Best Smoke & Carbon Monoxide Alarms — Budget + 5 years (2026)

1 smoke & carbon monoxide alarms matching price tier “Budget” + warranty “5 years”, hand-picked from UK Amazon listings.

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• 5 years×Remove warranty filter

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.

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#1 Pick

Ei Electronics Ei650i Optical Smoke Alarm, White

Rated 4.6 out of 5 stars (567)

• Standalone
• 5 years

£24.20

Pros

• Continuous self-check reduces false alarms
• Easy to install with test button
• Trusted Ei Electronics/Aico safety brand

Cons

• Standalone unit, no wireless interlink

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