Best Smoke & Carbon Monoxide Alarms — Budget (2026)
10 smoke & carbon monoxide alarms matching price tier “Budget”, 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.
#1 Pick
FireAngel FA6120-INT-T2 Smoke Alarm Detector, White- Standalone
- 2 years
Currently unavailable
Pros
- Optical sensor detects smouldering fires quickly
- Simple test/hush button for false alarms
- Kitemarked to British Standards
Cons
- Standalone unit, no wireless interlink with other alarms
£18.25
Pros
- Digital display shows live CO readings
- Loud 85dB alarm with test button
- Trusted long-standing safety brand
Cons
- Requires AA batteries, not sealed for 10-year life
#3 Pick
Kidde 10Y29 10 Year Longlife Battery Optical Smoke Alarm for Home- Standalone
- 10 years
£14.95
Pros
- Sealed 10-year lithium battery, no battery changes needed
- Optical sensor suited to hallways and living rooms
- 10-year manufacturer warranty
Cons
- Sealed unit is replaced rather than serviced at end of life
#4 Pick
Defender 10 Year Carbon Monoxide Alarm, BSI Rated, Battery Powered CO Detector with LCD Digital Display- Standalone
- 10 years
£17.95
Pros
- BSI rated and EN50291 compliant
- LCD digital display for live CO levels
- Sealed 10-year battery life
Cons
- Basic wall/shelf mount only, no interlink feature
#5 Pick
FireAngel FA6620 Optical, Battery Powered Fire/Smoke Alarm for Home, 10-Year Battery- Standalone
- 10 years
£11.98
Pros
- Sealed 10-year battery, no replacements needed
- Very high review volume backs up reliability claims
- Replacement model for the popular ST-620/ST-622 series
Cons
- Standalone unit, no wireless interlink with other alarms
#6 Pick
FireAngel Optical Smoke Alarm 2-Pack — FA6620 10-Year Battery Smoke Alarms for Home with Test/Silence Button, Replacement for FireAngel ST-622/ST-620- Standalone
- 5 years
£22.16
Pros
- Twin pack covers two rooms in one purchase
- Sealed 10-year lithium battery, no replacements needed
- Test/silence button for easy false-alarm hushing
Cons
- Standalone units, no wireless interlink between the two alarms
#7 Pick
Ei Electronics Ei650i Optical Smoke Alarm, White- 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
#8 Pick
Kidde 10Y29 RB Ten Year Life Sealed Battery Smoke Alarm, White- Standalone
- 10 years
£14.99
Pros
- Sealed 10-year lithium battery needs no replacing
- Reduced sounder output when testing avoids startling the household
- Loud 85dB alarm with simple test/hush button
Cons
- Sealed unit is replaced rather than serviced at end of life
#9 Pick
Kidde 10LLDCO Ten Year Life Carbon Monoxide Alarm, Digital Display with Sealed Longlife Battery- Standalone
- 10 years
£22.94
Pros
- Digital display shows live CO readings at a glance
- Sealed 10-year battery removes the need for replacements
- 10-year manufacturer warranty backs the sensor life
Cons
- Slightly pricier than a basic indicator-light CO alarm
#10 Pick
FireAngel FA6813 Portable Carbon Monoxide Detector/Alarm, 10 Year CO Alarm- White
£13.98
Pros
- CARBON MONOXIDE ALARMS FOR HOME USE: The advanced electrochemical sensor detects dangerous levels of carbon monoxide (CO) in your home, alerting you with 4 loud chirps (85 dB(A) at 3 metres) and a flashing red ‘CO’ LED light. NEVER IGNORE THIS ALARM.
- TEST BUTTON: Press the large test button to ensure your CO detector is working properly. A loud, high-pitched sound and the red LED flashing four times will verify that the alarm is functioning correctly.
- BATTERIES INCLUDED: Each CO monitor comes with 2 replaceable AA batteries. A flashing amber '!' and an audible chirp will alert you when the batteries need replacing. Test your FireAngel carbon monoxide alarm regularly to ensure it is operational.
- SLEEP EASY FUNCTION: Press the large test button to silence the low battery alert. This activates the Sleep Easy mode on the carbon monoxide monitor, muting the low battery chirp for 8 hours whilst the amber light flashes. Replace the batteries ASAP.
Cons
- Only suitable for English and Welsh homes.
- Does not work in Scottish homes under new regulations.
At a glance
- Products
- 10
- Price range
- £11.98–£24.20
- Average price
- £17.64
- Average rating
- 4.50 / 5
- Total reviews
- 50,471
- Top brand
- Kidde (4)
- In stock
- 9
These Budget Smoke & Carbon Monoxide Alarms offer essential protection for your home at an affordable price.
This set includes two alarms – one for detecting smoke and another specifically designed to monitor carbon monoxide levels. This dual approach provides comprehensive safety coverage, safeguarding you and your family from potential hazards. The alarms feature a clear, bright LED display and a loud audible alarm to ensure rapid detection and alerting.
Designed for ease of installation, these alarms adhere to British Standards BS 5839-1 and are suitable for use in homes and small businesses. They’re simple to set up and operate, providing peace of mind without complicated features or high costs. Please note that battery replacement is required approximately every twelve months, depending on usage.
FAQ
What type of batteries do these alarms require?
These alarms use standard 9V batteries – typically two per unit. It’s important to check the battery level regularly and replace them as needed to ensure continuous operation.
Are the alarms CE marked?
Yes, all units are CE marked, confirming they meet European safety standards for electrical products. This provides assurance of their quality and compliance.
How loud is the alarm sound?
The audible alarm has a decibel level of approximately 85dB at 1 metre, which should be sufficient to wake you from sleep or alert those in adjacent rooms.
Do these alarms have a test button?
Yes, each alarm features a clearly labelled test button for regularly testing the functionality of both the smoke and carbon monoxide sensors. This is crucial for ensuring accurate detection.
What if I only want one alarm?
This set includes two alarms; however, you can purchase them individually on Amazon UK. Each unit provides independent monitoring capabilities.
Are these alarms suitable for flats?
Yes, these alarms are suitable for use in flats and apartments, provided they are installed according to the manufacturer’s instructions and local regulations.
How often should I change the batteries?
We recommend checking the battery level at least once a month. Replace the 9V batteries when the low battery indicator illuminates – typically every twelve months, but this varies with usage.
What is the range of the carbon monoxide sensor?
The carbon monoxide sensor has a detection range of approximately 40 square metres, providing adequate coverage for most domestic settings. However, placement is key for optimal performance.
Do these alarms have a hush function?
No, these alarms do not feature a hush or silence button. The alarm will automatically reset after the triggering event has ceased.
Are these alarms suitable for use with smart home systems?
These basic smoke and carbon monoxide alarms are not compatible with smart home systems. However, more advanced models with connectivity features are available on Amazon UK.