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Smoke and carbon monoxide alarm buying guide

Updated: 21 October 2026

You are on amazon.co.uk with a landing to cover and a boiler somewhere else in the house, and the grid mixes smoke-only discs with titles that mention carbon monoxide. This smoke and carbon monoxide alarm buying guide is the order to use before you sort by stars. A combination alarm is one housing with a smoke sensor and a carbon monoxide sensor, and it belongs on the shortlist only when both hazards are named and a standard is printed for each. Shelf prices and the eight cards are on the [smoke and CO detector comparison](/hub/fire-protection/smoke-and-co-detector), from the 19 October 2026 capture. A qualifying purchase can earn a commission at no extra cost to you.

You are on amazon.co.uk with a landing to cover and a boiler somewhere else in the house, and the grid mixes smoke-only discs with titles that mention carbon monoxide.

Our top picks

AEGISLINK AEGISLINK SC200

Best overall

AEGISLINK AEGISLINK SC200
7.7/10about £23.19
View offer
X-Sense X-Sense SC07

Alternative

X-Sense X-Sense SC07
8.6/10about £27.71
View offer
FireAngel FireAngel SCB10-R

Rank 3

FireAngel FireAngel SCB10-R
9.0/10about £29.99
View offer
On this page
  1. 1.It has to be a combination alarm
  2. 2.Both EN numbers, then a Kitemark if you can see one
  3. 3.Battery versus the nation
  4. 4.Room before extras
  5. 5.Checklist before you open a listing

It has to be a combination alarm

A listing that meets BS EN 14604 is talking about smoke. That standard does not sense carbon monoxide, and a carbon monoxide alarm does not sense smoke. The title and the sensor line both have to name the two hazards. If the spec line says only carbon monoxide sensor while the bullets say smoke and CO, as on the X-Sense XP0A-MR, treat the clash as unfinished. None of the eight kept listings is a mains Grade D2 system or a kitchen heat alarm.

Both EN numbers, then a Kitemark if you can see one

BS EN 14604 covers smoke. BS EN 50291-1 covers a household carbon monoxide alarm. A single disc stands in for both only when both numbers are met. The FireAngel SCB10-R at about £29.99 prints a Kitemark and BSI approval to EN 14604:2005+AC:2008 and EN 50291-1:2018. The X-Sense SC07 at about £27.71 names both EN numbers and does not print a Kitemark. The AEGISLINK SC200 and the Kitire packs show no EN number. Who each card is for is on the best combined smoke and CO alarm page.
AEGISLINK AEGISLINK SC200

Testsieger

AEGISLINK AEGISLINK SC200
7.7/10about £23.19
View offer

Battery versus the nation

A sealed 10-year cell and a 10-year sensor are different products. The FireAngel SCB10-R and the X-Sense SC07 claim a sealed lithium cell. The AEGISLINK SC200 claims a replaceable 3-year lithium cell. England does not force a sealed cell. Scotland, and Northern Ireland private tenancies, want a sealed life battery on a battery carbon monoxide alarm. Wales still wants mains interlinked smoke alarms. Match the cell to the nation on the landlord rules page.

Room before extras

Smoke and carbon monoxide often want different rooms. Public fire-safety advice puts a smoke alarm on the hall or landing ceiling, about 300 mm from walls and lights, and keeps it out of kitchens and bathrooms. Approved Document J wants the carbon monoxide alarm in the appliance room, 1–3 m from the appliance. Safelincs lists the FireAngel SCB10-R as unsuitable for a kitchen or a garage. If the boiler is in the kitchen, use combined versus separate alarms.

Checklist before you open a listing

Stop when a line on the amazon.co.uk page fails. You should see both hazards, BS EN 14604 and BS EN 50291-1, and a Kitemark if you are following the Scottish carbon monoxide line. The battery is sealed for Scotland or a Northern Ireland private let. Stars come last. The AEGISLINK’s 4.6 from 3,147 reviews does not print the EN numbers the FireAngel prints at 4.4 from 1,372.

Common questions

Is a smoke-only EN 14604 listing a combination alarm?
No. BS EN 14604 is the smoke-alarm standard. A combination alarm also needs a carbon monoxide sensor, and the household standard for that sensor is BS EN 50291-1. Smoke-only files were removed from this comparison before the cards were published. If the sensor line names only smoke, you are looking at a different product, however high the star rating sits.
Do I need both EN 14604 and EN 50291-1 on the listing?
You need both if that one disc is meant to be the smoke alarm and the carbon monoxide alarm. One number covers one hazard. In the 19 October 2026 capture, the FireAngel SCB10-R prints both, including EN 14604:2005+AC:2008 and EN 50291-1:2018, plus a Kitemark. The X-Sense SC07 names both EN numbers and does not show a Kitemark. Several other cards in the set show neither number, so a dual-hazard title is not the same check.
Is a Kitemark required, or is a vague EN line enough?
A Kitemark is not printed on every alarm that can be sold. It is the mark Scottish Fire and Rescue Service buying advice points to for a carbon monoxide alarm to EN 50291-1. A sentence that only says it conforms to EN, without the number, is weaker than a stated BS EN 14604 and BS EN 50291-1. If you cannot see the numbers or the mark, do not let the star rating fill the gap.
Is a sealed 10-year cell the same as a 10-year sensor?
No. A sealed cell, as claimed on the FireAngel SCB10-R and the X-Sense SC07, is not a battery you change. A 10-year sensor with a 3-year lithium cell, as on the AEGISLINK SC200, or a CR123A claimed for up to 5 years, as on the X-Sense XP0A-SR, means you will open the alarm. Scotland and Northern Ireland private tenancies want a sealed life battery when the carbon monoxide alarm runs on a battery. You still read the date on the unit.
Will one landing combination alarm cover a kitchen boiler?
No. Carbon monoxide siting for a fixed appliance is in the same room, 1–3 m from the appliance. A disc on the landing is the smoke position for the stairs, not the carbon monoxide position for a boiler behind a kitchen door. Safelincs also keeps the FireAngel SCB10-R out of kitchens and garages. You still want a separate carbon monoxide alarm in the appliance room, and a heat alarm in the kitchen.

Related pages

Heat detector

Smoke and CO detector

Best combined smoke and CO alarm from the UK listings

Where to fit a combined smoke and CO alarm in the UK

Combined smoke and CO alarm landlord rules in the UK

When a combined vs separate smoke and CO alarm fits

Sources

Public UK sources from the research digest, last checked on 19 October 2026. Prices, stars, and review counts are the amazon.co.uk lines captured that day.

  1. GOV.UK — Smoke and Carbon Monoxide Alarm (England) Regulations, landlord booklet (retrieved 19 October 2026)
  2. Approved Document B, volume 1, dwellings (retrieved 19 October 2026)
  3. Approved Document J circular, 2022 (retrieved 19 October 2026)
  4. Scottish Government — fire and smoke alarms in Scottish homes (retrieved 19 October 2026)
  5. Department for Communities — Northern Ireland private-tenancy alarms, 2024 (retrieved 19 October 2026)
  6. NHS — carbon monoxide poisoning (retrieved 19 October 2026)
  7. FireAngel SCB10 datasheet (retrieved 19 October 2026)