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Mains Optical Smoke Alarm with Sealed Self-Charging Lithium Battery Backup - Firehawk FHN250RB

5 out of 5 stars
£31.79 inc VAT
£26.49 ex VAT
Product Overview

The Firehawk FHN250RB is a mains-powered smoke alarm with an optical sensor and a sealed self-charging lithium back-up battery. Specifically designed technology such as the X-Profile and TSE (Thermal Stability Enhancement) reduce false activations from the detector whilst improving the performance of detection smoke. The Fast-Fix base allows for the alarm to be simply clicked into place for connection to the power supply and interlink cable. Maintenance and replacements are quick & easy, and alarms can be swapped between bases if needed. For extra peace of mind, the Firehawk FHN250RB comes with a 10 year warranty.

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 FHN250RB 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 FIFHN250RB
Alternative Product Codes FHN250RB
Brand Firehawk
Battery Type

Sealed Self-Charging Lithium

Dimensions (HxDia)

55 x 113mm

Operating Temperature

0°C to 40°C

Relative Humidity


Sound Output

85dB(A) at 3 metres

Storage Temperature

5°C to 30°C


10 Years

Weight 0.20kg
Product Datasheets

Key Product Features

Large test & silence button - almost the whole face of the alarm!

Fast-Fix base design separates wires from the alarm head for easy maintenance

Simple push-fit connector for surface-mounting installation

Interlink up to 12 FHN450 heat alarms and FHN250 smoke alarms in the same system

Pricing & Availability

Model Stock Price
Product Code: FIFHN250RB Stock Level:
More than 20 in stock Expected dispatch: 29th May

£31.79 inc VAT

£26.49 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

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: G S

Work well and look neat & tidy Used the Firehawks to replace my old mains BRK alarms and whilst the new ones work well and look good (as far as alarms do) the fixings are different but with a bit of juggling I managed to fit them on the old base and wire them into it so I didn't have to remove the old base plates to leave gaps in the paintwork or re-do the wiring from scratch. It would be a good area for standardisation if manufacturers could agree on a common baseplate and connector for mains alarms it would make life easier.

Published on: 20th October 2023

Rating: 5 / 5 Stars

Reviewed by: E G

Excellent advice and service goods arrived quickly

Published on: 6th April 2023

Looking for more information?

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