Mains Powered Heat Alarm with Alkaline Back-up Battery - Firehawk FHN450BB
The Firehawk FHN450BB is a mains powered heat alarm with a replaceable alkaline battery backup, which is supplied with easy-to-replace AAA alkaline back-up batteries. The FHN450BB is perfect for installations in kitchens, garages and unoccupied lofts with its advanced thermistor detection to assist with heat detection. Any low battery warnings or end of life chirps can be silenced with the large test and hush button for up to 10 hours, to ensure that it does not disturb the household during the night, with the capability to override this in an event of a fire and alert the occupants. The supplied Fast-Fix bases allows for smoke and heat alarms from the same range to be swapped over if required.
- 230V mains powered with battery backup
- 3 x AAA alkaline battery backup
- 6 years manufacturer's warranty
- Suitable for installations in kitchens, garages and unoccupied lofts
- Can hardwire interlink up to 15 Firehawk alarms within single system, including;
- Fast-Fix bases allows for quick installation and replacement of alarms from the same range using Push-Fit connectors
- Low battery warnings and end of life chirps can be silenced for up to 10 hours
- Large test and silence button for easy testing and silencing
- Suitable for installations complying to
- CE marked and Kitemarked to
- 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.
Customer Reviews (3)
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.
Reviewed by
M R
Published on
11th May 2026
Reviewed by
K M
Published on
1st January 2026
The heat alarm links to the fire alarms.
Very pleased with these products.
Reviewed by
S D
Published on
30th March 2023
As promised. Very easy to install as a replacement.
Very good value for money and comes with an excellent provenance.
Technical Data
| Product Code | FIFHN450BB |
|---|---|
| Brand | Firehawk |
| Back-Up Battery Type | Alkaline |
| Battery Type | AAA Batteries |
| British Standard Grade | Grade D2: Mains Powered (replaceable backup) |
| Colour | White |
| Local Legislation | Scottish Legislation (2022) |
| Welsh Legislation (2022) | |
| Northern Ireland Legislation (2024) | |
| Approvals & Markings | CE Marked |
| Compliance | BS 5446-2: 2003 |
| BS 5839-6 | |
| Connection | Wired |
| Display | LED Indicators |
| Fixing Options | Screws (included) |
| Installation Position | Ceiling |
| Material | Plastic |
| Maximum Number of Linked Devices | 14 Devices |
| Operating Temperature | 0°C To +40°C |
| Positioning | Garages |
| Kitchens | |
| Unconverted Loft Spaces | |
| Power Type | Mains Powered (230V) |
| Product Range | FireHawk FHN Series |
| Relative Humidity | Less Than 85% |
| Recyclable | Yes - Valpak's WEEE Distributor Take-back Scheme |
| Sensor Type | Heat |
| Sound Level | 85dB |
| Suitability | Home |
| Warning Type | Audible - Alarm Sounder |
| Warranty | 6 Years |
| Dimensions (Unit) |
|
| Weight | 180g |
| Datasheets |
Interlink
Please Note: these FHN series alarms are not compatible with the older FH models.
| Product Code | Description | Interlink Type |
| FIFHN250BB | Mains Smoke Alarm with Alkaline Battery Backup | Hardwire Interlink |
| FIFHN450BB | Mains Heat Alarm with Alkaline Battery Backup | Hardwire Interlink |
| FIFHN250RB | Mains Smoke Alarm with Lithium Battery Backup | Hardwire Interlink |
| FIFHN450RB | Mains Heat Alarm with Lithium Battery Backup | Hardwire Interlink |
Excellent and easy to install.