Lumi-Heat® replacement

Mains heat alarm replacement


£65.24 ex VAT

World’s smallest mains-powered recessed heat alarm replacement. Replace to ensure your home is safe.

Blends in seamlessly for discreet but complete, fully fire-rated safety.

Reliable connectivity to our smoke alarms to offer full coverage.

10-year sealed battery and back-up for safety that stands up.

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It’ll only beep when you need a replacement or if there is an emergency.

Replace the world’s smallest heat alarm to keep your home safe and ceilings clutter free. Our heat alarms have a non-replaceable battery that will last up to 10 years. When the battery is reaching the end of its life, a short beep will sound out every 48 seconds for 30 days. This is your tune to replace your alarm.



110V AC, 230V AC

Battery type

Non-replaceable CR2 10-year battery

Interlink frequency


Operating humidity

-10ºC to + 70ºC

Power consumption

145mAh in non-alarm condition


Audible indicator minimum 85dB @ 3 metres in anechoic successive tones


30/60/90 - Solid Joist 30 - Metal Webbed Joist & I-Joist

Complies to

BS 5839: Part 6 Grade D1

Product colour



Cut-out size








Important bits.

Here you can find all the information you need to achieve streamlined results.

Design files.

.RFA, .LDT, and .IES files to help streamline your design.


Every product detail on one useful, downloadable datasheet.

Install sheet.

Download the installation sheet for all our technical know-how.

Test certification.

All our official certifications, ready for you to download.


At Lumi-Plugin® we believe everybody deserves beauty and safety in their home.
We are proud of our almost non-existent failure rate which is why our heat alarm comes with a 5-year guarantee.


  • What makes the Lumi-Heat® alarm different?

    It’s the world’s smallest mains powered heat alarm with the option to integrate lighting, to keep your space bright, beautiful and most importantly- safe. We can do this by hiding all the technology behind our fully fire rated chassis, keeping functionality in great working and great looking condition.

  • Is the Lumi-Heat®alarm as safe as ordinary heat alarms?

    Yes. All our products including our heat alarm are fully accredited and certified by third-party regulators to ensure peace of mind across your entire home. Our heat alarm is more discreet but no less complete, making your space safe and stylish.

  • Is it ok to have heat alarms close to lights?

    Yes. There is a myth from traditional fittings that this is not possible. However, our heat alarm plugin has been tested so the alarms detects and functions perfectly with or without the optional light fittings in place. If your electrician has any queries please get them to contact us on or +44 (0) 3303 801 329 and we will be happy to answer any questions they may have.

  • If the Lumi-Heat®alarm fails do I have to replace the whole fixture?

    No. We’ve designed the product so you just replace the part you need. You can replace the heat alarm by adding this product to your basket and the light source here. However, our light has a 5 year use non-stop life cycle or 50,000 hours and our heat alarm has a 10 year life so you don’t need to worry about this for a while.

  • Where would I need a heat alarm in my home?

    Heat alarms are designed to protect rooms like your kitchen, garage and loft areas based on the assumption that the build up of dust, moisture and fumes could cause issues such as false alarms.

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