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Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Batteries - Firehawk

4.7 out of 5 stars
Save 8%
£68.24 inc VAT
£56.87 ex VAT
Product Overview

This mains powered Firehawk bundle features three smoke alarms and one heat alarm, each with an alkaline backup which will power the alarm in the event of a mains power outage. Ideal for Grade D2 installations, these alarms can be hardwire interlinked to provide the earliest possible warning of fire in your home, and are supplied with Fast-Fix bases to make installing and replacing alarms easy. A maximum of 12 Firehawk alarms can be connected together from the FHN250 and FHN450 ranges and have a 6 year manufacturer's warranty for peace of mind.

  • Ideal for installing throughout the 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
  • Suitable for installations complying with BS 5839-6: 2019 Grade D2
  • 12 devices in total can be hardwire interlinked from the FHN 250 (smoke) and 450 (heat) ranges:
  • Smoke alarm features X-Profile sensing chamber and TSE-Technology for improved detection and reduced false alarms
  • Heat alarm features Advanced Thermistor Detection making it suitable for kitchens, garages, lofts and workshops
  • Fast-Fix bases make installing and replacing alarms easy
  • 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 FIFHKIT1H3S
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

Operating Temperature

0°C to 40°C

Power Type

230V mains with battery backup

Relative Humidity

< 85%

Sound Output

85dB(A) at 3 metres

Storage Temperature

5°C to 30°C


6 years

Weight 1.00kg
Product Datasheets

Pricing & Availability

Model Stock Price
Product Code: FIFHKIT1H3S Stock Level:
More than 20 in stock Expected dispatch: 20th May

£68.24 inc VAT

£56.87 ex VAT

Delivery Options

The following delivery options are available on this product.

Standard Delivery

£4.99 inc VAT - Orders will be delivered in 2-3 working days with Evri

Next Working Day Delivery

£7.99 inc VAT - Orders will be delivered the next working day with Evri

For dispatch today order within

Customer Reviews

7 customers have given this product an overall rating of 4.7 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: B C

Great product and reasonable prices

Published on: 3rd December 2023

Rating: 5 / 5 Stars

Reviewed by: E A

Excellent product and great customer service.

Published on: 12th November 2023

Rating: 4 / 5 Stars

Reviewed by: S J

Works well Small terminal space makes for tricky connecting up.

Published on: 9th July 2023

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