Roundups6. Home comfort, heating

6. Home comfort, heating

Best carbon monoxide alarms for UK homes compared in 2026

Carbon monoxide alarms differ in how they are powered, how they show readings and where they can be placed. This roundup compares five models by sensor and battery life, alarm sound, screen and test features, stated standards and price, so you can see how each one stacks up before choosing for your home.

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Our Top Pick

Best value with display

X-Sense's XC0C-SR is the cheapest at £11.99 and still offers a 10-year sensor, a digital display, peak-value memory and replaceable AA batteries.

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Carbon monoxide alarms at a glance

Product	Brand	Price	Retailer	Pack count	Sensor life	Battery life	Power type	Alarm	Screen/test/memory	Placement	Stated standard	Price
Kidde K5CO	Kidde	£13.75Checked 6 Nov 2026, 17:00 UTC	Amazon UK	1	10 years (electrochemical)	—	2 AA batteries included	85dB at 3m, red flashing warning	—	Wall mount or freestanding	Kitemarked to BS EN 50291-1	£13.75
FireAngel FA6813 Portable CO Alarm	FireAngel	£13.98Checked 6 Nov 2026, 17:00 UTC	Amazon UK	1	10 years	—	Battery powered	85dB(A) at 3m, four chirps and flashing red CO light	Test button	Home and travel, including caravans, campervans and cars	—	£13.98
X-Sense XC0C-SR	X-Sense	£11.99Checked 6 Nov 2026, 17:00 UTC	Amazon UK	1	10 years (electrochemical)	AA batteries stated to last 3 years	Replaceable AA batteries	—	Digital display, CO peak-value memory	Freestanding or wall-mounted	EN 50291 stated	£11.99
FUMIXTEX Portable CO Detector	FUMIXTEX	£14.27Checked 6 Nov 2026, 17:00 UTC	Amazon UK	1	10 years	—	Replaceable batteries	—	LCD display, silent test button	Portable format	—	£14.27
XINDUM CO Alarm	XINDUM	£15.69Checked 6 Nov 2026, 17:00 UTC	Amazon UK	1	Electrochemical sensor	10-year battery	Battery	85dB alarm	LCD	Wall mount or stand, portable	EN50291 stated	£15.69

Please check the Amazon page for the current price.

Carbon monoxide alarms compared

Best for Kitemark

Kidde K5CO

A 10-year electrochemical sensor alarm with batteries included and a stated Kitemark to BS EN 50291-1.

The Kidde K5CO has an electrochemical sensor with a 10-year life and comes with two AA batteries, so it is ready to set up. The alarm sounds at 85dB at 3m and has a red flashing warning. It can be wall mounted or used freestanding, and it is Kitemarked to BS EN 50291-1 at £13.75.

Price£13.75Checked 6 Nov 2026, 17:00 UTC

Key Details

Pack count: 1
Sensor life: 10 years (electrochemical)
Power type: 2 AA batteries included
Alarm: 85dB at 3m, red flashing warning
Placement: Wall mount or freestanding
Stated standard: Kitemarked to BS EN 50291-1
Price: £13.75

What We Like

Batteries included in the box
Kitemarked to BS EN 50291-1

Considerations

Costs £1.76 more than the X-Sense XC0C-SR

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Best for travel

FireAngel FA6813 Portable CO Alarm

A battery-powered 10-year CO alarm made for the home as well as caravans, campervans and cars.

This FireAngel alarm is battery powered and has a 10-year life. It is made for home and travel use, including caravans, campervans and cars. The alarm sounds at 85dB(A) at 3m, with four chirps and a flashing red CO light. A test button is included, and it costs £13.98, making it a flexible pick for holidays.

Price£13.98Checked 6 Nov 2026, 17:00 UTC

Key Details

Pack count: 1
Sensor life: 10 years
Power type: Battery powered
Alarm: 85dB(A) at 3m, four chirps and flashing red CO light
Screen/test/memory: Test button
Placement: Home and travel, including caravans, campervans and cars
Price: £13.98

What We Like

Made for home, caravans, campervans and cars
Four chirps plus flashing red CO light

Considerations

Priced £2.00 above the cheapest alarm in this roundup

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Best value with display

X-Sense XC0C-SR

A £11.99 alarm with a 10-year electrochemical sensor, digital display and CO peak-value memory.

The X-Sense XC0C-SR has a 10-year electrochemical sensor and uses replaceable AA batteries, stated to last 3 years. A digital display and CO peak-value memory set it apart at this price. It can stand freestanding or be wall-mounted, and EN 50291 is stated. At £11.99, it is the cheapest alarm in this roundup.

Price£11.99Checked 6 Nov 2026, 17:00 UTC

Key Details

Pack count: 1
Sensor life: 10 years (electrochemical)
Battery life: AA batteries stated to last 3 years
Power type: Replaceable AA batteries
Screen/test/memory: Digital display, CO peak-value memory
Placement: Freestanding or wall-mounted
Stated standard: EN 50291 stated
Price: £11.99

What We Like

Digital display and CO peak-value memory
Lowest price at £11.99

Considerations

Batteries are stated to last 3 years, shorter than the 10-year sensor

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Best for LCD and silent test

FUMIXTEX Portable CO Detector

A portable CO detector with an LCD display, silent test button and replaceable batteries.

The FUMIXTEX is a portable CO detector with a 10-year sensor life and replaceable batteries. An LCD display shows information at a glance, and a silent test button lets you check it without the full alarm sounding. It costs £14.27, which suits anyone wanting a screen and a quiet test option in a portable format.

Price£14.27Checked 6 Nov 2026, 17:00 UTC

Key Details

Pack count: 1
Sensor life: 10 years
Power type: Replaceable batteries
Screen/test/memory: LCD display, silent test button
Placement: Portable format
Price: £14.27

What We Like

LCD display included
Silent test button

Considerations

Replaceable batteries will need changing within the 10-year sensor life

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Best for 10-year battery

XINDUM CO Alarm

An electrochemical-sensor alarm with a 10-year battery, LCD, 85dB alarm and EN50291 stated.

The XINDUM alarm has an electrochemical sensor and a stated 10-year battery, so there are no batteries to swap. It has an LCD and an 85dB alarm, and can be wall mounted or placed on a stand. It is portable, and EN50291 is stated. At £15.69, it is the highest-priced option in this roundup.

Price£15.69Checked 6 Nov 2026, 17:00 UTC

Key Details

Pack count: 1
Sensor life: Electrochemical sensor
Battery life: 10-year battery
Power type: Battery
Alarm: 85dB alarm
Screen/test/memory: LCD
Placement: Wall mount or stand, portable
Stated standard: EN50291 stated
Price: £15.69

What We Like

10-year battery stated
LCD with wall mount or stand placement

Considerations

Highest price at £15.69

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