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  • 10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More 1
  • 10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More 2
  • 10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More 3
  • 10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More 4
  • 10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More 5

10 Best Carbon Monoxide Detectors UK 2024 | Google Nest, X-Sense and More

Most people know that they need to have a smoke alarm in their home so that they can be quickly alerted to a fire, but fewer people are aware of the importance of a carbon monoxide detector. Shockingly, 36% of UK homes do not have a carbon monoxide detector despite them only being a small investment that could save your life.

Keep reading to discover why you need a carbon monoxide monitor and the different types available, including portable ones for travel or use in caravans. Also, make sure to check out our reviews to find CO detectors from top manufacturers such as Kidde, Honeywell and Nest, as well as our handy placement tips.
Last updated 26/03/2024

Quick List - Top Carbon Monoxide Detectors

1

Google Nest

Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired)
Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired)

A Smart Detector and Alarm That You Can Control From Your Phone

2

X-Sense

Carbon Monoxide Alarm Detector
Carbon Monoxide Alarm Detector

A Low-Maintenance Device That Will Last a Decade

3

Kidde

Combination Smoke and Carbon Monoxide Alarm With Voice Notification10SCO
Combination Smoke and Carbon Monoxide Alarm With Voice Notification

Reliable Protection From Both Fires and Carbon Monoxide Leaks

4

Mercury

Battery Operated Carbon Monoxide AlarmCOD100B
Battery Operated Carbon Monoxide Alarm

A Trusted Budget Option That Does Not Sacrifice Quality

5

Scondaor

Carbon Monoxide AlarmDL-C101A
Carbon Monoxide Alarm

Easy to Use and Understand With Accessible Design Features

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Table of Contents

What Is a Carbon Monoxide Detector and Why Do You Need One?

What Is a Carbon Monoxide Detector and Why Do You Need One?
A carbon monoxide detector is a small device that can be placed in your home to alert you to the presence of carbon monoxide gas. Carbon monoxide can reach dangerous levels in your home when fuel-burning appliances like boilers or gas heaters don't burn their fuel fully. This can become more likely if your appliances are poorly maintained or are poorly ventilated without a good oxygen supply.


Carbon monoxide is an extreme health hazard that can quickly lead to carbon monoxide poisoning if it is not detected quickly. A detector is, therefore, an essential purchase as, being a colourless, tasteless gas without an odour, carbon monoxide cannot be directly detected by humans.


Having a functional carbon monoxide detector is especially important in the UK due to the architectural features of many British homes. With boilers often placed in cupboards near or even in bedrooms, we must be vigilant of carbon monoxide levels at all times.


For more ways to protect your family's safety, check out our 10 best baby monitors!

How to Choose a Carbon Monoxide Detector in the UK

Key Points to Consider
  1. To Stay Safe, Stick to EN 50291-Compliant Devices
  2. For a More Versatile Device, Opt for a Battery-Operated Detector
  3. Check the Specifications to Keep Track of Your Detector's Lifespan
  4. Buy a Detector With a Display to Monitor Battery Life
  5. To Monitor Carbon Monoxide Levels From Your Phone, Opt for a Smart Detector
1

Only Buy British Standard EN 50291-Compliant Devices for Your Home

Only Buy British Standard EN 50291-Compliant Devices for Your Home
When looking to buy a carbon monoxide detector for your home, only purchase detectors that clearly display that they are BS EN 50291-compliant. Unfortunately, there are some fake or low-quality carbon monoxide detectors available that do not adhere to this standard – and are therefore unlikely to operate properly in an emergency.


BS EN 50291-certified devices have been tested to ensure that they will activate within three minutes of exposure to high levels (330 ppm) of carbon monoxide in a domestic setting. This rapid response will allow you and your family to quickly evacuate the affected area before carbon monoxide poisoning takes hold.

2

Decide Between Mains-Powered Detectors That Never Run Out and Battery-Powered Types for Easier Setup and Useful Features

Decide Between Mains-Powered Detectors That Never Run Out and Battery-Powered Types for Easier Setup and Useful Features

Choose Mains-Powered Detectors for Their High Reliability Once Installed

Mains-powered carbon monoxide detectors are a great option as they remove the need to constantly check if the battery in your detector is still working, as well as reducing the cost that comes with having to repeatedly replace batteries over time.


However, bear in mind that some mains-powered detectors do come with an additional cost as they may need to be installed professionally. Attempting to install a mains-powered detector yourself could lead to safety issues in your home. 

Go for Battery-Powered Models If You Want an Easy-to-Fit Detector That Can Be Used at Home or Away

Battery-powered carbon monoxide detectors are popular as, unlike some mains-powered devices, they do not need to be installed by a professional. Because they are the most popular type on the market there is a greater range available than that of the mains-powered detectors, with many having additional features such as display screens and voice activation technology.


When travelling abroad, there is no guarantee that a carbon monoxide detector will be installed in your accommodation. The portability of battery-powered detectors makes them great for travelling as well as combating common camping hazards. But remember, you will need to check the battery often and replace it periodically.


For more peace of mind while you're not home, try our 10 Best Pet Cameras.

3

The Lifespan of Carbon Monoxide Detectors Can Vary Widely So Always Check the Specifications

The Lifespan of Carbon Monoxide Detectors Can Vary Widely So Always Check the Specifications
Make sure to check the stated lifespan of the carbon monoxide detector that you intend to buy. The lifespan range can vary significantly among detectors, with some detectors lasting less than five years while others can last up to ten.


This is why if you are buying multiple carbon monoxide detectors for your home, try to stick to the same model so that you know to replace them all at the same time. This will help cut down on the stress of maintaining your detectors.

4

Look for Units With a Display So You Can Monitor Carbon Monoxide Levels and Battery Life

Look for Units With a Display So You Can Monitor Carbon Monoxide Levels and Battery Life
Source:amazon.co.uk


Some carbon monoxide detectors come with a digital display that will show the current carbon monoxide levels being detected, with the display updating several times per minute. This is helpful if you want to have a constantly refreshed figure so you can monitor any fluctuations in the carbon monoxide level and discover any potential threats before they become dangerous.


Many of the detectors with screens will also monitor the battery life of the detector, so you will always have an awareness of the current power and whether you should consider replacing it soon.

5

Consider Detectors That You Can Control Via an App for Peace of Mind and Functionality

Consider Detectors That You Can Control Via an App for Peace of Mind and Functionality
Source:amazon.co.uk
Smart carbon monoxide detectors can connect to the internet and communicate with an app installed on your smartphone. The detector is then able to send notifications to your smartphone to alert you of things such as when the batteries in the detector are running low, when the detector suffers a hardware failure, and most importantly if the detector finds that carbon monoxide has reached dangerous levels.


This ability to keep track of carbon monoxide levels even when you’re not at home can offer important peace of mind, especially to parents who can now ensure that their home is safe for their children even when they are not physically there themselves.


As you can also control the carbon monoxide detector from your phone, it offers you greater control of the device. You can quickly silence false alarms from your phone, or receive diagnostic reports straight to your phone to read whenever it is convenient.


For more ways to keep your home safe, check out our top outdoor security cameras

Was the Buying Guide helpful?

10 Best Carbon Monoxide Detectors in the UK

This ranking has been compiled by the writing team at mybest UK via careful evaluation of the points made in the buying guide and thorough research of each product and comparing multiple verified customer reviews across the EC sites used.
Popularity
Products
Image
Click to purchase
Key features
1

Google Nest

Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired)

Google Nest Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired) 1

A Smart Detector and Alarm That You Can Control From Your Phone

2

X-Sense

Carbon Monoxide Alarm Detector

X-Sense  Carbon Monoxide Alarm Detector 1

A Low-Maintenance Device That Will Last a Decade

3

Kidde

Combination Smoke and Carbon Monoxide Alarm With Voice Notification10SCO

Kidde Combination Smoke and Carbon Monoxide Alarm With Voice Notification 1

Reliable Protection From Both Fires and Carbon Monoxide Leaks

4

Mercury

Battery Operated Carbon Monoxide AlarmCOD100B

Mercury  Battery Operated Carbon Monoxide Alarm 1

A Trusted Budget Option That Does Not Sacrifice Quality

5

Scondaor

Carbon Monoxide AlarmDL-C101A

Scondaor  Carbon Monoxide Alarm 1

Easy to Use and Understand With Accessible Design Features

6

FireAngel

Wireless Interlink Carbon Monoxide DetectorW2-CO-10XQ

FireAngel  Wireless Interlink Carbon Monoxide Detector 1

Perfect if You Are Looking to Build a Large Carbon Monoxide Detector Network

7

FireAngel

Carbon Monoxide AlarmCO-9X-10T-FF

FireAngel  Carbon Monoxide Alarm 1

Great for Both the Home and When Travelling

8

Firehawk

Carbon Monoxide AlarmCO7B

Firehawk Carbon Monoxide Alarm 1

A Compact and Discreet Detector That Can Be Placed Anywhere

9

Kidde

Carbon Monoxide Alarm 4MCO

Kidde  Carbon Monoxide Alarm  1

Can Easily Connect With Other Kidde Alarms to Fully Protect Your Home

10

Honeywell

Carbon Monoxide AlarmXC100

Honeywell  Carbon Monoxide Alarm 1

A Basic, Easy-to-Read Alarm for Those Who Don't Need Extra Features

If you don't see the product you're looking for, you can request that it be listed.
No.1

Google Nest
Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired)

Protect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired) 1
Source:argos.co.uk
Reference price
£94.95
High
Reference price
£94.95
High

A Smart Detector and Alarm That You Can Control From Your Phone

This carbon monoxide detector by Nest is the perfect all-in-one device. Not only does it combine a smoke and carbon monoxide detector, but it can also be completely controlled using your smartphone.

You’ll be able to closely monitor the levels of carbon monoxide detected at all times with this device. And as multiple devices can be connected within the home, it’ll alert you if there is a problem wherever you are in your house.
Was this Ranking helpful?
No.2

X-Sense
Carbon Monoxide Alarm Detector

Carbon Monoxide Alarm Detector 1
Source:amazon.co.uk
Reference price
£29.99
Mid
Reference price
£29.99
Mid

A Low-Maintenance Device That Will Last a Decade

X-Sense have produced this detector so that it is very low maintenance and easy to understand. The LCD screen is also backlit so that the carbon dioxide readings can be easily read even in dark environments.

As this detector is powered by a sealed lithium-ion battery with a ten-year warranty, you will not have to replace the batteries at all while this detector is in operation, which should give you peace of mind and save you money in the long run.
No.3

Kidde
Combination Smoke and Carbon Monoxide Alarm With Voice Notification10SCO

Combination Smoke and Carbon Monoxide Alarm With Voice Notification 1
Source:amazon.co.uk
Reference price
£20.24
Low Mid
Reference price
£20.24
Low Mid

Reliable Protection From Both Fires and Carbon Monoxide Leaks

With this combination smoke and carbon monoxide alarm, you are doubly protected from both the dangers of a fire and carbon monoxide poisoning for the full 10-year lifespan of this detector.

This detector also features a voice alarm that will clearly notify you of what type of danger has been detected. In an emergency, it can be easy to panic, so this feature will help you to quickly respond in the appropriate way.
No.4

Mercury
Battery Operated Carbon Monoxide AlarmCOD100B

Battery Operated Carbon Monoxide Alarm 1
Source:amazon.co.uk
Reference price
£14.99
Low
Reference price
£14.99
Low

A Trusted Budget Option That Does Not Sacrifice Quality

For a high quality carbon monoxide detector on a budget, this battery-powered Mercury carbon monoxide detector is highly recommended. It has also been built with a simple traffic light LED system so that you can quickly understand how the device is functioning and if it needs to be replaced.

The carbon monoxide detector will constantly monitor the carbon monoxide levels present, and display the results on its LCD screen. This feature is great for those looking for peace of mind about potential dangerous gasses in the home. 
No.5

Scondaor
Carbon Monoxide AlarmDL-C101A

Carbon Monoxide Alarm 1
Source:amazon.co.uk
Reference price
£23.99
Mid
Reference price
£23.99
Mid

Easy to Use and Understand With Accessible Design Features

This carbon monoxide detector by Scondaor is a great device to install if you want an easy to understand and use detector. It is perfect for the elderly or people with limited vision, as it comes with large lettering and a simple interface with large buttons.

This carbon monoxide detector also comes with a large digital LCD screen that clearly displays the carbon monoxide level that is currently being detected by the device. This is an excellent investment for a carbon monoxide detector with a 10-year lifespan.
No.6

FireAngel
Wireless Interlink Carbon Monoxide DetectorW2-CO-10XQ

Wireless Interlink Carbon Monoxide Detector 1
Source:amazon.co.uk
Reference price
£41.85
High Mid
Reference price
£41.85
High Mid

Perfect if You Are Looking to Build a Large Carbon Monoxide Detector Network

If you think that you will need a large number of carbon monoxide detectors to adequately cover most areas of your home, this detector from FireAngel is the ideal solution.

It has been designed to easily connect with up to 50 other carbon monoxide detectors that will ring their alarms simultaneously if one of them detects unsafe levels of carbon dioxide.
No.7

FireAngel
Carbon Monoxide AlarmCO-9X-10T-FF

Carbon Monoxide Alarm 1
Source:amazon.co.uk
Reference price
£24.36
Mid
Reference price
£24.36
Mid

Great for Both the Home and When Travelling

This compact battery-powered detector by FireAngel is great if you want a carbon monoxide detector that can be easily installed anywhere in the home. It has been designed to be easily affixed to a wall, or it can be placed on a shelf as it is also freestanding.

As the manufacturer has also made this device portable, it is great for any environment. So, you can install it in your home or take it with you on your travels to ensure you are safe and protected wherever you might be. 
No.8

Firehawk
Carbon Monoxide AlarmCO7B

Carbon Monoxide Alarm 1
Source:amazon.co.uk
Reference price
£20.99
Low Mid
Reference price
£20.99
Low Mid

A Compact and Discreet Detector That Can Be Placed Anywhere

As some carbon monoxide detectors can be unsightly, this detector has been designed to be compact and has a unique, stylish design that will allow it to blend into its surroundings.

With its large base, this carbon monoxide detector can be freestanding and firmly placed on a shelf without any worries that it may fall over; just make sure it's out of children's reach. It might be best to choose a wall-mounted detector for areas such as corridors where you are unlikely to have a shelf to place this freestanding detector.
No.9

Kidde
Carbon Monoxide Alarm 4MCO

Carbon Monoxide Alarm  1
Source:ebay.co.uk
Reference price
£49.99
High Mid
Reference price
£49.99
High Mid

Can Easily Connect With Other Kidde Alarms to Fully Protect Your Home

If you have other alarms in your homemade by well-known manufacturer Kidde, such as a fire or heat alarm, you should consider this detector. It is able to interconnect with these other devices to create a comprehensive alarm system for your home. However, this feature comes at a cost, and there are many other amazing detectors that have much lower prices with similar quality.

There is one impressive feature that sets this detector apart from many others on the market. Even though it is mains-powered, this detector also comes with a backup battery so that it will remain fully functional even in the event of a power cut.
No.10

Honeywell
Carbon Monoxide AlarmXC100

Carbon Monoxide Alarm 1
Source:amazon.co.uk
Reference price
£37.36
High Mid
Reference price
£37.36
High Mid

A Basic, Easy-to-Read Alarm for Those Who Don't Need Extra Features

Honeywell has designed this detector to be as simple as possible for the user. It has an integrated lithium-ion battery, so you won’t have to replace the battery in this device; it will last until the end of its lifespan.

They have also simplified the detector’s appearance so that it now only features three lights to indicate the power, whether there is a fault, and if carbon monoxide has been detected. But this simple interface may not suit those that want a detector that provides additional information, such as accurate carbon monoxide levels.

Where Should a Carbon Monoxide Detector Be Placed?

Where Should a Carbon Monoxide Detector Be Placed?
Although some carbon monoxide detectors look similar to smoke alarms, they have unique placement requirements so they should not be confused. Make sure to place your detector in the optimal position in order to ensure safety in your home or on your travels.


It is recommended that a carbon monoxide detector is placed in every room that has a fuel-burning appliance, such as a boiler, gas stove, or log burner, and place the detector at least one metre from the appliance so you do not get any false alarms. A carbon monoxide detector should also be placed at head height on a wall so that it can monitor carbon monoxide levels at breathing level.


You should also be placing carbon monoxide alarms near bedrooms, as you are unlikely to be able to recognise the signs of carbon monoxide poisoning while asleep. And if the detectors are placed near bedrooms, you should definitely be able to hear the alarm sounding. When in any doubt, consult with a professional for guidance.

Top 5 Carbon Monoxide Detectors

No. 1: Google NestProtect 2nd Generation Smoke + Carbon Monoxide Alarm (Wired)

No. 2: X-Sense Carbon Monoxide Alarm Detector

No. 3: KiddeCombination Smoke and Carbon Monoxide Alarm With Voice Notification10SCO

No. 4: Mercury Battery Operated Carbon Monoxide AlarmCOD100B

No. 5: Scondaor Carbon Monoxide AlarmDL-C101A

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The descriptions of each product are referenced from content available on manufacturer, brand, and e-commerce sites.

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