Carbon monoxide (CO) alarms are one of the most important safety devices in any UK home. Carbon monoxide is colourless, odourless and potentially fatal — which is why landlords are legally required to install CO alarms in many rental properties.
In this 2026 buyer’s guide, we cover:
- The best carbon monoxide alarms available in the UK
- Which type is right for your home
- UK safety standards to look for
- Typical price ranges
- Installation and maintenance tips
Quick Picks – Best Carbon Monoxide Alarms UK (2026)
| Product | Best For | Power Type | Approx Price |
|---|---|---|---|
| Kidde 10LLCO | Long battery life | Sealed lithium (10yr) | £20–£35 |
| FireAngel CO-9X10 | Rentals / compliance | Sealed 10yr battery | £18–£30 |
| Aico Ei208WRF | Interlinked systems | Sealed lithium | £45–£80 |
| X-Sense XC01 | Budget option | Replaceable battery | £15–£25 |
| Honeywell XC70 | Compact design | Sealed battery | £25–£40 |
All models listed comply with UK standards and are suitable for domestic use.
UK Carbon Monoxide Alarm Standards
When buying a CO alarm in the UK, look for compliance with:
- BS EN 50291 (European standard for CO alarms)
- CE or UKCA marking
For rental properties, compliance is especially important to meet landlord legal requirements.
If you’re unsure about your legal obligations, see our guide to carbon monoxide alarm legal requirements in the UK.
Types of Carbon Monoxide Alarms
1. Battery-Powered (Sealed 10-Year)
- No battery replacement required
- Ideal for landlords
- Long-term reliability
These are the most popular choice in the UK.
2. Replaceable Battery Models
- Lower upfront cost
- Requires yearly battery replacement
Suitable for homeowners comfortable with maintenance.
3. Interlinked CO Alarms
- Connect with smoke alarms
- Trigger all alarms when one detects danger
- Ideal for larger homes
Often used in Scotland where stricter interlinking rules apply.
Many homeowners install CO alarms alongside smoke alarms. See our guide to the best smoke alarms for UK homes for full coverage advice.
Carbon Monoxide Alarm Prices in the UK (2026)
| Alarm Type | Typical Price |
|---|---|
| Basic replaceable battery | £15–£25 |
| 10-year sealed battery | £18–£40 |
| Interlinked wireless | £45–£100+ |
CO alarms are inexpensive compared to the safety benefit they provide.
Where Should Carbon Monoxide Alarms Be Installed?
According to best practice guidance:
- In the same room as a fuel-burning appliance
- At least 15cm from the ceiling (wall-mounted)
- Away from bathrooms or kitchens
- Not directly beside boilers or fires
Always follow the manufacturer’s installation instructions.
Best Carbon Monoxide Alarms for Landlords
Landlords should prioritise:
- 10-year sealed battery models
- Certified to BS EN 50291
- Reliable brand manufacturers
- Easy test button access
Sealed battery models reduce tenant battery removal issues.
If you rent out property, make sure you understand the current carbon monoxide alarm legal requirements in the UK before choosing a model.
Landlords must also ensure they have a valid Energy Performance Certificate (EPC) when renting out property.
How to Choose the Right CO Alarm
Ask yourself:
- Is this for a rental property?
- Do I need interlinked alarms?
- Do I want 10-year maintenance-free battery?
- What rooms require protection?
For most UK homes, a sealed 10-year lithium battery model offers the best balance of safety and convenience.
Why Carbon Monoxide Alarms Matter
Carbon monoxide can leak from:
- Gas boilers
- Log burners
- Coal fires
- Oil heating systems
Properties with gas appliances must also have a valid gas safety certificate issued annually.
Symptoms of exposure include:
- Headaches
- Nausea
- Confusion
- Dizziness
Early detection can save lives.
How Often Should CO Alarms Be Replaced?
Most carbon monoxide alarms last:
- 7–10 years, depending on model
Even if batteries are working, the internal sensor degrades over time.
Always check the expiry date printed on the unit.
Final Thoughts
Choosing the best carbon monoxide alarm for your UK home doesn’t need to be complicated. Focus on:
- Certified UK standards
- Sealed 10-year battery models
- Reliable manufacturers
- Proper installation
Carbon monoxide alarms are one of the simplest, most cost-effective safety investments you can make.
Frequently Asked Questions
What is the best carbon monoxide alarm for UK homes?
The best carbon monoxide alarm depends on your home, but most UK households choose a sealed 10-year battery CO alarm for reliability and low maintenance.
What standard should a carbon monoxide alarm meet in the UK?
CO alarms sold for domestic use in the UK should meet BS EN 50291 and display UKCA or CE marking.
Do landlords need carbon monoxide alarms in the UK?
Yes. In many UK rental properties, landlords must install carbon monoxide alarms in rooms containing fixed combustion appliances such as boilers or solid-fuel burners.
Where should I install a carbon monoxide alarm?
A CO alarm should be installed in the same room as the fuel-burning appliance, following manufacturer guidance. Typically, wall-mounted alarms are placed at least 15cm below the ceiling.
How long do carbon monoxide alarms last?
Most carbon monoxide alarms last 7–10 years. After that, the sensor degrades and the unit should be replaced even if it still powers on.
Can carbon monoxide alarms be interlinked with smoke alarms?
Yes. Some CO alarms can be interlinked with smoke alarms so that if one alarm detects danger, all alarms sound together. This is useful for larger homes.