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Replacement Smoke and Heat Alarms

Smoke alarms and heat alarms need to be replaced after 10 years. In that time manufacturers often discontinue and update their ranges, making the selection of your replacements a difficult choice. The alarms below have been carefully researched and chosen as the most suitable substitutes for your outgoing detectors. In most cases they can be installed on the very same base as your old alarm and will be fully compatible with any interlinking system that you already have in place. These units can usually be removed and replaced by the user without the need for an electrician.

Please Note: In some cases the manufacturer discontinues the base as well as the alarm itself. The replacement of mains powered alarm bases will require the skills of an electrician, but any existing interlink can typically be preserved even between old and new models. This ensures that your new alarm will continue to work with the rest of your alarm system and enable you to replace a single alarm without worrying about compatibility.

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Replacement for Ei151 Mains Powered Smoke Alarm

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Alarm test and silence button
  • Optical sensor technology for fewer false alarms
  • LED power and function indicators
  • Kitemarked to BS EN 14604: 2005
191 Customer Reviews

From: £45.59 inc VAT

£37.99 ex VAT

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Replacement for Ei154 Mains Powered Heat Alarm

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Test and hush button feature
  • Heat sensor for use where smoke alarms cannot be fitted
  • LED power and function indicators
  • Kitemarked to BS 5446-2: 2003
8 Customer Reviews

From: £46.79 inc VAT

£38.99 ex VAT

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Replacement for Ei156 Mains Powered Smoke Alarm

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Test and hush button feature
  • Optical sensor technology to reduce nuisance alarms
  • Replacement alarm base and fixings included
  • Kitemarked to BS EN 14604: 2005
45 Customer Reviews

£45.59 inc VAT

£37.99 ex VAT

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Replacement for Ei161, Ei161RC and Ei161e Mains Powered Smoke Alarms

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Fits onto your existing Ei161 smoke alarm base
  • Fully compatible replacement for Ei161 smoke alarms
  • Upgrade to optical sensor technology for fewer false alarms
  • Kitemarked to BS EN 14604: 2005
56 Customer Reviews

£45.59 inc VAT

£37.99 ex VAT

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Replacement for Ei164, Ei164RC and Ei164e Mains Powered Heat Alarms

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Fits directly onto your current Ei164 heat alarm base
  • Fully compatible replacement for all Ei164 heat alarms
  • Ideal for kitchens, lofts, garages and workshops
  • Kitemarked to BS 5446-2: 2003
22 Customer Reviews

£46.79 inc VAT

£38.99 ex VAT

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Replacement for Ei166, Ei166RC and Ei166e Mains Powered Smoke Alarms

  • Power: 230V mains with back-up battery
  • Back-up Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Fits onto your existing Ei166 smoke alarm base
  • Fully compatible replacement for Ei166 smoke alarms
  • Improved optical sensor technology for fewer false alarms
  • Kitemarked to BS EN 14604: 2005
48 Customer Reviews

£45.59 inc VAT

£37.99 ex VAT

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Replacement for BRK 670MBX Mains Powered Smoke Alarm

  • Fully compatible replacement kit for BRK 670MBX
  • Identical BRK ionisation smoke alarm
  • Power: 230V mains with 9V alkaline battery backup
  • Simple DIY replacement process using existing base plate
  • Replacement alarm fully conforms to the latest British Standards
  • Warranty: 5 year manufacturer's warranty

£19.56 inc VAT

£16.30 ex VAT

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Replacement for BRK 770MBX Mains Powered Smoke Alarm

  • Fully compatible replacement kit for BRK 770MBX
  • Identical BRK ionisation smoke alarm head
  • Power: 230V mains with 9V alkaline battery backup
  • Simple DIY replacement process using existing base plate
  • Replacement alarm fully conforms to the latest British Standards
  • Warranty: 5 year manufacturer's warranty

£19.56 inc VAT

£16.30 ex VAT

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Replacement for DETA 1111 Mains Powered Smoke Alarms

  • Power: 230V mains with back-up battery
  • Back-up Battery: 9V alkaline back-up battery (included)
  • Warranty: 5 year manufacturer's warranty
  • Fully compatible replacement for DETA 111 smoke alarms
  • Fits onto your existing alarm base – no electrician needed
  • Ionisation sensor technology
  • Kitemarked to BS EN 14604: 2005
2 Customer Reviews

£19.56 inc VAT

£16.30 ex VAT

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Replacement for DETA 1151 Mains Powered Smoke Alarm

  • Power: 230V mains with back-up battery
  • Back-up Battery: 9V alkaline back-up battery (included)
  • Warranty: 5 year manufacturer's warranty
  • Fully compatible replacement for the DETA 151 smoke alarm
  • Fits directly onto your existing alarm base – no addition wiring needed
  • Ionisation smoke sensor technology
  • Kitemarked to BS EN 14604: 2005
4 Customer Reviews

£19.56 inc VAT

£16.30 ex VAT

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Replacement for FireAngel SI-610 10 Year Smoke Alarm

  • FREE delivery
  • Battery: Built-in, lasts the lifetime of your alarm
  • Warranty: 5 year warranty
  • Test and hush button feature
  • Toast proof sensor - less prone to false alarms
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Kitemarked to BS EN 14604: 2005
211 Customer Reviews

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Now: £13.98 inc VAT

£11.65 ex VAT

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Replacement for FireAngel SO-601 9V Optical Smoke Alarm

  • FREE delivery
  • Battery: Built-in, lasts the lifetime of your alarm
  • Warranty: 5 year warranty
  • Test and hush button feature
  • Thermoptek optical smoke sensing technology
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Kitemarked to BS EN 14604: 2005
79 Customer Reviews

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Now: £13.98 inc VAT

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Replacement for FireAngel ST-620 10 Year Smoke Alarm

  • FREE delivery
  • Battery: Built-in, lasts the lifetime of your alarm
  • Warranty: 5 year warranty
  • Combined smoke and heat alarm (Thermoptek)
  • Test and hush button feature
  • Suitable for BS 5839-6: 2019 Grade F1 installations
  • Kitemarked to BS EN 14604: 2005
374 Customer Reviews

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Now: £13.98 inc VAT

£11.65 ex VAT

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Why do Smoke Alarms have to be replaced after 10 Years?

Why do Smoke Alarms have to be replaced after 10 Years?

A number of studies assessesd the impact of ageing on smoke alarms. A nationwide study was undertaken by the Consumer Product Safety Commission (CPSC) in the USA and found that after ten years only 73% of smoke alarms was still working. Ageing alarms may experience sensitivity drifting, which may, in turn, result in an increased frequency of accidental activation.

Canada’s Ontario Housing Corporation carried out a study supporting saying that after 30 years, nearly all the smoke alarms will have failed. They conclude that replacement after ten years, with roughly a 30% probability of failure, is an appropriate balance between safety and cost.

All our manufacturers recommend a replacement of the smoke alarms (or at least of the smoke alarm heads) every 10 years.