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Mains Powered 2 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Batteries - Firehawk

5 out of 5 stars
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£51.46 inc VAT
£42.88 ex VAT
Product Overview

This mains powered Firehawk kit is supplied with two smoke alarms and one heat alarm; all of which are fitted with replaceable AAA alkaline back-up batteries making them ideal for Grade D2 installations. These alarms provide fire protection around your home and can be hardwire interlinked to create a network of up to 12 Firehawk devices from the FHN250 and FHN450 ranges to give the earliest possible warning of fire. If one alarm is activated, the whole system will sound. The supplied Fast-Fix bases also allow for the easy replacement or swapping of smoke and heat alarm heads from the same range if required.

  • Ideal for installations throughout your home
    • Smoke Alarms: Hallways, landings, living areas and bedrooms
    • Heat Alarm: Kitchens, garages and unconverted loft spaces
  • Power: 230V mains powered with alkaline back-up battery
  • Back-up Battery: 3 x AAA alkaline batteries (included)
  • Warranty: 6 years manufacturer's warranty
  • CE marked, and Kitemarked, plus the FHN450BB is UKCA marked
  • Suitable for installations complying with BS 5839-6: 2019 Grade D2
  • Additional smoke and heat alarms can be added to the system at any time, up to 12 devices in total
  • Smoke alarm features X-Profile sensing chamber designed to reduce false alarms and TSE-Technology for improved detection
  • Heat alarm features Advanced Thermistor Detection making it suitable for kitchens, garages, lofts and workshops
  • Quick installation and replacement of alarms with the supplied Fast-Fix bases
  • Large combined test and silence button for easy weekly testing and maintenance
  • Low battery warnings and end of life chirps can be silenced up to 10 hours
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

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 FHN250BB and FHN450BB.

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 FIFHKIT1H2S
Alternative Product Codes FHN250BB, FHN450BB
Brand Firehawk
Back-Up Battery

3 x AAA alkaline replaceable batteries (included)

Dimensions (HxDia)

FHN450BB - Heat Alarm: 69 x 113mm

FHN250BB - Smoke Alarm: 55 x 113mm

Heat Alarm Class

A1 heat detection: 54°C to 70°C

Operating Temperature

0°C to 40°C

Power Type

230V mains with battery backup

Relative Humidity

< 85%

Sound Output

85dB at 3 metres

Storage Temperature

5°C to 30°C


6 years

Weight 0.75kg
Product Datasheets

Pricing & Availability

Model Stock Price
Product Code: FIFHKIT1H2S Stock Level:
More than 20 in stock Expected dispatch: Today

£51.46 inc VAT

£42.88 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

Customer Reviews

2 customers have given this product an overall rating of 5 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5 Stars

Reviewed by: M W

Not quite finished installing as renovating

Published on: 10th December 2023

Rating: 5 / 5 Stars

Reviewed by: S M

great price easily installed

Published on: 12th June 2022

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464181


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