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

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£29.94 inc VAT
£24.95 ex VAT
Product Overview

The Firehawk FHN250RB is a mains powered optical smoke alarm with sealed self-charging lithium back-up battery that employs TSE (Thermal Stability Enhancement) technology specifically designed to improves the faster detection of smoke. The Fast-Fix base is connected to the power supply and interlink cable while the alarm simply clicks into place, making maintenance and replacement quick and easy.

  • Optical smoke sensor suitable for hallways, landings, living rooms, and bedrooms
  • 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 FHN250RB smoke alarms and FHN450RB heat alarms in the same system
  • When one alarm detects a potential fire, all interlinked alarms will sound
  • TSE (Themal Stability Enhancement) Technology improves faster detection of smoke
  • Fast-Fix base offers discreet and easy installation process as well as interchangeability between smoke and heat alarms
  • End of life warning can be silenced for up to 10 hours
  • Large test and silence button – almost the whole face of the alarm
  • Compliant with BS 5839-6 Grade D1 installations
  • UKCA marked, CE marked, and approved to BS EN 14604: 2005

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

> 85%

Sound Output

85dB(A) at 3m

Storage Temperature

5°C to 30°C


10 Years

Weight 0.17kg
Product Datasheets

Pricing & Availability

Model Stock Price
Product Code: FIFHN250RB-FAP Stock Level:
12 in stock Expected dispatch: 20th May

£29.94 inc VAT

£24.95 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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