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Mains Optical Smoke Alarm with Alkaline Battery Backup - Firehawk FHN250BB

4.7 out of 5 stars
£18.83 inc VAT
£15.69 ex VAT
Product Overview

The mains powered Firehawk FHN250BB is an optical smoke alarm with an alkaline battery backup, which is ideal for Grade D2 installations in locations such as living areas, bedrooms, hallways and landings. The push-fit base makes for quick and easy installation of the smoke alarm. In one system, this alarm can interlink with up to 14 other Firehawk smoke alarms from the FHN250 and FHN450 ranges. This alarm comes with a 6 year manufacturer's warranty for peace of mind, as well as a test and silence button which covers the face of the alarm for ease of use. Featuring TSE-Technology and an X-Profile sensing chamber, this reduces the number of false alarms and ensures that that slow smouldering fires are detected quickly.

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 mains powered optical 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 FIFHN250BB
Alternative Product Codes FHN250BB
Brand Firehawk
Back-Up Battery

3 x AAA Alkaline Replaceable Batteries

Dimensions (HxDia)

55 x 113mm

Operating Temperature

0°C to 40°C

Power Type

230V Mains Powered with Back-up Battery

Relative Humidity

< 85%

Sound Output


Storage Temperature

5°C to 30°C


6 years

Weight 0.25kg
Product Datasheets

Key Product Features

Fast-Fix design uses Push-Fit connectors for a quick installation

End of life warning chirp can be silenced for up to 10 hours

Hardwire interlink up to 15 FHN450 heat alarms and FHN250 smoke alarms

Backup: 3 x AAA alkaline batteries (supplied)

Pricing & Availability

Model Stock Price
Product Code: FIFHN250BB Stock Level:
More than 20 in stock Expected dispatch: 21st May

£18.83 inc VAT

£15.69 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

3 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: 4 / 5 Stars

Reviewed by: S J

Works well Tricky small terminal box but ok for an experienced electrician.

Published on: 9th July 2023

Rating: 5 / 5 Stars

Reviewed by: S R

Direct replacement for a previous one, delivered in very quick time.

Published on: 28th September 2022

Rating: 5 / 5 Stars

Reviewed by: K

Speedy dispatch, working perfectly

Published on: 10th June 2022

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