Best Carbon Monoxide Detectors

Best carbon monoxide detectors

Our editors independently research the best products online to produce this list. We may receive commission on purchases made from the links below but this will never affect our product choices.

There are some essential items every property needs for safety, and carbon monoxide detectors are among these. In homes and businesses with fuel-burning appliances like heaters, there is a risk of carbon monoxide poisoning. Statistics show that global deaths from this problem continue to rise. To ensure you are protected and that your property is compliant with safety standards, we have created a list of the seven current best devices available.

How We Compared Carbon Monoxide Detectors

To find the right carbon monoxide detectors, we considered multiple factors, including:

  • Battery Life
  • Standards Compliance
  • Alert Method
  • Usability
  • Storage

Our team planned comparison points and specifically looked for products that would cater to all kinds of needs. We spent countless hours researching, consulting customer reviews and comparing features to come up with this list.

Carbon Monoxide Detector Reviews

X-Sense 10-Year SC07 (Editor’s Choice)

If you don’t want the hassle of buying and installing separate safety devices, this 2-in-1 model is a brilliant choice. It operates as both a smoke alarm and a CO detector, thus offering far more convenience than other units.

The X-Sense SC07 is an advanced model with many great features. For example, it has a bright LCD screen that shows current carbon monoxide levels and battery life. Also, it has a simple design that can be ceiling-mounted or installed on flat surfaces.

The device is compliant with EN 50291 and EN 14604 standards (EN 50291 for CO and EN 14604 for Smoke), and the battery has a 10-year life. This means the model is suitable for domestic and commercial properties.


  • Operates as both a smoke alarm and CO detector
  • Compliant with EN 14604 and EN 50291
  • This model has a large, bright LED display screen
  • 10-year continuous usage lithium-ion battery
  • An excellent detection system with no blind spots


  • Some people may find the device difficult to activate
  • The unit could be quite large

Honeywell XC100 (Luxury Choice)

This model is suitable if you want a high-quality carbon monoxide detector that you can simply set up and forget about. This is due to the long battery life and the power units being sealed inside the casing.

The Honeywell XC100 Carbon Monoxide Alarm is easy to use and quick to install. It includes all the necessary fixtures and batteries, and the manual should be suitable to follow for anyone. We also like that it has the option of linking multiple CO detectors together for improved coverage.

The casing is tamper-proof to prevent accidental damage, meaning the batteries should remain secure regardless of any bumps and drops. It also has a useful end-of-life signal that shows when a replacement is needed.


  • This model has a simple installation process
  • Includes an optional pre-alarm for additional safety
  • Easy-to-store, compact design
  • Tamper-proof casing with sealed-in batteries
  • It can be free-standing or wall-mounted


  • The batteries may not be replaceable when dead
  • Linking multiple units may be difficult

Kidde 5CO (Best Value)

This model is excellent if you want a simple but highly functional safety device for your home. It has an easy control panel and button so anyone can set it up quickly and perform spot checks for CO levels.

The Kidde 5CO Carbon Monoxide Alarm has numerous features, including an early warning that will preemptively protect you from CO gas. The alarm is adequately loud, and the device also emits a flashing light for extra visibility.

This product has a 10-year lifespan and can either be stored on a unit, cupboard, or wall-mounted. It includes 2x AA batteries, a baseplate, and the required fixtures for mounting.


  • It has a 10-year alarm life using 2x AA batteries
  • This unit can be free-standing or wall-mounted
  • Continuous CO monitoring
  • Testing and reset functions
  • The model is easy to install and activate


  • Some customers have reported damaged units on delivery
  • The wall-mounting screws may be a little flimsy

Fireangel CO-9D (Best Dual Function)

This model is a brilliant option if you want a robust detector that will last for years. It has a sealed-in battery with a 7-year life, and its durable casing means you can easily use it as a portable device.

The Fireangel CO-9D is a dual-function detector due to its built-in thermometer, which is a valuable addition to CO detection. We like that it has a large LCD screen showing the current Carbon Monoxide level and the temperature. You can also see peak readings from the previous four weeks.

Inside the box, you get screws for wall-mounting, the alarm, and a comprehensive instruction manual. For compliancy, this carbon monoxide detector is certified to BS EN 50291 standards.


  • This unit has a loud alarm at 85dB
  • Large LCD screen with a thermometer
  • Automatic self-diagnostic check feature
  • Sealed batteries with a 7-year life
  • Certified to BS EN 50291


  • It may be difficult to remove the battery if it is faulty
  • The thermometer may sometimes be inaccurate

Kidde 10LLDCO (Best Loud)

If you have a hearing impairment or live on a large property, this carbon monoxide detector could be the perfect choice thanks to its loud 85dB alarm. This means that you should be able to hear it throughout your house.

The Kidde 10LLDCO Carbon Monoxide Alarm is a compact model with an overall length of 11cm. It also weighs only 0.16kg which means that it is easy to handle and could be wall-mounted quickly or stored in the optimum location.

This unit has a sealed-in battery that should have a life of 10 years. As a result, you can enjoy greater safety and less hassle in buying and swapping power items. We like that the digital display shows the active CO levels. The operation is also simple, with testing and reset features.


  • This unit is certified to EN 50291 standards
  • It includes a sealed battery with a 10-year life
  • Clear LED lights to show the CO detector status
  • Also has a testing function and reset feature
  • Small and compact design that you can store anywhere


  • The LCD display screen may be a little small
  • It could be tricky to replace faulty batteries

Scondaor 10-Year Sensor (Best for Readability)

If you struggle with vision and need a device that offers clear readouts, this CO detector is a brilliant option. It has a large backlit LED screen that shows current CO levels in a bold font. The display also shows the active battery life.

The Scondaor Carbon Monoxide Detector is a compact and lightweight unit at just 181g. Due to its size, you can easily store it in a cupboard. There is an optional wall-mounting plate on the rear that requires two screws.

The battery life is ten years which gives greater peace of mind. The detector has a loud alarm with a noise rating of 85dB and is also compliant with EN 50291 standards.


  • Reliable 10-year life with continuous detection
  • This model has an 85dB alarm and flashing LED
  • The clear LED screen shows a real-time CO reading
  • Has various warning signals relating to the battery
  • Small and lightweight design


  • The wall-mounting backing may be a little brittle
  • The instructions for mounting could be missing

HEIMAN 723ESY (Best With Mobile App)

If you want a detector in a fixed position in a known area that could have CO, this is a great option. It has a large and stable ceiling mounting plate. This feature makes the device flexible for different properties.

The HEIMAN 10-Year Life Carbon Monoxide Detector is also one of the few models with a mobile app, which is free to download and use. Thanks to this feature, you can quickly check the unit’s current status and CO levels.

In terms of usability and suitability, this CO detector has a 5-year battery life and is also certified to EN 50291 standards. If you want to do spot checks, there is an easy-to-use test button on the side.


  • Check alarm status via the mobile app
  • Battery operated with a 5-year product life
  • This model is certified to EN 50291 standards
  • Great for mounting to ceilings
  • It provides continuous CO monitoring


  • This detector may not be suitable for storing in a cupboard
  • It may not have the BS Kitemark, which means it could only be used in residential properties

How to Choose a Carbon Monoxide Detector

You should now have a great idea of the different safety devices available on the market. But which one is suitable for your property? Selecting the right model can be tricky, so we have created a simple buying guide below with the most important considerations.

Battery Life

One of the first things to look for is the battery life. Virtually all detectors are battery operated and not connected to a mains power outlet. Therefore, you ideally want one that lasts for a long time. This reduces the time and effort needed to continually replace the dead units. 

Today, most safety devices like these have an ultra-efficient power supply, and it is not uncommon to have a battery life of 10 years.

Standards Compliance

There is a variety of official standards for things like safety devices. Ideally, you want a carbon monoxide detector that is compliant with all relevant regulations. Primarily, you should know that the device is up to scratch and does what you intend. Secondly, for landlords and businesses, this is often a legal requirement. The associated standard for CO monitors is EN 50291.

Alert Method

Usually, this type of product will emit an alarm if carbon monoxide is detected. Ideally, this noise should be loud and consistent enough to hear anywhere on the property, giving you more chance to react, take action, and evacuate if necessary.

Some devices also send alerts to your smartphone or an associated mobile app. While this isn’t a necessity, it could be useful and give peace of mind when you are on holiday or away from the property.


Most carbon monoxide detectors are simple to use. You just insert the battery and turn it on. It then has to be placed in an ideal position. Most people put their units close to potential sources of CO, such as a heater.

Some devices also have testing features so you can check if the alarm goes off to locate the potential problem source. With this option, you usually walk around the property and press the test button – it will then detect CO levels accordingly.


Lastly, we also advise looking at the storage and mounting options of the carbon monoxide detector. There are usually two designs – wall-mounted or standalone.

Wall-mounted products allow you to secure the detector in a fixed position with a rear bracket: this could be a great idea if you have an area more susceptible to carbon monoxide gas. Standalone models give you flexibility and can easily be stored in something like a boiler cupboard or kitchen unit.


Our Editor’s choice is the X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Detector. This is a great pick if you want a single unit that detects both smoke and CO. It has 2-in-1 functionality and a clear LCD screen that lets you see the current status and levels. The 10-year battery is also superb and has an accurate detection system with no blind spots.

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