List of Discontinued Alarms & Replacements
Finding a replacement for your discontinued smoke or heat alarm can feel frustrating. Manufacturers stop making certain models, and you're left wondering which alarm will protect your property just as well, or better.
We've put together this guide to help you replace discontinued alarms without the guesswork.
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Finding the Right Replacement for Your Discontinued Alarm
Our list covers discontinued alarms from major manufacturers including Kidde, FireAngel, Ei Electronics, BRK and Firehawk. Need to replace a single alarm or update an entire property? We've matched each old model with a modern alternative that meets current UK fire safety standards.
You'll find replacements for popular discontinued models like:
- Kidde Firex smoke alarm range
- Ei151 and Ei156 series
- FireAngel ST-620 and ST-622 models
- BRK mains powered units
Each recommendation considers your original alarm type (ionisation, optical, heat or multi-sensor), how it's powered and whether it connects to other alarms. This ensures the new unit works with your existing system.
Expert Support for Discontinued Alarms and Their Replacements
Can't find your specific model on our list? Our UK customer service team can identify the perfect replacement for you.
Contact us on 0800 612 6537 or email us with your alarm's model number. We'll recommend the best modern alternative.
Replacing a Kidde KF1 Ionisation Smoke Alarm
These models can be replaced by the KF10 Replacement Smoke Alarm. The new units will work with the existing cable network so all you need to do is replace your baseplate.
We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Kidde KF1, Kidde KF1R, Kidde KF Series, Firex KF1
Discontinued:
October 2015
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Replacing a Kidde KF2 Optical Smoke Alarm
These models can be replaced by the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network so all you need to do is replace your baseplate.
We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Kidde KF2, Kidde KF2R, Kidde KF Series, Firex KF2
Discontinued:
October 2015
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Replacing a Kidde KF3 Heat Alarm
These models can be replaced by the KF20 Replacement Smoke Alarm. The new unit will work with the existing cable network so all you need to do is replace your baseplate.
We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Kidde KF3, Kidde KF3R, Kidde KF Series, Firex K32
Discontinued:
October 2015
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Replacing an Ei151 Ionisation Smoke Alarm
These models can be replaced by the Ei151RA. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Ei151, Ei151TL, Ei151TLH, Ei151TLR, Ei150
Discontinued:
September 2016
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Replacing an Ei156 Optical Smoke Alarm
These models can be replaced by the Ei156RA. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Ei156, Ei156TL, Ei156TLH, Ei156TLR, Ei150
Discontinued:
September 2016
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Replacing an Ei154 and Ei154TL Heat Alarm
These models can be replaced by the Ei154RA. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Product Codes:
Ei154, Ei154TL, Ei154TLH, Ei154TLR, Ei150
Discontinued:
September 2016
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Replacing an Ei131 Ionisation Smoke Alarm
This model can be replaced by the Ei3016 with Ei1516 masking plate. The new unit will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing an Ei136 Optical Smoke Alarm
This model can be replaced by the Ei3016 with Ei1516 masking plate. The new unit will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing an Ei134 Heat Alarm
This model can be replaced by the Ei144. The new unit will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing a Kidde 4870 or Kidde 4881 Ionisation Smoke Alarm
These models can be replaced by the KF10 Replacement Smoke Alarm. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing a Kidde 4973 or Kidde 4985 Optical Smoke Alarm
These models can be replaced by the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing a Kidde 4899 or Kidde 4982 Heat Alarm
These models can be replaced by the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network so all you need to do is replace your baseplate. We recommend asking an electrician to change the alarm as the cables will need to be wired into the new unit.
Replacing an Ei605TYC Optical Smoke Alarm with 10 Year Battery
This alarm can be replaced by the UltraFire ULLS10. The new units are standalone alarms powered by a 10-year longlife lithium battery, so an electrician is not needed for installation.
Replacing an Ei605TYCRF Radio-Interlink Optical Smoke Alarm with 10 Year Battery
This alarm can be replaced by the Ei650RF. The new units will work with the existing radio-interlink network and are powered by a 10-year longlife lithium battery, so an electrician is not needed for installation.
Replacing an Ei603TYC Heat Alarm with 10 Year Battery
This alarm can be replaced by the UltraFire ULLH10. The new units are standalone alarms powered by a 10-year longlife lithium battery, so an electrician is not needed for installation.
Replacing an Ei603TYCRF Radio-Interlink Heat Alarm with 10 Year Battery
This alarm can be replaced by the Ei603RF. The new units will work with the existing radio-interlink network and are powered by a 10-year longlife lithium battery, so an electrician is not needed for installation.
Replacing an Ei2110e - Multi-sensor Alarm with Lithium Backup Battery
This alarm can be replaced by the Ei3024. The new units will work with the existing hardwire interlink network and use the same base plate, so an electrician is not needed for installation.
Replacing an Ei2110eRF - Multi-sensor Alarm with Lithium Backup Battery & RadioLINK+
This alarm can be replaced by the Ei3024RF. The new units will work with the existing radio-interlink network and use the same base plate, so an electrician is not needed for installation.
Replacing a FireAngel SI-610 Ionisation Smoke Alarm
Buy our replacement smoke alarm for the SI-610. The replacement alarms fit the same base and also have a ten year lithium battery but have improved sensors, making them less sensitive to false alarms.
Replacing a FireAngel SO-601 Optical Smoke Alarm
Buy our replacement smoke alarm for the SO-601. The replacement alarms fit the same base and also have a ten year lithium battery but have improved sensors, making them less sensitive to false alarms.
Replacing a FireAngel ST-620 Thermoptek Smoke Alarm
Buy our replacement smoke alarm for the ST-620. The replacement alarms fit the same base and also have a ten year lithium battery but have improved sensors, making them less sensitive to false alarms.
Replacing a FireAngel ST-622 Thermoptek Smoke Alarm
Buy our replacement smoke alarm for the ST-622. The replacement alarms fit the same base and also have a ten year lithium battery but have improved sensors, making them less sensitive to false alarms.
Replacing a Ionisation Smoke Alarm with Escape Light - FireAngel LSI-601
Buy the FireAngel FA6611-R smoke alarm with escape light to replace the LSI-601. The replacement alarm fits the same base and has a 3 year battery life using 2x standard AA alkaline batteries.
Replacing a First Alert SA720CEUK Battery Optical Smoke Alarm with Escape Light
This alarm can be replaced by the FireAngel FAFA6611-R. The new units are standalone alarms powered by replaceable alkaline AA batteries, and feature an escape light.
Replacing a Mains Powered Optical Smoke Alarm - BRK 660MBX
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued 600MBX range is the Kidde Firex KF series.
Replacing a Mains Powered Smoke Alarm with Back-up - BRK 670MBX
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued 600MBX range is the Kidde Firex KF series.
Replacing a Mains Powered Heat Alarm - BRK 690MBX
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued 600MBX range is the Kidde Firex KF series.
Replacing a BRK 760MRL Mains Optical Smoke Alarm with Lifetime Back-up Battery
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued BRK 700MRL range is the Aico Ei3000 series.
Replacing a Mains Ionisation Smoke Alarm with Lifetime Back-up Battery - BRK 770MRL
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued BRK 700MRL range is the Aico Ei3000 series.
Replacing a Mains Powered Heat Alarm with Sealed Lifetime Back-up Battery - BRK 790MRL
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued BRK 700MRL range is the Aico Ei3000 series.