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

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£31.14 inc VAT
£25.95 ex VAT
Product Overview

The Firehawk FHN450RB mains powered heat alarm features a sealed self-charging lithium back-up battery to ensure the occupants are still protected in the event of a mains power failure. Advanced Thermistor Detection developed specifically by Fireblitz uses bespoke software to improve sensor performance. Heat alarms are suitable for kitchens, garages, lofts, and other areas where smoke sensors would suffer frequent nuisance alarms due to dust or fumes. The Fast-Fix base has discreet trunking entry for easy surface-mounted installation and retro-fitting.

  • Heat sensor suitable for kitchens, garages, and lofts
  • Power: 230V mains powered with battery backup
  • Backup: 10 year sealed self-charging lithium battery
  • Warranty: 10 year manufacturer's warranty
  • Sealed lithium back-up battery is constantly recharged from mains power
  • Hardwire interlink up to 12 FHN450 heat alarms and FHN250 smoke alarms in the same system
  • Advanced Thermistor Detection improves sensor performance and reduces false alarms
  • When one interlinked alarm detects a potential fire, all other alarms will sound
  • Fast-Fix base provides easy installation as well as the ability to swap between smoke and heat alarms
  • Large test and hush button – almost the entire face of the alarm
  • Warning chirps to indicate end of life can be silenced for up to 10 hours
  • Suitable for installations complying to BS 5839-6 Grade D1
  • CE marked, UKCA marked, and Kitemarked to BS 5446-2: 2003

Please Note: these FHN series alarms are not compatible with the older FH models.


The table below shows all alarms which can interlink via cable with the Firehawk FHN450RB mains powered smoke alarm.

Please Note: these FHN series alarms are not compatible with the older FH models.

Mains-Powered Alarms

Model Description Battery Backup Interlink
FHN250BB Mains Powered Optical Smoke Alarm 3x AAA Alkaline (included) Hardwire
FHN450BB Mains Powered Heat Alarm 3x AAA Alkaline (included) Hardwire
FHN250RB Mains Powered Optical Smoke Alarm 10 Year Sealed Lithium Hardwire
FHN450RB Mains Powered Heat Alarm 10 Year Sealed Lithium Hardwire


Model Description Power Interlink
FHN600Remote Battery Powered Wireless Remote Control 1x CR2025 Coin Cell IR (infrared)

Technical Data
Product Code FIFHN450RB
Alternative Product Codes FHN450RB
Brand Firehawk
Battery Type

Sealed Self-Charging Lithium

Dimensions (HxDia)

69 x 113mm

Operating Temperature

0°C to 40°C

Relative Humidity

< 85%

Sound Output

85dB at 1m

Storage Temperature

5°C to 30°C


10 Years

Weight 0.15kg
Product Datasheets

Pricing & Availability

Model Stock Price
Product Code: FIFHN450RB-FAP Stock Level:
More than 20 in stock Expected dispatch: 20th May

£31.14 inc VAT

£25.95 ex VAT

Delivery Options

The following delivery options are available on this product.

Standard Delivery

£3.19 inc VAT - Orders will be delivered in 2-3 working days with Evri

Next Working Day Delivery

£6.19 inc VAT - Orders will be delivered the next working day with Evri

For dispatch today order within

Excellent Warranty

This product is supplied with a 10 year manufacturers warranty as standard

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