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 list of discontinued alarms and replacements 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
- Ei151 and Ei156 series
- FireAngel ST-620 and ST-622 models
- BRK 660MBX, 670MBX, and 690MBX 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.
Discontinued Kidde Alarms
Replacing a Kidde KF1 Ionisation Smoke Alarm
The Kidde KF1 can be replaced with the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde KF1R Ionisation Smoke Alarm
The Kidde KF1R can be replaced with the KF20R Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Firex KF1 Ionisation Smoke Alarm
The Firex KF1 can be replaced with the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde KF2 Optical Smoke Alarm
The Kidde KF2 can be replaced with the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde KF2R Optical Smoke Alarm
The Kidde KF2R can be replaced with the KF20R Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Firex KF2 Optical Smoke Alarm
The Firex KF2 can be replaced with the KF20 Replacement Smoke Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde KF3 Heat Alarm
The Kidde KF3 can be replaced with the KF30 Replacement Heat Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde KF3R Heat Alarm
The Kidde KF3R can be replaced with the KF30R Replacement Heat Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Firex KF3 Heat Alarm
The Firex KF3 can be replaced with the KF30 Replacement Heat Alarm. The new units will work with the existing cable network and the new alarm will also fit on your existing baseplate.
Replacing a Kidde 4870 Ionisation Smoke Alarm
The Kidde 4870 can be replaced with 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 4881 Ionisation Smoke Alarm
The Kidde 4881 can be replaced with 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 1240C Ionisation Smoke Alarm
The Kidde 1240C can be replaced with 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 120-1123 Ionisation Smoke Alarm
The Kidde 120-1123 can be replaced with 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 Optical Smoke Alarm
The Kidde 4973 can be replaced with 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 4985 Optical Smoke Alarm
The Kidde 4985 can be replaced with 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 PAR230C Optical Smoke Alarm
The Kidde PAR230C can be replaced with 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 Heat Alarm
The Kidde 4899 can be replaced with the KF30 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 4982 Heat Alarm
The Kidde 4982 can be replaced with the KF30 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.
Discontinued Ei Electronics / Aico Alarms
Replacing an Ei151 Ionisation Smoke Alarm
The Ei151 can be replaced with 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.
Replacing an Ei151TL Ionisation Smoke Alarm
The Ei151TL can be replaced with 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.
Replacing an Ei151TLH Ionisation Smoke Alarm
The Ei151TLH can be replaced with 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.
Replacing an Ei151TLR Ionisation Smoke Alarm
The Ei151TLR can be replaced with 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.
Replacing an Ei156 Optical Smoke Alarm
These models can be replaced with 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.
Replacing an Ei156TL Optical Smoke Alarm
The Ei156TL can be replaced with 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.
Replacing an Ei156TLH Optical Smoke Alarm
The Ei156TLH can be replaced with 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.
Replacing an Ei156TLR Optical Smoke Alarm
The Ei156TLR can be replaced with 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.
Replacing an Ei154 Heat Alarm
The Ei154 can be replaced with 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.
Replacing an Ei154TL Heat Alarm
The Ei154TL can be replaced with 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.
Replacing an Ei154TLH Heat Alarm
The Ei154TLH can be replaced with 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.
Replacing an Ei154TLR Heat Alarm
The Ei154TLR can be replaced with 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.
Replacing an Ei131 Ionisation Smoke Alarm
The Ei131 can be replaced with 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
The Ei136 can be replaced with 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
The Ei134 can be replaced with 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 an Ei605TYC Optical Smoke Alarm with 10 Year Battery
The Ei605TYC can be replaced with the Ei650. The new units are standalone alarms powered by a 10-year longlife lithium battery, so an electrician is not needed for installation.
Replacing an Ei605CRF Optical Smoke Alarm with 10 Year Battery
The Ei605CRF can be replaced with 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 Ei605TYCRF Optical Smoke Alarm with 10 Year Battery
This alarm can be replaced with 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 Ei603C Heat Alarm with 10 Year Battery
The Ei603C can be replaced with the Ei630iRF. 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
The Ei603TYCRF can be replaced with the Ei630iRF. 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
The Ei603TYC can be replaced with the Ei630iRF. The new units are standalone alarms 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 with 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 with 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 an Ei2110RF - Multi-sensor Alarm with Lithium Backup Battery & RadioLINK+
The Ei2110RF can be replaced with 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.
Discontinued FireAngel Alarms
Replacing a FireAngel SI-610 Ionisation Smoke Alarm
This alarm can be replaced with the FireAngel FA6620-R. 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
This alarm can be replaced with the FireAngel FA6620-R. 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
This alarm can be replaced with the FireAngel FA6620-R. 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
This alarm can be replaced with the FireAngel FA6620-R. 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.
Discontinued First Alert Alarms
Replacing a First Alert SA720CEUK Battery Optical Smoke Alarm with Escape Light
This alarm can be replaced with the FireAngel FAFA6611-R. The new units are standalone alarms powered by replaceable alkaline AA batteries, and feature an escape light.
Discontinued BRK Alarms
Replacing a BRK 660MBX Mains Powered Optical Smoke Alarm
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKSM.
Replacing a BRK 760MBX Mains Powered Optical Smoke Alarm
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKSM.
Replacing a BRK 670MBX Mains Powered Smoke Alarm with Back-up
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKSM.
Replacing a BRK 770MBX Mains Powered Smoke Alarm with Back-up
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKSM.
Replacing a BRK 690MBX Mains Powered Heat Alarm
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKHE.
Replacing a BRK 790MBX Mains Powered Heat Alarm
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. This alarm can be replaced with the Easichange SBBRKHE.
Replacing a BRK 660MRL 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 600MRL & 700MRL ranges is the Kidde KF21R.
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 600MRL & 700MRL ranges is the Kidde KF21R.
Replacing a BRK 670MRL Mains Ionisation 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 600MRL & 700MRL ranges is the Kidde KF21R.
Replacing a BRK 770MRL Mains Ionisation 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 600MRL & 700MRL ranges is the Kidde KF21R.
Replacing a Mains Powered Heat Alarm with Sealed Lifetime Back-up Battery - BRK 690MRL
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 600MRL & 700MRL range is the Kidde KF31R.
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 600MRL & 700MRL range is the Kidde KF31R.
Our articles are reviewed regularly. However, any changes made to standards or legislation following the review date will not have been considered. Please note that we provide abridged, easy-to-understand guidance. To make detailed decisions about your fire safety provisions, you might require further advice or need to consult the full standards and legislation.
Doc: 314 | Last Updated at: 2026-09-13 11:37:44