happens when liquid water transforms into steam. This second process requires approximately 2,260 kilojoules per kilogram, making it exceptionally efficient at removing heat.

This dual absorption process is what makes water so effective at firefighting. As the temperature of the burning material drops below its ignition point, the chemical reactions that sustain combustion can no longer continue. The fire goes out.

Fire Triangle Element Role in Combustion How Water Extinguishers Affect It
Heat Provides energy to sustain combustion Water absorbs heat through sensible heating and the latent heat of vaporisation
Fuel Provides combustible material Water cools fuel below ignition temperature
Oxygen Supports chemical reactions Water creates some displacement, but primarily works through cooling
Fire Triangle Element
Heat
Role in Combustion
Provides energy to sustain combustion
How Water Extinguishers Affect It
Water absorbs heat through sensible heating and the latent heat of vaporisation
Fire Triangle Element
Fuel
Role in Combustion
Provides combustible material
How Water Extinguishers Affect It
Water cools fuel below ignition temperature
Fire Triangle Element
Oxygen
Role in Combustion
Supports chemical reactions
How Water Extinguishers Affect It
Water creates some displacement, but primarily works through cooling

How Does the Stored Pressure Mechanism Work in Water Fire Extinguishers?

Most modern water fire extinguishers in the UK are stored-pressure units. In this design, both the extinguishing agent (water) and the pressurising gas live together in the same cylinder. The pressurising gas is typically compressed air or nitrogen.

When you squeeze the handle of a stored-pressure extinguisher, you open the valve at the top of the cylinder. The compressed gas pushes down on the water, forcing it up through the siphon tube and out through the nozzle. This creates a continuous stream or spray of water directed at the fire.

The pressure inside stays constant throughout the discharge until the extinguisher is empty. You can check this pressure using the gauge mounted on the body. The indicator should show the unit is in the green ‘charged’ zone for the extinguisher to be ready for use.

Stored Pressure vs Cartridge-Operated Stored Pressure (Most Common): Agent and propellant stored together in one cylinder. The pressure gauge shows readiness. Nitrogen or air is used as a propellant.

Cartridge-Operated (Less Common): Agent and propellant stored separately. CO2 cartridge punctured when activated. No pressure gauge. Common in industrial settings.  

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What Do Fire Ratings Like 13A and 21A Mean?

Fire ratings on water extinguishers indicate the size and type of fire the unit can extinguish under controlled test conditions. The rating consists of a number followed by a letter. The number represents the fire size. The letter indicates the fire classification.

For Class A fires, test fires are created using a crib of wooden sticks measuring 500mm wide and 546mm high. The crib’s length determines the rating. A 13A rating means the extinguisher successfully extinguished a crib 1.3 metres long under test conditions. A 21A rating means it can tackle a 2.1 metre-long crib.

These tests follow BS EN3, the standard that governs fire extinguisher manufacture and performance in the UK and Europe. After an eight-minute pre-burn, a skilled operator must extinguish the entire test fire with no signs of reignition for at least three minutes. Rigorous testing ensures reliability.

Higher numbers indicate greater firefighting capability. If you need a 13A-rated extinguisher for your premises, a 21A-rated unit will provide even better protection. However, physical size and weight also increase with higher ratings, so there’s always a balance to strike.

Fire Rating Test Crib Length Typical Extinguisher Sizes
8A 0.8 metres 2 litre water mist
13A 1.3 metres 3 litres of water, 6 litres of water, 6 litres of water mist
21A 2.1 metres 6 litre water additive, 9 litre water
27A 2.7 metres 6 litre water additive with enhanced formula
Fire Rating
8A
Test Crib Length
0.8 metres
Typical Extinguisher Sizes
2 litre water mist
Fire Rating
13A
Test Crib Length
1.3 metres
Typical Extinguisher Sizes
3 litres of water, 6 litres of water, 6 litres of water mist
Fire Rating
21A
Test Crib Length
2.1 metres
Typical Extinguisher Sizes
6 litre water additive, 9 litre water
Fire Rating
27A
Test Crib Length
2.7 metres
Typical Extinguisher Sizes
6 litre water additive with enhanced formula

Which Types of Fires Can Water Fire Extinguishers Tackle?

Water fire extinguishers are designed exclusively for Class A fires. These involve ordinary combustible materials that produce ash when burned. Think wood, paper, cardboard, textiles, fabrics and most plastics.

In premises such as offices, schools, warehouses and hotels, Class A fires pose the most significant fire risk. This makes water extinguishers a practical and cost-effective choice for many buildings. They’re often paired with CO2 extinguishers to provide additional coverage for electrical equipment fires as well.

Water extinguishers excel at penetrating deep into burning materials. This allows them to tackle deep-seated fires where heat has penetrated below the surface. 

The water soaks into the material, cooling it throughout and preventing reignition from hot spots lurking beneath.

Some water extinguishers have passed the 35kV dielectric test specified in BS EN3. These units may be marked as suitable for use on live electrical equipment up to 1000V at a distance of one metre.

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When Should You Never Use a Water Fire Extinguisher?

Understanding the limitations of water fire extinguishers is as important as knowing their capabilities. You should never use a water fire extinguisher on:

Class B Fires (Flammable Liquids)

Water is denser than most flammable liquids, such as petrol, diesel or paint. It sinks below the liquid surface and fails to create an effective barrier. Worse, the water can cause the burning liquid to splash and spread, worsening the fire rather than extinguishing it.

Class C Fires (Flammable Gases)

Water is ineffective against gas fires. The primary danger with gas fires is the escaping gas itself. Extinguishing the flame without shutting off the gas supply creates an explosion risk as an invisible cloud of gas builds.

Class F Fires (Cooking Oils and Fats)

Water reacts violently with hot cooking oils. When water contacts oil heated above 340°C, it instantly vaporises into steam. This explosive expansion can spray burning oil in all directions, causing severe injuries and spreading the fire throughout the kitchen.

How Do You Operate a Water Fire Extinguisher Safely?

Operating a water fire extinguisher correctly can make the difference between successfully controlling a small fire and allowing it to spread. The standard method uses the PASS technique. It’s simple but effective.

1. Pull the safety pin or break the tamper seal. This unlocks the operating mechanism. Hold the extinguisher upright with the nozzle pointing away from you.

2. Aim the nozzle at the base of the flames, not at the top. Fires burn upwards, but the fuel is at the bottom. Attacking the base cuts off the fire’s fuel source.

3. Squeeze the handle slowly and steadily. This opens the valve and releases the water stream. You should stand at least two to three metres from the fire for safety.

4. Sweep the nozzle from side to side across the base of the fire. Continue sweeping until all visible flames are extinguished. Keep watching for several minutes after the fire is out in case reignition occurs from smouldering materials.

Always ensure you’ve got a clear escape route behind you before attempting to fight any fire. If the fire is larger than a waste paper bin, spreading rapidly, there’s heavy smoke or you feel unsafe, evacuate immediately and call 999. Your life is more valuable than any property.

What’s the Difference Between Water Jet and Water Mist Extinguishers?

Water jet extinguishers discharge a high-pressure stream of water. This stream can reach up to 10 metres, allowing you to fight fires from a safe distance. The powerful jet penetrates deep into burning materials, making it effective against deep-seated fires. However, the concentrated stream covers a smaller surface area at once.

Water mist extinguishers discharge water as a fine mist through a special nozzle. The mist rapidly covers a much larger surface area. This creates a more efficient cooling effect and reduces water damage compared to a jet. The mist also creates a partial barrier between you and the fire, offering better protection from radiant heat.2

How Do Water Mist Extinguishers Differ from Standard Water Extinguishers?

Water mist extinguishers represent an evolution in fire extinguisher technology. They discharge water as microscopic droplets, typically 10-100 microns in diameter. This creates dramatically more surface area compared to standard water streams.

The increased surface area means more efficient heat absorption. Water mist extinguishers can tackle Class A fires just as effectively as standard units, often with smaller capacities. Many water mist models also carry ratings for Class B and Class F fires, making them more versatile than their traditional counterparts.

The microscopic droplets have another crucial advantage. They don’t form a continuous conductive path for electricity. This allows water mist extinguishers to be used safely on live electrical equipment up to 1000V at a distance of 1 metre.

Water mist also causes less collateral damage. The fine droplets evaporate quickly rather than pooling on floors or soaking into furnishings. This makes water mist extinguishers ideal for offices, heritage buildings, museums and other locations where water damage would be costly or devastating to operations.

Why Choose Safelincs

Choosing the proper fire extinguisher for your premises is a critical safety decision that shouldn’t be rushed. At Safelincs, we offer a comprehensive range of water and water-mist fire extinguishers for every application, from small offices to large warehouses.

Our expert team can help you select the correct type and rating for your specific fire risks, ensuring you’re protected without overspending on unnecessary capacity.

We provide delivery, installation and commissioning services to ensure your fire protection meets UK regulations and gives you complete peace of mind. Contact our fire safety specialists today for personalised advice on selecting and placing water fire extinguishers.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

When Should a Flammables Store Be Used?

A flammable store is required when you store flammable liquids that exceed specific threshold quantities in your workplace. The Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) require flammable substances to be stored safely to prevent fire, explosion, and harm to people. Proper storage in flammable liquid cabinets helps you comply with these legal requirements and protects your workplace.

Estimated reading time: 5 minutes  

Key Takeaways

  • A flammables store is required when storing flammable liquids above specific quantities in the workplace.
  • DSEAR 2002 requires risk assessments and safe storage of all dangerous substances.
  • HSE guidance recommends 50 litres as a maximum for extremely flammable, highly flammable, and flammable liquids with a flashpoint below ambient temperature in workroom cabinets.
  • Your workplace type, substance classification and risk assessment determine specific storage needs.
  • Flammable stores must meet construction standards, be appropriately located, and be adequately ventilated

Disclaimer: This guide provides general information about flammable storage requirements in the UK. It doesn’t constitute legal or professional advice. Always consult relevant regulations, conduct proper risk assessments, and seek professional guidance for your specific circumstances.  

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What Are the Legal Requirements for Storing Flammable Liquids?

The primary legal requirement is compliance with DSEAR 2002. This requires you to eliminate or reduce the risks posed by dangerous substances. You must conduct a risk assessment, provide appropriate storage, ensure proper ventilation and put control measures in place.

The Health and Safety Executive (HSE) enforces these requirements and provides guidance on compliance. Failure to comply can result in prosecution and fines. More importantly, it can lead to serious consequences if an incident occurs.

DSEAR applies to nearly all workplaces and covers any substance that could cause fire or explosion. If you store petrol, solvents, paints or other flammable liquids, you need to follow these rules.

What Storage Thresholds Trigger the Need for a Flammables Store?

Storage thresholds vary depending on the flashpoint and quantity of your liquids. HSE guidance recommends that 50 litres is a maximum for extremely flammable, highly flammable, and flammable liquids with a flashpoint below ambient temperature when stored in workroom cabinets. For flammable liquids with a higher flashpoint (up to 60°C), the recommended maximum is 250 litres.

Understanding how substances are classified helps you determine your storage needs. Under the current GB CLP Regulation, flammable liquids are classified into three categories:

Classification Flashpoint Examples Storage Considerations
Category 1 Below 23°C and boiling point ≤35°C Diethyl ether, pentane Requires dedicated storage even in small quantities
Category 2 Below 23°C and boiling point >35°C Petrol, acetone, methanol, white spirit, and many solvents Dedicated storage recommended; maximum 50 litres in workroom cabinets
Category 3 23°C to 60°C Paraffin (kerosene), diesel, and some oils Storage requirements based on quantity and risk assessment; maximum 250 litres in workroom cabinets for those with flashpoint above ambient
Classification
Category 1
Flashpoint
Below 23°C and boiling point ≤35°C
Examples
Diethyl ether, pentane
Storage Considerations
Requires dedicated storage even in small quantities
Classification
Category 2
Flashpoint
Below 23°C and boiling point >35°C
Examples
Petrol, acetone, methanol, white spirit, and many solvents
Storage Considerations
Dedicated storage recommended; maximum 50 litres in workroom cabinets
Classification
Category 3
Flashpoint
23°C to 60°C
Examples
Paraffin (kerosene), diesel, and some oils
Storage Considerations
Storage requirements based on quantity and risk assessment; maximum 250 litres in workroom cabinets for those with flashpoint above ambient

(Note: The table above reflects current GB CLP classification. Older terminology such as “extremely flammable” and “highly flammable” may still be encountered but refers to the now-superseded CHIP Regulations.)

But that’s guidance, not a rigid rule. Your specific circumstances matter. The type of building, proximity to ignition sources and other factors all play a role.

Your risk assessment determines the appropriate storage method. It considers the specific substances, quantities and workplace conditions. Two workplaces storing the same liquid might need different solutions based on their circumstances.

Which Workplaces Need Flammables Stores?

Any workplace that stores flammable liquids, solvents, paints, adhesives, or chemicals in quantities above safe levels requires appropriate storage. Manufacturing facilities, workshops and laboratories are prominent examples. Maintenance areas, schools, hospitals and even retail environments might need them too.

Small offices aren’t exempt. Even small quantities in communal areas may require proper storage if your risk assessment identifies significant hazards. A cleaning cupboard full of spirit-based cleaners could pose a real risk.

The deciding factor isn’t your workplace type. It’s the substances you store and the risks they present. A school art department with litres of white spirit needs the same care as an industrial paint shop. Same substance, same risks.

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What Makes a Proper Flammables Store?

A proper flammables store is a cabinet constructed from steel with fire-resistant properties. It needs secure locking mechanisms to prevent unauthorised access. You don’t want untrained people handling dangerous substances.

The cabinet must provide spill containment capable of retaining 110% of the volume of the largest container stored inside. Flammable liquids that leak can spread quickly and create a significant hazard. Adequate ventilation prevents vapour accumulation inside the cabinet. The vapours are often more dangerous than the liquid itself.

Clear labelling matters. Everyone needs to know what’s inside and what hazards they’re dealing with. Position the cabinet away from ignition sources, escape routes, and high-traffic areas. You don’t want a flammables store blocking your fire exit or sitting next to a boiler.

Size and capacity should match your storage needs without encouraging overstocking beyond safe limits.

How Do COSHH Regulations Affect Flammable Storage?

The Control of Substances Hazardous to Health Regulations 2002 (COSHH) overlap with DSEAR requirements for many flammable substances. COSHH focuses on health risks from substances, while DSEAR focuses on fire and explosion risks. Many flammable liquids are covered by both sets of regulations.

You must assess the health risks posed by your substances and prevent or control exposure. That means maintaining your control measures and providing your staff with proper information and training. Not optional extras.

A flammable liquid that emits harmful vapours requires storage that addresses both concerns. Your cabinet must prevent fire risks under DSEAR and health risks under COSHH. That’s why proper ventilation is so important. It tackles both vapour accumulation and exposure in one go.

Need Help With Flammable Storage?

Choosing the proper storage solution can feel complicated. The regulations overlap, and your specific needs depend on many factors. Getting it right protects your people and your premises, though.

We’ve helped thousands of businesses find the right flammable storage solutions. Our team understands the regulations and can guide you through your options. Contact us for expert advice on keeping your workplace safe.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

Why is my smoke alarm beeping?

Key Takeaways

  • A continuous alarm may mean smoke, dust, dirt, damage or an alarm that’s passed its 10 year lifespan.
  • Intermittent beeping or chirping usually signals a low battery, and this is more common at night when temperatures drop.
  • Mains powered smoke alarms have backup batteries that can chirp when they run low.
  • You should replace smoke alarms every 10 years because the sensors deteriorate over time.
  • Placing your alarm in the wrong spot (near kitchens, bathrooms or draughty areas) can trigger false alarms.
  • We offer replacement options for discontinued models, often without needing an electrician.

Is your smoke alarm beeping in the night and keeping you awake? Or perhaps it’s disturbing your day? Whether you’ve got mains powered interlinked smoke alarms or battery powered ones, follow our guidance below to troubleshoot the beeping and get some peace back.

What Type of Sound Is Your Smoke Alarm Making?

Before you start troubleshooting, work out what type of sound your smoke alarm is making. This’ll help you pinpoint the cause and find the right fix.

Note: Beep patterns vary by manufacturer and model. Always check your alarm’s user manual for the specific meanings of different sounds.  

Sound Type Pattern Likely Cause Urgency
Continuous loud alarm Non-stop sounding Smoke or fire detected, dust or fault High: check for fire straight away
Intermittent chirping Single beep every 30 to 60 seconds Low battery Medium: replace battery soon
Rapid beeping Multiple quick beeps End of life warning or malfunction Medium: replace alarm
Sound Type
Continuous loud alarm
Pattern
Non-stop sounding
Likely Cause
Smoke or fire detected, dust or fault
Urgency
High: check for fire straight away
Sound Type
Intermittent chirping
Pattern
Single beep every 30 to 60 seconds
Likely Cause
Low battery
Urgency
Medium: replace battery soon
Sound Type
Rapid beeping
Pattern
Multiple quick beeps
Likely Cause
End of life warning or malfunction
Urgency
Medium: replace alarm
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Why Is My Smoke Alarm Sounding Continuously?

A smoke alarm that won’t stop sounding needs your attention straight away. Follow these steps to work out what’s going on.

First, check there’s no smoke or fire in your property.

If there’s no fire, look into these common causes:

Could it be another alarm? Make sure the beeping is definitely coming from your smoke alarm. Other alarms in your home, such as a carbon monoxide alarm or burglar alarm, could be making the noise.

Is dust or dirt setting it off? Give the alarm a clean if it’s dusty or dirty. Vacuum around the alarm or use a hairdryer on a cool setting to blow out any dust from the sensor chamber.

Has your smoke alarm reached its expiry date? Check the “replace by” or manufacture date on the back of your alarm. Smoke alarms last a maximum of 10 years. If the manufacturing date is approaching or past 10 years, it’s time for a new one. The sensors inside deteriorate after this point, making the alarm less effective at detecting fires.

Is your alarm in the wrong spot? Different sensor types work best in different locations. An optical smoke alarm in a kitchen, for example, may go off from cooking fumes.

Could the alarm be damaged or faulty? Water, fire, grease and certain paints can all cause faults. If you think there’s damage, replace your smoke alarm straight away to keep your home and family safe.  

Why Is My Battery Smoke Alarm Chirping Intermittently?

An intermittent chirp or beep (typically once every 30 to 60 seconds) almost always means a low battery. Here’s what to do.

Replace the battery. Make sure you’re using the right battery type and inserting it the right way round. A low battery is more likely to sound at night because a drop in room temperature reduces its ability to power the alarm.

Check how old your alarm is. Smoke alarms last a maximum of 10 years. If the manufacturing date on yours is approaching or past 10 years, it’s time for a replacement. Even with a fresh battery, an old alarm may chirp because the sensors are wearing out.

Look for signs of damage. Water, fire, grease and certain paints can cause faults. If you suspect a problem, replace your smoke alarm straight away.  

Smoke Alarm Battery Types and Lifespan
Battery Type Typical Lifespan When To Replace
Alkaline 9V (PP3) 12 to 18 months We recommend annually, or every 6 months for maximum safety
Alkaline AA 12 to 18 months We recommend annually
Lithium 9V Up to 5 years When it starts chirping
Sealed lithium (10 year) 10 years Replace the entire alarm
Battery Type
Alkaline 9V (PP3)
Typical Lifespan
12 to 18 months
When To Replace
We recommend annually, or every 6 months for maximum safety
Battery Type
Alkaline AA
Typical Lifespan
12 to 18 months
When To Replace
We recommend annually
Battery Type
Lithium 9V
Typical Lifespan
Up to 5 years
When To Replace
When it starts chirping
Battery Type
Sealed lithium (10 year)
Typical Lifespan
10 years
When To Replace
Replace the entire alarm

Buy replacement smoke alarm batteries so your family gets alerted if there’s ever a fire in your home.

Why Is My Mains Powered Smoke Alarm Chirping Intermittently?

All new or recently extended homes should have mains powered interlinked alarms fitted. These also contain a backup battery to keep you protected during power cuts. Some makes/models contain replaceable batteries, whereas some have sealed batteries which cannot be replaced. Please check your user manual for more information.

The most common cause of chirping in mains powered alarms is a low backup battery.

Even though your alarm connects to the mains electricity, you’ll still need to replace the backup battery from time to time. Here’s how to stop the chirping:

  • Locate the battery compartment (usually by twisting the alarm off its base)
  • Replace the backup battery with the correct type for your alarm
  • Press the test button to check it’s working

If your alarm keeps chirping after you’ve replaced the backup battery, it may have reached the end of its 10 year lifespan and need replacing altogether.

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What Replacement Batteries Do Smoke Alarms Need?

Smoke alarms typically need one of these battery types:

  • Alkaline AA batteries (usually two)
  • Alkaline 9V battery (PP3)
  • Lithium 9V battery (lasts longer)

Check the label on your smoke alarm or look in the user manual to confirm the right type. Using the wrong battery can cause problems or void your warranty.

How Do I Replace a Mains Powered Smoke Alarm?

You should replace smoke alarms after 10 years, whether they’re mains powered or battery powered. The sensors deteriorate over time. Battery alarms are easy to swap out, but what about mains powered ones?

Good news: you can replace most mains powered alarms without calling an electrician if you buy the exact same model (if it’s still available) or an Easichange® replacement.

Learn why you should replace smoke alarms after 10 years.  

What If My Smoke Alarm Model Has Been Discontinued?

Need a replacement but can’t find your model anymore? We offer a dedicated collection of replacement smoke and heat alarms. We’ve chosen these specifically to be the simplest, most direct replacements, and you can often fit them without needing an electrician.

How Can I Prevent False Alarms?

The sensor type in your alarm determines where you should put it. False alarms often happen because the wrong alarm type is too close to a steamy, dusty or smoky area.

Where Should Different Smoke Alarm Types Go?
Alarm Type Best Locations Keep Away From
Heat alarms Kitchens, garages, dusty workshops Bedrooms, hallways (use smoke alarms there instead)
Optical smoke alarms Bedrooms, living rooms, hallways Kitchens, bathrooms, garages
Ionisation smoke alarms (discontinued) Landings, hallways Areas near kitchens or bathrooms
Alarm Type
Heat alarms
Best Locations
Kitchens, garages, dusty workshops
Keep Away From
Bedrooms, hallways (use smoke alarms there instead)
Alarm Type
Optical smoke alarms
Best Locations
Bedrooms, living rooms, hallways
Keep Away From
Kitchens, bathrooms, garages
Alarm Type
Ionisation smoke alarms (discontinued)
Best Locations
Landings, hallways
Keep Away From
Areas near kitchens or bathrooms

Spots to Avoid When Fitting Smoke Alarms

To prevent false alarms or poor performance, don’t fit alarms in these spots:

  • Next to doors, windows, air vents or fans that create a draught
  • Outside or in unheated spaces
  • Anywhere curtains or furniture would block the airflow
  • Steamy or humid rooms like shower rooms
  • In kitchens (use a heat alarm instead of a smoke alarm)

Find out which smoke alarm works best in each room.  

Quick Troubleshooting Summary
Problem What To Do
Continuous alarm with no fire Clean the alarm, check its position or replace it if it’s over 10 years old
Intermittent chirping (battery alarm) Replace the battery straight away
Intermittent chirping (mains alarm) Replace the backup battery – if your unit has a replaceable battery inside.
Alarm over 10 years old Replace the whole unit
Frequent false alarms Check where it’s positioned and consider a different alarm type
Discontinued alarm needs replacing Use an Easichange® or compatible replacement
Problem
Continuous alarm with no fire
What To Do
Clean the alarm, check its position or replace it if it’s over 10 years old
Problem
Intermittent chirping (battery alarm)
What To Do
Replace the battery straight away
Problem
Intermittent chirping (mains alarm)
What To Do
Replace the backup battery – if your unit has a replaceable battery inside.
Problem
Alarm over 10 years old
What To Do
Replace the whole unit
Problem
Frequent false alarms
What To Do
Check where it’s positioned and consider a different alarm type
Problem
Discontinued alarm needs replacing
What To Do
Use an Easichange® or compatible replacement

Don’t wait to change or replace a faulty smoke alarm. It’s one of the most important things you can do to keep your home and family safe. If you need any help, call our customer service team on 0800 612 6537 or email us.

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026

How to Control a Flammable Liquid Fire

Key Takeaways

  • Flammable liquid fires (Class B) involve petrol, diesel, oils, paints and alcohol, and can ignite from a single spark or open flame.
  • Never use water on a flammable liquid fire, as it can spread the flames and cause dangerous reactions.
  • Foam, CO2 and dry powder extinguishers are the three effective options for tackling Class B fires.
  • The PASS technique (Pull, Aim, Squeeze, Sweep) is the universal method for operating fire extinguishers safely.
  • Only fight flammable liquid fires if they’re small, contained and you have a clear escape route.
  • Prevention through proper storage and keeping flammable liquids away from ignition sources is your best defence.

When petrol, paint thinners or oils catch fire, you’re facing one of the most dangerous and fast-spreading fire types. Flammable liquid fires can escalate in seconds. Using the wrong approach can make things far worse. If you’ve ever wondered what you’d do if faced with burning fuel or oil, you’re not alone. Knowing how to control these fires safely could save lives and property.  

Understanding Flammable Liquid Fires (Class B)

In the UK, fires involving flammable liquids are classified as Class B fires. These include petrol, diesel, oils, alcohol, paraffin, certain paints and some solvents. What makes these fires so hazardous is their ability to spread rapidly and produce intense heat.

These liquids have low flash points. This means they can ignite from a single spark or open flame. Think about why you see “No Smoking” signs at petrol stations. The danger comes from the open flame of a lighter or match used to light a cigarette, which can ignite flammable vapours in the surrounding air.

Flammable liquids can quickly vaporise when burning, mixing with oxygen in the air to create an even greater fire hazard. The fire doesn’t just burn on the surface. The vapours themselves become fuel, which is why these fires can seem to “jump” or spread so quickly.

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Why Water is Your Enemy With Flammable Liquid Fires

Here’s something you need to know: never, ever use water on a flammable liquid fire.

When water comes into contact with burning oil or fuel, it vaporises into steam. This spits out the burning liquid, intensifying the fire. Remember your school science lessons? Oil and water don’t mix. Water is denser than most flammable liquids, so it sinks beneath them, then rapidly turns to steam. This creates an explosive ball of flames that spreads the fire further.

Using water on a Class B fire isn’t just ineffective; it’s dangerous. It’s risky and can turn a manageable situation into a life-threatening emergency.

Choosing The Right Fire Extinguisher For Flammable Liquids

For tackling Class B fires safely, you’ve got three effective options. Each works differently. Understanding these differences helps you make the right choice for your environment.

Foam Extinguishers (Cream Label)

Foam extinguishers work by creating a barrier over the surface of the flammable liquid, cutting off its oxygen supply and cooling the fire. They’re effective for contained liquid fires: think of fuel in a container or a spill that hasn’t spread.

Foam provides lasting protection and can even be applied to liquids in tanks to shield them from ignition from other sources. However, they’re not suitable for free-flowing or “running” liquid fires.

CO2 Extinguishers (Black Label) 

Carbon dioxide extinguishers displace oxygen, suffocating the fire. They’re brilliant because they leave no residue, making them ideal for areas with sensitive equipment. They’re also safe to use on electrical fires, making them a versatile choice.

One important note: the nozzle of a CO2 extinguisher becomes very cold during discharge and can cause frost burns. Never touch it with your bare hands. Always hold the extinguisher by the handle.

Dry powder extinguishers (blue label)

Powder extinguishers are multipurpose units that can tackle Class A, B and C fires. They’re effective for uncontained or “spill” fires where liquid is running.

However, they create visibility issues due to the fine powder cloud, and they don’t cool the fire. This means reignition is possible. They’re generally not recommended for indoor use unless necessary.

You can explore the full range of fire extinguishers suitable for your needs to ensure you’re appropriately protected.  

How to Control a Flammable Liquid Fire: The PASS Technique

When using any fire extinguisher, the PASS technique is your essential guide: Pull, Aim, Squeeze, and Sweep. This method works for all extinguisher types and helps you remember the steps when you’re under stress.

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Step 1: Pull The Safety Pin

Pull out the pin from the top of the extinguisher. This may require a slight twisting action as well as pulling. This safety pin prevents accidental discharge, so removing it activates the extinguisher and allows you to use the trigger.

2

Step 2: Aim at The Base

Aim the nozzle or horn of the extinguisher at the base of the flames, not at the fire itself. This is crucial because the base is where the fuel is burning. If you aim higher up at the fire, you’re wasting your extinguishing agent and won’t put it out effectively.

For flammable liquid fires, maintain a safe distance. Approximately two to three metres is a general guideline, though this may vary depending on the extinguisher type. This protects you from the heat and any potential splashing or spreading of the burning liquid.

3

Step 3: Squeeze The Handle

Firmly squeeze the trigger or handle to discharge the extinguishing agent, applying steady, even pressure to maintain a continuous, controlled flow. Don’t pump it or squeeze intermittently. You want a consistent stream.

4

Step 4: Sweep Across The Fire

Sweep the nozzle from side to side across the base of the fire, covering the entire burning area with the extinguishing agent. Continue this sweeping motion until the flames are fully extinguished, and don’t stop until the extinguisher is empty. This helps prevent reignition.

Note that with oil and fat fires, you should avoid the standard PASS technique as the force can spread the burning liquid. For cooking oil fires, a wet chemical extinguisher or fire blanket is more appropriate.

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What You Need to Check Before You Fight The Fire

Before you even reach for an extinguisher, assess whether it’s safe to fight the fire. Here’s your mental checklist:

Only attempt to fight a flammable liquid fire if

  • The fire is small and contained (no larger than a waste bin).
  • You have the correct type of extinguisher for Class B fires.
  • You have a clear escape route behind you with no smoke, flames or heat blocking your exit.
  • The fire service has been called.
  • You feel confident and have received proper training.

You must have an established evacuation path. Ensure that no fire, smoke or heat obstructs your escape route. Your safety always comes first.

If the fire is spreading rapidly, producing thick smoke, or if you have any doubt about your ability to extinguish it, evacuate and leave it to the professionals. There’s no shame in getting out. It’s the wise decision.

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When Flammable Liquid Fires Are Too Dangerous to Fight

Fire extinguishers should only be used for small fires that you’re confident you can handle yourself. Some situations demand evacuation:

  • The fire is larger than you are.
  • Flames are spreading to other materials or areas.
  • Thick smoke is filling the room.
  • You can hear crackling or explosive sounds.
  • The heat is intense, even from several metres away.
  • Multiple containers of flammable liquids are nearby.
  • You don’t have the correct type of extinguisher.

In these scenarios, sound the fire alarm, evacuate everyone, close doors behind you (but don’t lock them) and call 999 once you’re safely outside.

Preventing Flammable Liquid Fires in The First Place

Of course, the best way to control a flammable liquid fire is to prevent one from starting. Here’s how you can seriously reduce your risk:

Storage Matters

Store all flammable liquids safely in appropriate containers, well away from any ignition sources such as heaters, electrical equipment or open flames. Purpose-built flammable liquid storage cabinets create a temporary barrier between a potential fire and the contents, buying time for evacuation.

Control Ignition Sources

Keep flammable liquids away from sparks, hot surfaces, smoking areas and any equipment that could generate heat. In garages and workshops, this means proper separation and clear signage.

Ventilation is Vital

Flammable liquid vapours can accumulate in poorly ventilated spaces, creating an invisible fire hazard. Ensure adequate airflow wherever you store or use these materials.

Regular Inspections

Check containers for leaks, damage or deterioration. A small leak today could be a significant fire hazard tomorrow.

Proper Training

Everyone who handles flammable liquids should receive training on safe handling, storage and emergency response procedures.

Ensuring Your Fire Safety Equipment Is Ready

Having the correct fire extinguishers is only half the battle. They need to be adequately maintained and serviced so they work when you need them most. The Regulatory Reform (Fire Safety) Order 2005 requires fire safety equipment to be kept in good working order.

Professional fire extinguisher servicing ensures your equipment will function correctly in an emergency. Annual servicing checks pressure, examines seals, tests discharge mechanisms, and verifies that each extinguisher is suitable for the fire risks at its location.  

Your Next Steps For Flammable Liquid Fire Safety

Controlling a flammable liquid fire safely requires the proper knowledge, the correct equipment and an honest assessment of the situation. Remember: foam, CO2, or dry powder extinguishers only, never water. Use the PASS technique, aim at the base and always prioritise your escape route.

But more importantly, invest in prevention. Proper storage, regular inspections and appropriate fire safety equipment create layers of protection that can stop fires before they start.

Need expert guidance on fire safety for your premises, or unsure which fire extinguishers you need? Our team is ready to help you today. Get in touch with us for personalised advice on protecting your property and people from flammable liquid fires.  

Mel Saunders

Head of Marketing

With over 20 years of experience in content writing, design and marketing, Mel now heads up the Content & Marketing Team at Safelincs. Having been in the fire safety industry for over 5 years, Mel has now developed a deep understanding of some of the critical issues facing the industry. Alongside her team, she aims to support the public with resources and information to help them improve fire safety at home, in the workplace or in 3rd sector organisations.

Latest Posts by Mel Saunders

Ceasefire MultiMax L-Ion Gains BSI Compliance Certification17th September 2026
Electrical Fire Safety Guide15th July 2026
What Is A Class D Fire?14th May 2026