The FH250BB optical smoke alarms and FH450BB heat alarms from Firehawk are mains-powered alarms with hardwire interlink, allowing up to 15 compatible alarms in the house to sound a warning to occupants when one detects a possible fire. These models feature replaceable AAA alkaline back-up batteries to ensure continued fire detection during a power cut, or if mains-power is turned off for other reasons like decorating or a blown light bulb. The unique Fast-Fix mounting base design allows alarms to be easily removed for cleaning and replacing batteries without needing to cut the power or worry about wiring, and the alarms will chirp an "end of life" warning (which can be silenced overnight) when the whole unit needs replacing after 10 years.
The table below shows all alarms which can interlink via cable with the Firehawk FH250BB and FH450BB mains powered smoke & heat alarms.
|FH250BB||Mains Powered Optical Smoke Alarm with Alkaline Battery Backup||Hardwire|
|FH450BB||Mains Powered Heat Alarm with Alkaline Battery Backup||Hardwire|
|FH250RB||Mains Powered Optical Smoke Alarm with Sealed Lithium Battery Backup||Hardwire|
|FH450RB||Mains Powered Heat Alarm with Sealed Lithium Battery Backup||Hardwire|
3 x AAA Alkaline Replaceable Batteries
FH250BB Smoke: 55 x 113mm
FH450BB Heat: 69 x 113mm
0°C to 40°C
5°C to 30°C
We recommend using an optical smoke alarm in hallways, living rooms, dining rooms and bedrooms, as they are good at detecting smouldering fires from soft furnishings and are less likely to be set off by cooking fumes from a connected kitchen.
Ionisation alarms are recommended for landings as they are designed to react quickly to fast flaming fires.
Heat alarms are recommended for kitchens and garages as they do not sound false alarms from cooking fumes, vehicle fumes or steam.
All our mains powered alarms have a battery backup because, although mains powered alarms without this option do exist (BS5839 part 6 grade E), we regard them as far too dangerous. This is because a lot of fires are caused by electrical faults which would leave the building unprotected against fire if the smoke alarms had no backup battery. With our mains powered alarms you will always be protected.
The best location to install your smoke alarm is in the centre of the ceiling rather than on the wall.
During a fire, smoke initially rises and then spreads horizontally. Placing the smoke alarm in the centre of your ceiling means that it is closest to all four points of your room. This ensures that you receive the earliest possible warning of a fire.
For more information, read our guide to positioning your smoke alarm and guide to which smoke alarms are best for each room.
It is necessary that an electrician installs mains powered smoke alarms.
From February 2022 all homes in Scotland must be fitted with interlinking smoke and heat alarms. In addition carbon monoxide alarms are required if there is a carbon-fuelled appliance or flue. View our list of alarms suitable for the Scottish regulations.
FH250BB Optical Smoke Alarm
Product Code: FIFH250BB
More than 20 in stock Expected dispatch: 27th Jun
£14.22 inc VAT
£11.85 ex VAT
FH450BB Heat Alarm
Product Code: FIFH450BB
5 in stock Expected dispatch: 27th Jun
£15.48 inc VAT
£12.90 ex VAT
The following delivery options are available on this product.