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Mains Smoke Alarms
Most existing properties will need Grade D alarms according to previous Building Regulations. This means that they must have one or more mains powered smoke detector, each with a back-up battery. New residential buildings, conversions, HMOs, and some small businesses require mains powered interlinked smoke alarms. We supply a variety of 230V powered smoke detectors and heat alarms with wire interlink or radio interlink between units from leading brands such as Kidde, Firehawk, Hispec, FireAngel, and AICO.
All of the detectors in this section fulfil the requirements of BS 5839 Part 6, and satisfy Grades D1 & D2 from the new 2019 revision. Please see our guide to BS 5839-6: 2019 for more information on the difference in Grades of fire alarm systems.
Mains Powered 2 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Battery - Kidde Firex KF Series
- Power: 230V mains powered with alkaline back-up battery
- Back-up Battery: 9V alkaline battery (included)
- Warranty: 6 year warranty
- Hardwire interlink with up to 24 devices
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Firehawk BB Series
These Firehawk mains-powered smoke and heat alarms with hardwire interlink and replaceable AAA alkaline back-up batteries are suitable for Grade D2 systems to warn all occupants of a fire.
- 230V mains power with alkaline battery backup
- 6 years manufacturer's warranty
- Hardwire interlink up to 15 Firehawk FHN smoke and heat alarms.
- Also suitable for the 2022 Scottish legislation
Mains Powered 2 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Batteries - Firehawk
- Power: 230V mains powered with alkaline back-up battery
- Back-up Battery: 3 x AAA alkaline batteries (included)
- Warranty: 6 year manufacturer's warranty
- Hardwire interlink with up to 12 Firehawk FHN devices in total
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Batteries - Firehawk
- Power: 230V mains powered with alkaline back-up battery
- Back-up Battery: 3 x AAA alkaline batteries (included)
- Warranty: 6 year manufacturer's warranty
- Hardwire interlink with up to 12 Firehawk FHN devices in total
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - FireAngel W1-R Series
- Power: 230V mains powered with battery back-up
- Backup Battery: 9V alkaline battery (included)
- Warranty: 1 year warranty
- Available in Optical and Heat versions
- Interlinks with up to 12 units
- Kitemarked, CE marked and suitable for BS 5839-6: 2019 Grade D2
- Please note: alarms are sold individually
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Kidde Firex KF Series
- 230V mains powered with alkaline back-up battery
- Available in Optical and Heat versions
- Interlink with up to 24 units
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Kitemarked and CE marked
- Please note: alarms are sold individually
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Battery - Kidde Firex KF Series
- Power: 230V mains powered with alkaline back-up battery
- Back-up Battery: 9V alkaline battery (included)
- Warranty: 6 year warranty
- Hardwire interlink with up to 24 devices
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Aico Ei140e Series
- 230V mains powered with alkaline back-up battery
- Available in Optical and Heat versions (Ei146e, Ei144e)
- Made in Ireland by Ei Electronics
- Interlinks with up to 12 units
- Kitemarked, CE marked and suitable for BS 5839-6: 2019 Grade D2 installations
- Please note: Alarms are sold individually
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Aico Ei3000 Series
- Available in Optical, Heat, Combined Optical & Heat, and Combined Heat & CO
- Mains powered alarms with sealed lithium back-up battery
- AudioLINK technology fitted as standard
- Interlinks with up to 12 compatible devices
- Compatible with Ei3000MRF SmartLINK Module for radio-interlinking
- Suitable for BS 5839-6: 2019 Grade D1 installations
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Firehawk RB Series
With self-charging back-up batteries, these mains-powered smoke and heat alarms from Firehawk won't need new batteries for their full 10 year lifespan. Ideal for Grade D1 and Scottish installations.
- 230V mains power with self-charging lithium battery backup
- 10 years manufacturer's warranty
- Hardwire interlink up to 15 Firehawk smoke and heat alarms.
- Also suitable for the 2022 Scottish legislation
Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series
- 230V mains powered with self-charging lithium back-up battery
- Available in Optical and Heat versions
- Interlinks with up to 24 units
- Suitable for BS 5839-6: 2013 Grade D1installations
- Kitemarked and CE marked
- Also suitable for both the Welsh and Scottish 2022 legislation
Mains Powered 2 Smoke Alarms and 1 Heat Alarm Kit with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series
- Power: 230V mains powered with self-charging lithium back-up battery
- Back-up Battery: Self-charging 10 year back-up battery
- Warranty: 6 year warranty
- Hardwire interlink up to 24 compatible devices
- Suitable for BS 5839-6: 2019 Grade D1 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series
- Power: 230V mains powered with self-charging lithium back-up battery
- Back-up Battery: Self-charging 10 year back-up battery
- Warranty: 6 year warranty
- Hardwire interlink up to 24 compatible devices
- Suitable for BS 5839-6: 2019 Grade D1 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Battery - Aico Ei140e Series
- Power: 230V mains powered with alkaline back-up battery
- Warranty: 5 year warranty
- 3 x optical smoke alarms and 1 x heat alarm included in the kit
- Central test and hush buttons
- Hardwire interlink with up to 12 devices
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Powered 2 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Battery - Aico Ei140e Series
- Power: 230V mains powered with alkaline back-up battery
- Warranty: 5 year warranty
- 2 x optical smoke alarms and 1 x heat alarm included
- Test and hush buttons
- Hardwire interlink with up to 12 devices
- Suitable for BS 5839-6: 2019 Grade D2 installations
- Compliant with Scottish 2022, Welsh Landlord 2022, and Northern Ireland Landlord 2024 legislation
Mains Smoke Alarms
Back-Up Batteries
Mains Smoke Alarms
Mains smoke alarms or mains powered smoke alarms are powered by the 230V from the mains wiring of the building. While replacement units and batteries can be easily changed, all wiring work should be completed by a competent person, such as an electrician, to ensure that it is safe and has been installed correctly. Mains smoke alarms can be wired into a special alarm wiring loop, which comes directly from the fuse box, or they can be fed from the nearest light fitting.
Retrofitting mains powered smoke alarms in older buildings, means that supply from a light fitting is often recommended and cheaper. However, care must be taken to ensure that the supply is wired correctly, and that the smoke alarm is not supplied by a ‘switched’ electric cable. Being wired to a ‘switched’ cable means that when in the ‘off’ position, the alarm may not function as it should and be only functional on its back-up battery. This is particularly problematic for sealed (Grade D1) smoke and heat alarms, as the battery cannot be changed, so the whole unit will need to be replaced if the battery is over-used.
Mains smoke alarms with any form of interlink (either hard-wired or using radio-interlink) fulfil BS5839-6 Grade D, which is required for extensions, new domestic buildings, let homes, HMOs, and many more applications.
Back-Up Batteries
All of our mains powered smoke detectors and heat alarms have back-up batteries, and therefore meet the Grade D requirements. Back-up batteries offer additional protection, by ensuring that the smoke and heat alarms still have a power supply, even if the mains power fails. Alarms with back-up batteries are either tamper proof devices for which the batteries last the lifetime of the alarm, or have and accessible battery compartment for the user to replace the alarms batteries within the alarm’s lifetime.
Replaceable back-up batteries (Grade D2):
These back-up batteries are often non-rechargeable, and specified as alkaline by the manufacturer. Usually, these require replacement every year or two, depending on how often they are used.
Non-replaceable back-up batteries (Grade D1):
These back-up batteries are a sealed-in rechargeable lithium cell, also known as a tamper-proof battery, which is designed to last the lifespan of the alarm. This type of back-up batteries are designed to trickle charge while there are connected to mains power and to provide full power, if the mains were to fail. These alarms are often found most useful in rented properties, in order to avoid tampering, deactivation, and the requirement for battery changes falling on the tenant.
Whether purchasing alarms fulfilling to Grade D1 or D2, the lifespan of any smoke or heat detector will usually be up to 10 years; the whole alarm must be replaced at this point. This is due to the sensor becoming less reliable, and more likely to falsely alarm.