Heat Alarms

Temperature-based detection provides reliable fire protection where smoke alarms struggle. Heat alarms respond to rising temperatures rather than airborne particles, making them perfect for areas where dust, steam or cooking fumes would trigger false alarms.

Read more about heat alarms...

Temperature Detection Technology

Fixed temperature sensors activate when ambient temperature reaches a predetermined threshold, typically around 58°C. This reliable trigger point indicates genuine fire conditions and avoids false alarms from normal temperature variations.

Rate-of-rise detection responds to rapid temperature increases that signal developing fires. These sensors activate when temperature climbs faster than normal environmental conditions would explain, providing early fire warning.

Combination sensors incorporate both fixed temperature and rate-of-rise detection for enhanced reliability. This dual approach ensures activation under various fire development scenarios and maintains false alarm resistance.

Thermal detection remains unaffected by airborne contaminants that can compromise smoke sensors. Dust, cooking vapours, and chemical fumes don't interfere with heat alarm operation, ensuring consistent protection.

Ideal Installation Locations

Kitchen environments benefit enormously from heat detection. Cooking produces smoke and steam that would constantly trigger smoke alarms, making heat detectors the preferred choice for reliable fire protection.

Garage spaces often contain dust, vehicle exhaust, and chemical vapours that interfere with smoke detection. Heat alarms provide dependable protection without nuisance activations from these environmental factors.

Utility rooms housing boilers, water heaters, and laundry equipment generate steam and humidity that can affect smoke sensors. Heat detection offers reliable protection in these challenging environments.

Loft spaces accumulate dust and experience temperature variations that can cause false alarms with smoke detectors. Heat sensors provide appropriate fire protection for these storage areas.

Professional Applications

Commercial kitchens require heat detection to meet fire safety regulations while avoiding disruption from normal cooking operations. These environments demand reliable protection that won't interfere with business activities.

Industrial facilities use heat detection in areas where smoke sensors would be impractical. Manufacturing processes often generate particles or vapours that would cause constant false alarms with alternative detection methods.

Car parks and loading bays benefit from heat detection that remains reliable despite vehicle exhaust and environmental contaminants. These areas require protection that functions consistently in challenging conditions.

Product Options

The UltraFire UBH1 operates on two AA batteries and provides reliable heat detection with our exclusive 5-year warranty. This economical solution offers dependable protection for domestic applications.

Sealed battery heat alarms reduce ongoing maintenance requirements. The UltraFire ULLH10 features a 10-year lithium battery that never needs replacement throughout the alarm's operational life.

Mains-powered heat detectors suit permanent installations requiring maximum reliability. These units incorporate battery backup to maintain protection during power outages and provide consistent operation.

Radio-interlinked heat alarms connect wirelessly with smoke detectors to create comprehensive protection networks. The UltraFire ULLH10RF combines heat detection with wireless connectivity for enhanced safety coverage.

Our complete heat alarm range includes solutions for domestic applications. Professional guidance ensures you select appropriate detection methods for specific environmental challenges.

For comprehensive fire protection strategies, explore our complete alarm systems that combine smoke and heat detection for optimal safety coverage.

Choose temperature-based protection where traditional smoke detection falls short. Browse our heat detector selection and secure reliable fire protection for challenging environments.

Frequently Asked Questions (FAQs)

What is the difference between a heat detector and smoke alarm?

A heat detector responds to temperature increases rather than smoke particles, making it ideal for kitchens and dusty areas where smoke alarms would produce false activations.

At what temperature do heat alarms activate?

Heat alarms typically activate at around 58°C fixed temperature or when temperature rises rapidly, indicating fire conditions rather than normal environmental temperature changes.

Can heat detectors be used instead of smoke alarms everywhere?

Heat detectors cannot replace smoke alarms in bedrooms and living areas because they respond more slowly to fires, potentially providing insufficient warning time for safe evacuation.

Do heat alarms work in cold environments?

Heat alarms function reliably in cold environments and are actually less affected by low temperature extremes than some smoke detection technologies, maintaining consistent protection capabilities.

Filter List Grid
Group of four round white smoke and heat alarms from the radio interlinked sealed battery 3 smoke alarms 1 heat alarm kit

Radio-Interlinked Sealed Battery 3 Smoke and 1 Heat Alarm Kit - Hispec RF10-PRO Range

See Description...
  • Battery: 10 year sealed lithium battery
  • Warranty: 5 year warranty
  • Wirelessly interlink up to 20 Hispec RF10-PRO devices
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Compatible with the Hispec Control Unit and Carbon Monoxide Alarm
  • Also suitable for the 2022 Scottish legislation
4.7 out of 5 stars
£121.33 inc VAT

£93.29 inc VAT

£77.74 ex VAT

View Product

Fifhn450Bb Firehawk Fnh450Bb Mains Replacement Alkaline Battery Heat Alarm with packaging screws and batteries shown

Mains Powered Heat Alarm with Alkaline Back-up Battery - Firehawk FHN450BB

See Description...

This Firehawk FHN450BB mains powered heat alarm features replaceable alkaline battery backup, and interlinks with other 250BB/RB smoke and 450BB/RB heat alarms in the FHN range.

  • 230V mains with AAA alkaline battery backup
  • 6 years manufacturer's warranty
  • Hardwire interlink up to 12 Firehawk FHN smoke and heat alarms
  • UKCA marked, CE marked, and Kitemarked
  • Also suitable for both the Welsh and Scottish 2022 legislation
5 out of 5 stars

£20.09 inc VAT

£16.74 ex VAT

View Product

Box packaging and components of the Fifhn450Rb Firehawk Fnh450Rb Mains Sealed Lithium Battery Heat Alarm Contents displayed

Mains Heat Alarm with Sealed Self-Charging Lithium Battery Backup - Firehawk FHN450RB

See Description...
  • Power: 230V mains powered with back-up battery
  • Back-up Battery: sealed self-charging lithium battery
  • Warranty: 10 year warranty
  • Interlinks with up to 15 Firehawk FHN250 and FHN450 alarms
  • Combined test and silence button
  • Fast-Fix bases for easy installations
  • Suitable for BS 5839-6: 2019 Grade D1
  • Kitemarked to BS 5446-2: 2003
  • Also suitable for both the Welsh and Scottish 2022 legislation
Customer Reviews

£37.08 inc VAT

£30.90 ex VAT

View Product

Front view of the fireangel pro connected fp1720w2 r heat alarm showing its circular design and central sensor area

10 Year Longlife Battery Radio-Interlinked Heat Alarm - FireAngel Pro Connected FP1720W2-R

See Description...
  • Battery: Built-in, lasts the lifetime of your alarm – GUARANTEED
  • Warranty: 5 year warranty
  • Can interlink with up to 50 Wi-Safe 2 compatible devices
  • Large central button for test, hush and locate
  • Range of up to 35m in buildings
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Kitemarked to BS 5446-2: 2003
  • Also suitable for the 2022 Scottish legislation
4.6 out of 5 stars

£66.14 inc VAT

£55.12 ex VAT

View Product

ei mains powered with ei168rc radio interlink showing alarm base and boxes with product packaging visible

Mains Radio-Interlinked Heat Alarm with Alkaline Back-up Battery - Aico Ei144eRF

See Description...
  • Power: 230V mains powered with back-up battery
  • Backup Battery: 9V alkaline back-up battery (included)
  • Warranty: 5 year warranty
  • Test and hush buttons
  • Made in Ireland by Ei Electronics
  • Wirelessly interlinks with up to 12 compatible units
  • Suitable for BS 5839-6: 2019 Grade D2
  • Kitemarked to BS 5446-2: 2003
  • Also suitable for both the Welsh and Scottish 2022 legislation
5 out of 5 stars
£123.55 inc VAT

£112.34 inc VAT

£93.62 ex VAT

View Product

Front view of aico mains powered heat alarm self charging 10yr battery backup showing circular white design and central button

Mains Radio-Interlinked Heat Alarm with Self-Charging 10 Year Back-up Battery - Aico Ei3014RF

See Description...
  • 230V mains powered heat alarm with rechargeable lithium backup battery
  • Supplied with SmartLINK module for radio-interlinking with up to 12 devices
  • CE and Kitemarked to BS 5446-2: 2003
  • Suitable for BS 5839-6: 2019 Grade D1 installations
  • Contains AudioLINK allowing users to extract real time data to their phone
  • 5 year manufacturer's warranty
  • Also suitable for the 2022 Scottish legislation
Customer Reviews

£124.42 inc VAT

£103.68 ex VAT

View Product

aico mains powered combined smoke heat alarm with ei3000mrf boxes showing product packaging in white and red colors

Mains Radio-Interlinked Combined Smoke and Heat Alarm with Self-Charging 10 Year Back-up Battery - Aico Ei3024RF

See Description...
  • Power: 230V mains powered with back-up battery
  • Backup Battery: Self-charging battery
  • Warranty: 5 year warranty
  • Combined alarm: both an optical smoke, and heat sensor
  • Hybrid interlinking with up to 12 compatible devices
  • AudioLINK - extract real time data to your smart phone
  • Kitemarked to BS EN 14604: 2005 (smoke)
  • Kitemarked to BS 5446-2: 2003 (heat)
  • Also suitable for both the Welsh and Scottish 2022 legislation
5 out of 5 stars
£138.82 inc VAT

£126.00 inc VAT

£105.00 ex VAT

View Product

aico combined mains powered heat carbon monoxide alarm with ei3000mrf SmartLINK module boxes shown together

Mains Radio-Interlinked Combined Heat and Carbon Monoxide Alarm with Self-Charging 10 Year Back-up - Aico Ei3028RF

See Description...
  • Product Lifespan: 10 years
  • Power: 230V mains powered with battery backup
  • Backup Battery: Re-chargeable lithium battery
  • Warranty: 5 year warranty
  • Contains both a heat and electrochemical CO sensor
  • Can interlink with up to 12 devices via SmartLINK
  • Kitemarked to BS 5446-2:2003 (heat)
  • Kitemarked to BS 50291-1:2010 (CO gas)
  • Suitable for ceiling installation
  • Also suitable for both the Welsh and Scottish 2022 legislation
Customer Reviews
£156.82 inc VAT

£142.76 inc VAT

£118.97 ex VAT

View Product

Front view of a FireAngel heat alarm with 10 year long life battery showing test button and vents

10 Year Longlife Battery Heat Alarm - FireAngel FA6720-R

See Description...
  • Battery: 10 year sealed lithium battery
  • Warranty: 5 year warranty
  • Suitable for travel accommodation such as motorhomes
  • Quiet test and Sleep Easy function
  • Kitemarked to BS 5446-2: 2003
4.7 out of 5 stars

£26.45 inc VAT

£22.04 ex VAT

View Product

Four FireAngel alarms including two circular smoke alarms and a heat alarm with test/silence buttons and an oval carbon monoxide alarm with multilingual labelling.

Flat Smoke and CO Alarm Starter Kit - FireAngel FAKIT1

See Description...
  • Battery: lithium battery (included)
  • Warranty: 5 year warranty
  • 2x smoke alarms, 1x heat alarm, 1x carbon monoxide alarm
  • Certified to BS EN BS 5839-6: 2019 (smoke and heat alarm)
  • Certified to BS EN 50291-2: 2019 (CO alarm for domestic use)
  • UKCA marked
Customer Reviews
£101.45 inc VAT

£84.01 inc VAT

£70.01 ex VAT

View Product

Six FireAngel alarms: four round smoke alarms, one round heat alarm with a different sensor design, and two rectangular carbon monoxide alarms.

Home Smoke and CO Alarm Starter Kit - FireAngel FAKIT2

See Description...
  • Battery: Sealed lithium battery
  • Warranty: 5 year warranty
  • 3x smoke alarm, 1x heat alarm, 2x carbon monoxide alarm
  • Certified to BS EN BS 5839-6: 2019 (smoke and heat alarm)
  • Certified to BS EN 50291-2: 2019 (CO alarm for domestic use)
  • CE and UKCA marked
Customer Reviews
£153.12 inc VAT

£125.69 inc VAT

£104.74 ex VAT

View Product

hispec rf combi mains heat carbon monoxide detector shown from the front with visible test button and indicator lights

Mains Powered Heat & CO Detector with Rechargeable Lithium Battery Backup - Hispec RF10-PRO

See Description...
  • Power: 230V mains powered with lithium back-up battery
  • Back-up Battery: Rechargeable lithium battery
  • Warranty: 5 year manufacturer's warranty
  • Multi-sensor alarm containing both an heat and CO sensor
  • Radio-interlink up to 20 compatible alarms
  • Kitemarked to BS 5446-2: 2003 (heat)
  • Kitemarked to BS EN 50291-1: 2018 (carbon monoxide)
  • Also suitable for both the Welsh and Scottish 2022 legislation
Customer Reviews

£134.05 inc VAT

£111.71 ex VAT

View Product

Front of a HiSPEC heat alarm with labeled “AC POWER” and “ALARM” indicators, a “PUSH TO TEST / SILENCE” button, and a “SLIDE TO REMOVE” arrow at the bottom.

Mains Powered Heat Alarm with Lithium Back-Up Battery - Hispec RF10-PRO

See Description...
  • Power: mains powered with battery backup
  • Back-Up Battery: Rechargeable lithium battery
  • Warranty: 5 year manufacturer's warranty
  • Interlinks with up to 20 compatible devices
  • Combined test and hush button
  • Suitable for BS 5839-6: 2019 Grade D1
  • Also suitable for both the Welsh and Scottish 2022 legislation
5 out of 5 stars

£82.75 inc VAT

£68.96 ex VAT

View Product

Front view of hispec radio frequency combo mains smoke heat detector showing its circular design and test button

Mains Powered Smoke & Heat Alarm with Rechargeable Lithium Battery Backup - Hispec RF10-PRO

See Description...
  • Power: 230V mains powered with lithium back-up battery
  • Back-up Battery: Rechargeable lithium battery
  • Warranty: 5 year manufacturer's warranty
  • Multi-sensor alarm containing both a smoke and heat sensor
  • Radio-interlink up to 20 compatible alarms
  • Kitemarked to BS EN 14604: 2005 (smoke)
  • Kitemarked to BS 5446-2: 2003 (heat)
  • Also suitable for both the Welsh and Scottish 2022 legislation
Customer Reviews

£136.55 inc VAT

£113.79 ex VAT

View Product

Group of radio interlinked sealed battery smoke and heat alarms from the radio interlinked sealed battery 3 smoke 1 heat 1 co alarm kit

Radio-Interlinked Sealed Battery 3 Smoke, 1 Heat, and 1 CO Alarm Kit - Hispec RF10-Pro Range

See Description...
  • Battery: 10 year sealed lithium battery
  • Warranty: 5 year warranty
  • Radio-interlink up to 20 Hispec RF10-Pro Alarms
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Compatible with the Hispec Control Unit
  • Also suitable for the 2022 Scottish legislation
5 out of 5 stars
£167.38 inc VAT

£113.56 inc VAT

£94.63 ex VAT

View Product

Two round white Ei wireless RF smoke and heat alarms with minimalistic circular designs and central test buttons.

10 Year Sealed Lithium Battery Radio-Interlinked Optical Smoke Alarms & Heat Alarms - Aico Ei600 Series

See Description...
  • Battery operated - 10 year sealed lithium battery
  • Wireless radio-interlinked - can interlink with both mains and battery operated alarms
  • 10 year sealed lithium battery
  • Frequently accepted as alternative to mains powered alarms
  • Suitable for BS 5839-6: 2013 Grade F1 installations
  • Please note: alarms are sold individually
  • Also suitable for the 2022 Scottish legislation
4.7 out of 5 stars

From: £86.27 inc VAT

£71.89 ex VAT

View Product

Two round white FireAngel alarms, one smoke and one heat model, each with front‑facing LED indicators and test buttons.

Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - FireAngel W1-R Series

See Description...
  • Power: 230V mains powered with battery back-up
  • Backup Battery: 9V alkaline battery (included)
  • Warranty: 1 year warranty
  • Available in Optical and Heat versions
  • Interlinks with up to 12 units
  • Kitemarked, CE marked and suitable for BS 5839-6: 2019 Grade D2
  • Please note: alarms are sold individually
  • Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
4.9 out of 5 stars
£21.71 inc VAT

From: £20.75 inc VAT

£17.29 ex VAT

View Product

Two round white Kidde FireX alarms shown front‑on, one smoke alarm and one heat alarm, each with ventilation slots and central test buttons.

Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Kidde Firex KF Series

See Description...
  • 230V mains powered with alkaline back-up battery
  • Available in Optical and Heat versions
  • Interlink with up to 24 units
  • Suitable for BS 5839-6: 2019 Grade D2 installations
  • Kitemarked and CE marked
  • Please note: alarms are sold individually
  • Also suitable for both the Welsh and Scottish 2022 legislation
4.8 out of 5 stars
£20.10 inc VAT

From: £19.90 inc VAT

£16.58 ex VAT

View Product