FireAngel FA3322 10-Year Digital Carbon Monoxide Alarm review
By Tom Calder
The FA3322 is an independently well-rated CO alarm with a sealed 10-year battery, so it's fit and forget. It's a sound, low-maintenance choice for most UK homes.
- Best for
- Bedrooms and living rooms wanting a clear, readable CO alarm with no battery faff
- Skip it if
- You just want the cheapest compliant alarm
as of 2 Nov 2026, 13:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Which? Best Buy-rated carbon monoxide alarm
- 10-year sealed battery — nothing to replace
- Widely stocked: Screwfix, Toolstation, B&Q, Wickes, Amazon
Worth knowing
- Costs more than a basic non-digital CO alarm
- Wall-mount bracket is screw-fix, not adhesive
ⓘ As an Amazon Associate, PreparedBritain earns from qualifying purchases. We may earn a commission when you buy, or a fee when you request a quote, through our links. When two products are close, commission can decide which one we pick. A clearly better product always wins. Amazon prices come from Amazon's own product data and show the date and time they were retrieved. Prices at other retailers are checked by us, less often. Prices and stock can change at any time, so always check the retailer's price before you buy.
Our review
The FireAngel FA3322 is a battery carbon monoxide alarm with a sealed ten-year battery and a colour-changing screen that shows CO readings and tells you what to do when it sounds. It is certified to the current BS EN 50291 standards and Kitemarked, and it suits a bedroom or living room with a boiler, fire or stove nearby.
Why a CO alarm matters
Carbon monoxide has no colour, taste or smell. The NHS advises getting an alarm that makes a loud sound when CO is present, for each room with a gas, oil, coal or wood-burning appliance, and lists headache, dizziness, feeling sick, weakness, confusion, chest pain and breathlessness among the symptoms. If you suspect CO, get into fresh air straight away, call the National Gas Helpline on 0800 111 999, and get medical advice from NHS 111, or call 999 if someone has trouble breathing or collapses. Our CO symptoms guide has more.
What it is
FireAngel lists certification to BS EN 50291-1:2018 and BS EN 50291-2:2019, a BSI Kitemark and an electrochemical sensor tuned for faster response to low levels. Part 2 of that standard covers alarms used in caravans and boats as well as homes. The battery is sealed and tamper-proof for the ten-year life of the alarm; the warranty is five years. It measures 129 by 76 by 31mm.
The screen changes colour and shows on-screen instructions, along with room temperature and humidity. FireAngel's images show readings from 10ppm, with warning and evacuate messages at higher levels. It also has data logging, a quiet self-test, an alarm memory that shows if it went off while you were out, and night sensing.
Placing it and the law
Follow the placement in FireAngel's instructions for the room and appliance, and test it monthly with the button. Write the replacement year on the alarm in marker when you fit it, so nobody has to work it out in 2036. In England, landlords must fit a CO alarm in any room used as living accommodation that contains a fixed combustion appliance (excluding gas cookers), under rules in force since 1 October 2022, covering private and social rented homes. An alarm is a backstop, not a replacement for having appliances serviced by a Gas Safe registered engineer. In a power cut, note that camping stoves, heaters and generators belong outside; see our log burner and CO guide.
How it compares
On the CO alarms page, the Aico Ei208 is the plain fit-and-forget choice with a sealed battery and no display; our Aico vs Kidde guide compares those two brands. FireAngel's own FA6812 gives a live ppm screen on replaceable AA batteries, and the X-Sense CO03D does the same for less. The Kidde 5CO and FireAngel FA6813 are basic AA models. The FA3322's advantage is the screen plus ten years with no battery changes, which removes the most common reason alarms fail: a battery taken out to stop a chirp and never replaced. If you want alarms in several rooms that sound together, Aico's RadioLINK models on the same page interlink wirelessly, which this one does not.
Our verdict
A clear, well-certified CO alarm that needs nothing doing for a decade beyond pressing test. Skip it if you just need a compliant alarm at the lowest cost; a basic Kitemarked model without a screen gives the same protection.
A researched review, built from the maker's specs, manual and UK listings; facts checked 2 Nov 2026. Sources: FireAngel: FA3322 10-year digital carbon monoxide alarm; NHS: carbon monoxide poisoning; GOV.UK: smoke and carbon monoxide alarm regulations Q&A.
Who shouldn't buy this
Skip it if you just want the cheapest compliant alarm — a basic FireAngel model without the digital display meets the same BS EN 50291 standard for less.
Key specs
| Standard | BS EN 50291-1:2018 & -2:2019 |
| Sensor life | 10 yrs, sealed-for-life battery yr |
| Display | Multi-function colour LCD |
| Power | Sealed 10-yr lithium battery |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Households with a gas boiler, hob, open fire or wood burner who want fit-and-forget protection.
as of 2 Nov 2026, 13:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A home rewiring or new build where CO alarms are fitted on the mains circuit.
as of 2 Nov 2026, 13:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A battery CO alarm with a live ppm readout, for a bedroom or a caravan.
as of 2 Nov 2026, 13:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
How long does the FireAngel FA3322 last?
Its sealed battery and sensor are designed for a ten-year life, after which the whole alarm is replaced. FireAngel's warranty is five years.
What standard does the FA3322 meet?
FireAngel lists BS EN 50291-1:2018 and BS EN 50291-2:2019, and the alarm carries a BSI Kitemark.
Where should I put a carbon monoxide alarm?
The NHS advises an alarm in each room with a gas, oil, coal or wood-burning appliance. Follow FireAngel's instructions for exact placement relative to the appliance.
What should I do if my CO alarm goes off?
Get everyone into fresh air straight away and call the National Gas Helpline on 0800 111 999. The NHS says to get advice from NHS 111, or call 999 if someone has trouble breathing or collapses.
Free alerts for your home
Home Alerts emails you when a power cut, a Met Office warning or a flood warning covers your postcode. Free for your own home. Sign up in a minute.
Start free →