Water Mist Fire Extinguishers

The difference between water mist fire extinguishers and standard water extinguishers

Water mist technology transforms ordinary water into microscopic droplets, creating a much larger surface area for heat absorption. This means faster cooling, better penetration into fire zones, and reduced water damage compared to conventional water extinguishers. The fine mist also creates a steam barrier that helps displace oxygen around the fire.

Which fire classes can water mist extinguishers handle?

Water mist extinguishers are designed for Class A fires involving wood, paper, textiles and other ordinary combustible materials. Many models also handle small Class F fires from cooking oils and fats, making them particularly valuable for domestic use and on small chip fryers in your home. Water mist extinguishers are suitable for use on fires involving live electrical equipment. Always check the specific rating on each extinguisher to confirm its approved fire classes.

How do water mist extinguishers work more effectively than traditional water types?

The secret lies in the droplet size. Water mist extinguishers produce droplets between 10 and 100 microns, compared to standard water extinguishers that create much larger droplets. These tiny particles vaporise quickly when they come into contact with flames, creating steam that displaces oxygen. The larger surface area also means more efficient heat absorption and faster fire suppression.

Are water mist extinguishers safe to use around electrical equipment?

Water mist extinguishers are suitable for use on live electrical equipment in accordance with BS EN3. For more information, refer to our guide to the use of water-based extinguishers on live electrical equipment.

What environments benefit most from water mist fire extinguishers?

Water mist extinguishers excel in environments where traditional water extinguishers would create excessive damage. They're perfect for offices, retail spaces, hotels, schools and any other location where effective fire suppression is needed without flooding. The reduced water usage means less cleanup and a lower risk of water damage to sensitive equipment or stock. The fact that they are completely non-toxic and contain only de-ionised water means they are also ideal in situations where there may be vulnerable individuals or near food preparation areas.

The average coverage of water mist extinguishers

Coverage depends on the size and model of the extinguisher. The 1.4ltr extinguisher has a 5A rating, making it suitable for homes, caravans or boats. Larger 3ltr and 6ltr water mist extinguishers can handle significantly bigger fires and cover larger areas. The fine mist also penetrates better into confined spaces and around obstacles.

Do water mist extinguishers need special maintenance?

Water mist extinguishers require the same basic maintenance as other water-based fire extinguishers. This includes annual servicing by a qualified technician, regular visual inspections, and monthly checks of pressure gauges. The advanced nozzle technology may need specific attention during servicing to ensure the mist pattern remains effective.

Can water mist extinguishers be used in freezing conditions?

Standard water mist extinguishers can freeze in temperatures below 0°C, which will prevent them from working. Always store water mist extinguishers in heated areas where possible to maintain their effectiveness.

What sizes and capacities are available?

Water mist extinguishers come in various sizes to suit different applications. Standard sizes include 1.4ltr for small spaces, 3ltr for medium areas, and 6ltr for larger commercial environments. The capacity affects both the fire rating and the duration of discharge, so choose based on your specific risk assessment needs.

A comparison of running costs with other extinguisher types

Water mist extinguishers are more expensive than most other types because of the different nozzle and technology involved.

There are no harmful chemicals to dispose of, and the reduced water usage means lower cleanup costs after use.

P50 Service-Free Water Mist Extinguishers are cost-effective as they do not require annual servicing from an external technician for 10 years.

Explore our comprehensive range of water mist fire extinguishers, specifically designed to meet modern fire safety requirements. Each unit combines proven water suppression technology with advanced mist delivery systems to effectively protect your personnel and property. Browse our selection today and find the perfect water fire extinguisher solution tailored to your specific needs.

Frequently Asked Questions (FAQs)

Can water mist extinguishers be used on live electrical equipment?

Yes, water mist extinguishers are safe to use on live electrical equipment. These units have been tested up to 35,000 volts and contain only de-ionised water, which does not conduct electricity. This makes them incredibly versatile for modern environments where electrical hazards are common. Unlike traditional water extinguishers, the microscopic water droplets won't cause short circuits or electrical damage. However, always turn off electrical equipment when possible for maximum safety.

Why are water mist extinguishers better than traditional water extinguishers for cooking oil fires?

Water mist extinguishers operate differently in cooking oil fires compared to traditional water extinguishers. Traditional water extinguishers deliver a jet of water that penetrates the surface of the burning fat, sinks because it is heavier than fat, and almost instantly evaporates. This rapid expansion pushes the burning fat out of the pan or deep fat fryer, creating violent flames and spreading the fire. Water mist extinguishers create a cooling blanket above the oil, reducing oxygen and preventing re-ignition without disturbing the burning surface. They're perfect for small cooking fires, but larger commercial fryers still require wet chemical extinguishers.

Are water mist extinguishers safe to use on people if their clothing catches fire?

Water mist extinguishers are exceptionally safe for clothing fires. The discharge of the water mist extinguisher is at low pressure and not harmful; the water itself is, of course, completely harmless. They extinguish clothing fires immediately and cool the affected area without causing harm to burns or the person. This makes them ideal for schools, nurseries, and other settings where vulnerable individuals are present. The fine mist won't cause the shock or injury that a high-pressure water jet might.

What makes water mist extinguishers environmentally friendly?

Water mist fire extinguishers contain only de-ionised water, meaning that no chemicals are released into the environment on discharge. This makes water mist extinguishers a sustainable and eco-friendly option. They leave no residue when discharged and contain no harmful substances. This is particularly important as AFFF foam extinguishers face international restrictions due to environmental concerns. You get effective fire suppression without compromising ecological responsibility.

How do water mist extinguishers create their fire suppression effect?

The supersonic nozzle design of these extinguishers generates a mist curtain that diminishes the oxygen supply fuelling the fire, thus extinguishing the flames. Additionally, it forms a highly efficient cooling layer over the burning material, effectively preventing re-ignition. The microscopic water droplets create a much larger surface area than traditional water streams, allowing for faster heat absorption and more efficient fire suppression. This dual action of oxygen displacement and rapid cooling makes them incredibly effective against multiple fire types.

For specialized applications, read about how our water mist extinguishers have been used to protect Ukraine's historic buildings. For low-maintenance solutions, consider the P50 water mist service-free extinguisher that reduces ongoing maintenance costs.