Best Smoke & Carbon Monoxide Alarms — Mains-wired (2026)
1 smoke & carbon monoxide alarms matching connectivity “Mains-wired”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Kidde 7DCOC Carbon Monoxide Alarm, White vs FireAngel FA6120-INT-T2 Smoke Alarm Detector, White: Which Smoke & Carbon Monoxide Alarms Is Better? guide.
Protect your home with mains-wired Smoke & Carbon Monoxide alarms – a vital component of any comprehensive fire safety plan. These alarms are designed for robust, reliable protection and offer the highest level of security by directly connecting to your electricity supply, eliminating the need for batteries and ensuring continuous operation. Unlike battery-powered models, these alarms provide uninterrupted detection, crucial during power outages or extended periods without replacement batteries.
For maximum effectiveness, mains-wired alarms should be installed in accordance with building regulations and manufacturer guidelines, typically within each bedroom and on every floor of your property. They are easily integrated into existing electrical systems and offer a dependable alert system that will immediately notify you of smoke or dangerous carbon monoxide levels. Choosing this connectivity type ensures immediate and consistent performance for critical safety.
These alarms provide peace of mind knowing that you have a reliable detection system ready to respond swiftly. Remember to regularly test your alarms and replace them every ten years as recommended by current UK fire safety standards. Selecting mains-wired models guarantees the long-term functionality needed for safeguarding your family’s well-being.
#1 Pick
Aico Ei3028 Mains Powered Multi-Sensor Heat & Carbon Monoxide Alarm- Mains-wired
- 5 years
£66.62
Pros
- Combines heat and CO sensing in one mains-powered unit
- Rechargeable lithium back-up keeps it working in a power cut
- Energy Class A+ rated
Cons
- Mains wiring installation, not a simple battery unit
FAQ
What does 'mains-wired' mean in relation to smoke alarms?+
‘Mains-wired’ means the alarm is directly connected to your home’s electrical supply via a hardwire connection. This provides continuous power, eliminating battery maintenance and guaranteeing 24/7 operation.
Do I need specific wiring for mains-wired alarms?+
Yes, you'll require suitable multi-core cable (typically LS01 or similar) to connect the alarm to your existing electrical circuit. It’s advisable to consult an electrician for installation to ensure correct connections and compliance with regulations.
Can I install a mains-wired alarm myself?+
While DIY installation is possible, we strongly recommend hiring a qualified electrician. Incorrect wiring can be dangerous and may invalidate the warranty provided by the manufacturer.
How many alarms do I need for a typical house?+
Building regulations typically require at least one mains-wired smoke alarm on each storey of your home and outside sleeping areas. It’s also advisable to include a carbon monoxide alarm, particularly near fuel-burning appliances.
What happens if the power goes out?+
Mains-wired alarms continue to operate as long as there is electricity in your property. They are unaffected by standard power outages.
How often should I test a mains-wired alarm?+
Test your mains-wired smoke and carbon monoxide alarms at least once a week, using the test button, to ensure they are functioning correctly.
What if my alarm doesn’t sound?+
First, check that the alarm is receiving power. If it is, there may be a fault within the sensor; contact the manufacturer for troubleshooting or replacement options as outlined in their warranty details.
Are carbon monoxide alarms essential with mains-wired smoke alarms?+
Carbon monoxide (CO) is a silent killer, and CO alarms are crucial alongside smoke alarms. They detect the presence of this dangerous gas, which can build up from faulty appliances like boilers or fireplaces.
What type of cable should I use for connecting my alarm?+
You'll need LS01 multi-core cable (or equivalent) that is rated to carry the current required by your alarm. Ensure the cable length is sufficient for a secure connection and complies with building regulations.
How do I ensure my alarms are compliant with UK fire safety standards?+
Install your mains-wired alarms according to Building Regulations Part L1 (Fire Safety) and manufacturer’s instructions. Regular testing and maintenance, along with replacement every 10 years, are crucial for compliance.