Best Home Carbon Monoxide Alarms UK 2026
Since June 2022 every UK home with a solid-fuel appliance is legally required to have a working BS EN 50291-1 carbon monoxide alarm. For gas appliances it's been required for landlords since 2015 and best-practice for owner-occupiers. Five alarms compared for sensor type, battery life and smart-home integration.
Why it matters
Carbon monoxide is colourless, odourless and 50+ people die from it in UK homes every year — most from faulty appliances or blocked flues. A £20 sealed alarm is the cheapest piece of life insurance you'll ever buy, and it's required by Building Regs if you have a stove, gas boiler or gas hob.
How we chose
- BS EN 50291-1:2010 certification (UK Building Regs minimum)
- Sealed 10-year battery vs replaceable (Building Regs allow both)
- Smart-home integration where it adds genuine value (multi-room alerts)
- End-of-life warnings — alarms degrade and must be replaced after 7-10 years
Our picks
FireAngel FA6813 10-Year CO Alarm
Sealed 10-year lithium battery, certified for solid-fuel and gas appliances, no maintenance. The default UK choice for stove households — meets all current Building Regs.
Best for: Anyone who just wants compliant and forget-about-it.
Check latest price on Amazon UKX-SENSE Carbon Monoxide Detector
10-year sealed battery, digital display, EN 50291-1 certified. Cheaper than FireAngel and well-rated — solid all-rounder with a real-time ppm reading.
Best for: Households who want visual feedback, not just an alarm.
Check latest price on Amazon UKHoneywell Home R200C-1 CO Detector
Honeywell Home (formerly Resideo) — 7-year sensor life, audible 85dB alarm, end-of-life chirp. Trusted brand for landlords and HMO compliance.
Best for: Landlords and rentals needing a recognised compliance brand.
Check latest price on Amazon UKSmart Wi-Fi Carbon Monoxide Alarm (10-Year Battery)
Budget 10-year sealed CO alarm with test/silence button. EN 50291-1 certified. Highest reviews-to-price ratio in the category — solid backup unit for additional rooms.
Best for: Adding extra alarms in multi-storey homes or holiday lets.
Check latest price on Amazon UKOur verdict
FireAngel FA6813 is the default — sealed 10-year battery, lifetime warranty, meets all UK Building Regs. X-SENSE if you want the digital ppm display. Honeywell R200C-1 for landlords needing a recognised brand. Add the budget unit as a secondary alarm in detached buildings or holiday lets.