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FireAngel Smoke Alarms, Heat Detectors and CO Alarms — Thermoptek Technology and BS 5839 Guide for UK Electricians
Fire and carbon monoxide detection is a legal requirement for UK landlords and a professional duty of care for electricians working on domestic and commercial properties. FireAngel is one of the UK's leading alarm manufacturers, trusted by housing associations, local authorities, and contractors across Britain. This guide covers the FireAngel range available at APM Electricals — smoke alarms, heat detectors, and CO alarms — with practical guidance on where each device fits under BS 5839 and the Smoke and Carbon Monoxide Alarm (England) Regulations 2022.
Why FireAngel?
FireAngel alarms are specified widely by UK housing stock because of two key differentiators: Thermoptek technology and 10-year sealed batteries. Thermoptek combines optical (photoelectric) sensing with thermal sensing in a single chamber, reducing false alarms from cooking steam and shower vapour while increasing sensitivity to slow-smouldering fires. The 10-year sealed lithium battery eliminates the annual battery change call-out — a significant advantage on large managed portfolios.
All FireAngel alarms are BS EN 14604 certified (smoke alarms) or BS EN 50291 certified (CO alarms). The Smart RF radio-interlink system allows multiple alarms to be networked wirelessly without cable runs, making retrofits in occupied properties far more practical.
Compliance Overview — What the Regulations Require
The Smoke and Carbon Monoxide Alarm (England) Regulations 2022 require landlords to fit:
- A smoke alarm on every storey of residential accommodation
- A CO alarm in every room with a fixed combustion appliance (excluding gas cookers)
- Alarms tested and in working order at the start of each new tenancy
BS 5839-6 is the code of practice for domestic fire detection systems. For electricians advising clients, Grade D2 (mains-powered, with battery backup) is the specification for new builds and full rewires. Grade F2 (battery-only, 10-year sealed) is acceptable for rental properties and retrofit where running mains power to all locations is impractical. The FireAngel range covers both grades.
FireAngel ST-632 — Thermoptek Smoke Alarm with Radio Interlink
FireAngel ST-632 Thermoptek Smoke Alarm — 10 Year Battery, Radio Interlink Ready
The ST-632 is FireAngel's flagship standalone smoke alarm for rental and retrofit applications. Thermoptek dual sensing cuts false alarm rates versus optical-only alarms, and the built-in Smart RF module means it can be wirelessly interlinked with other FireAngel alarms without additional hardware. When one alarm triggers, all interlinked alarms sound — a requirement under BS 5839-6 Grade F2 for properties with more than one alarm.
The 10-year sealed lithium battery is tamper-proof and cannot be removed by tenants. Self-tests at regular intervals and signals a fault if the chamber is compromised. At £24.99, this is the workhorse of the range for electricians managing rental portfolios.
- Thermoptek optical + thermal dual sensing
- 10-year sealed lithium battery
- Smart RF radio interlink (up to 50 alarms per network)
- 85dB alarm at 3 metres
- BS EN 14604 certified
- Test/Hush button
FireAngel ST-622 — Multi-Sensor Smoke Alarm, Standalone
FireAngel ST-622 Thermoptek Multi-Sensor Smoke Alarm — 10 Year Battery
The ST-622 delivers the same Thermoptek multi-sensor technology as the ST-632 in a standalone configuration — suitable where interlink is not required or where the installation is a single-alarm, single-storey property. Identical 10-year sealed battery and BS EN 14604 certification.
Where you need to specify an alarm without radio capability — or where budget or simplicity is the priority — the ST-622 provides the same superior detection technology at the same price point. Use where the ST-632's interlink functionality is not required.
- Thermoptek optical + thermal multi-sensor
- 10-year sealed for life lithium battery
- Test/Hush button
- 85dB alarm
- BS EN 14604 compliant
- Grade F2 compliant (BS 5839-6)
FireAngel HW1-PF-T — Mains Heat Alarm for Kitchens and Garages
FireAngel HW1-PF-T Heat Alarm — Mains Powered with 9V Battery Back-up
Heat alarms are the correct choice for kitchens, garages, and loft spaces where cooking aerosols, exhaust fumes, or dust would trigger nuisance alarms from smoke detectors. The HW1-PF-T is mains-powered (230V) with 9V battery backup, making it a Grade D2 device — the specified standard for new build and full rewire projects under BS 5839-6.
Thermistek heat detection technology responds to both rate-of-rise and fixed temperature (58°C), catching fast-developing and slow-developing fires. The 9V backup battery ensures continuity of protection during power cuts.
For kitchens on rental properties where the regulations require detection on every storey and a smoke alarm would generate constant false alarms, the HW1-PF-T is the professional answer. Compatible with FireAngel Smart RF interlink when used in conjunction with compatible devices.
- 230V mains powered with 9V battery backup
- Thermistek heat detection — rate of rise + 58°C fixed
- 85dB alarm volume
- BS 5446-2 certified (heat alarms)
- Grade D2 compliant for new builds and rewires
- Suitable for kitchens, garages, loft spaces
FireAngel FS1326-T — 10 Year Carbon Monoxide Detector
FireAngel FS1326-T Carbon Monoxide Detector Alarm
The FS1326-T uses electrochemical CO sensing — the most accurate technology for domestic CO detection — with a 10-year sealed battery and Smart RF wireless interlink. CO is odourless and colourless: a detector is the only reliable warning system.
Under the 2022 Regulations, a CO alarm is mandatory in any room with a fixed combustion appliance — boilers, log burners, gas fires. At £27.99 with a 10-year battery, the FS1326-T is the straightforward specification for electricians completing compliance packages on managed properties. No annual battery changes, no call-outs.
- Electrochemical CO sensing technology
- 10-year sealed lithium battery
- Smart RF wireless interlink ready
- BS EN 50291-1 certified
- LED status indicators
- Compliant with Smoke and CO Alarm Regulations 2022
Specifying FireAngel on a Typical Rental Property
For a standard two-storey 3-bedroom rental property, a compliant installation under the 2022 Regulations and BS 5839-6 Grade F2 would typically include:
- Hallway (ground floor): FireAngel ST-632 smoke alarm
- Landing (first floor): FireAngel ST-632 smoke alarm (interlinked with ground floor)
- Kitchen: FireAngel HW1-PF-T heat alarm (avoids cooking false alarms)
- Boiler cupboard / living room with gas fire: FireAngel FS1326-T CO detector
All three devices can be wirelessly interlinked via Smart RF, so when the kitchen heat alarm triggers, both smoke alarms sound simultaneously. This meets the interconnection requirement under BS 5839-6 without running additional cables.
Where to Use Each FireAngel Product
| Product | Location | Power | BS Grade |
|---|---|---|---|
| ST-632 Smoke Alarm | Hallways, landings, living rooms | 10yr battery | F2 |
| ST-622 Smoke Alarm | Single-alarm properties, standalone use | 10yr battery | F2 |
| HW1-PF-T Heat Alarm | Kitchens, garages, lofts | Mains + 9V backup | D2 |
| FS1326-T CO Alarm | Boiler rooms, living rooms with gas fire, log burner rooms | 10yr battery | F2 |
Order FireAngel Alarms at APM Electricals
All FireAngel smoke alarms, heat alarms, and CO detectors are available online at apmi.uk with next-day delivery on orders placed before 3pm. Trade accounts available — call us on 020 8702 8080 or visit our trade counter at 24 Western Avenue, Acton, London W3 7TZ.
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