Oct 4, 2026Regulations & Compliance
BS 5446-2 and Heat Alarms: What UK Buyers Need to Confirm
Heat alarms for UK kitchens are tested to BS 5446-2, not EN 14604 and not EN 54-5. This guide explains the difference, what the standard covers, and what UK buyers must confirm before sourcing...
BS 5446-2 and Heat Alarms: What UK Buyers Need to Confirm
Kitchens are the most common place a standard smoke alarm fails — steam, grease and cooking fumes trigger nuisance alarms until the user disables the unit. The correct product for a kitchen is a heat alarm, and in the UK the relevant product standard is BS 5446-2, not EN 14604 and not EN 54-5.
Confusing these standards is one of the most common compliance mistakes in fire-alarm sourcing. This guide clears it up.
Heat alarms vs smoke alarms vs heat detectors
Device | Standard (typical) | Application |
Smoke alarm | EN 14604 | Bedrooms, hallways, living rooms |
Heat alarm | BS 5446-2 | Kitchens, garages, dusty or steamy areas |
Heat detector | EN 54-5 | Commercial fire detection systems, connected to a panel |
A heat alarm is a self-contained residential device that sounds locally (and can interlink with other alarms). A heat detector is a component of a commercial fire detection system. They are different products for different markets. A report to EN 54-5 does not certify a residential heat alarm, and vice versa.
What BS 5446-2 specifies
BS 5446-2 is the UK specification for heat alarms for dwellings. It defines:
• Activation behaviour — the temperature conditions under which the alarm must operate.
• Alarm sound output — sufficient to warn occupants.
• Robustness — resistance to dust, humidity and typical kitchen conditions.
• Interconnection behaviour, where the device supports it.
• Marking and instructions.
Because heat alarms are fitted in kitchens and garages — environments that would cause nuisance alarms in a smoke detector — their response model is deliberately different. They react to a sustained temperature rise rather than to smoke particles.
Why the activation temperature matters
Residential heat alarms typically activate within a defined static temperature band, commonly in the region of 54–70 °C for this class of product. That band is a design decision: too low and the alarm sounds during normal cooking; too high and it responds too late. V-COME's heat alarms operate on a high-precision thermistor with an intelligent algorithm, with a heat sensitivity band of approximately 54–70 °C (exact specification confirmed per model).
What UK buyers must confirm
1. The report cites BS 5446-2, not EN 14604 and not EN 54-5.
2. The model on the report matches the heat alarm you are buying.
3. Interconnection is stated if you need it to link with smoke and CO alarms.
4. Sound output is adequate and documented.
5. Suitability for kitchen/garage is stated in the product documentation, with guidance to use a heat alarm rather than a smoke alarm in those areas.
Where heat alarms are required
The Scottish alarm standard requires a heat alarm in the kitchen as part of an interlinked system, alongside interlinked smoke alarms and a CO alarm where there is a carbon-fuelled appliance. In the wider UK, best practice and many landlord regimes also point to heat alarms in kitchens. This is a durable demand driver for BS 5446-2 products — see our guide to the Scottish standard.
FAQ
Is a heat alarm the same as a smoke alarm?
No. A heat alarm responds to temperature; a smoke alarm responds to smoke particles. Kitchens should use a heat alarm to avoid nuisance alarms.
Which standard applies to UK heat alarms — BS 5446-2 or EN 54-5?
For residential heat alarms, BS 5446-2. EN 54-5 is for commercial heat detectors used within fire detection systems.
Can a heat alarm be interlinked with smoke and CO alarms?
Yes — many residential heat alarms, including wireless (RF) models, can interlink with compatible smoke and CO alarms to form a whole-home system.
Does a heat alarm replace a smoke alarm in a kitchen?
In a kitchen you fit a heat alarm instead of a smoke alarm. The rest of the home still needs smoke alarms per the applicable rules.
About V-COME — Focused. Professional. Reliable.
V-COME Safety Technology Co., Ltd manufactures heat alarms to BS 5446-2:2003, including wireless interlinked and Wi-Fi models, alongside smoke, CO and combination alarms. Certified to EN 14604:2005/AC:2008, BS 5446-2:2003, EN 50291-1:2018, UKCA, CE, RoHS, REACH and ISO 9001:2015.
Contact: Jessy Chen — jessy@vcome-safety.com