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Mains Powered Heat Alarm with Alkaline Back-up Battery - BRK 790MBX

Discontinued Product - No Compatible Replacement

Please Note: BRK have withdrawn from the European market and there is no compatible alternative that will fit into your existing system. Since it is not possible to interlink alarms from different manufacturers, new alarms will be needed throughout. The recommended replacement for the whole discontinued BRK 700MBX range is the Kidde Firex series. This will require an electrician to replace your old BRK bases with new Kidde bases.

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Smoke, Heat and CO Alarms

Buy smoke, heat & CO alarms at budget prices. Our range alarms are excellent value for money and are certified to British Standards and CE Marked.

Product Overview

The BRK 790MBX (also known as 690MBX) is a mains powered heat alarm designed for installation in areas where a standard smoke alarm would not be suitable, such as kitchens and garages. The alarm is designed to detect rapid increases in room temperature and up to 12 smoke and heat alarms can be interlinked via a hardwired connection to ensure an early warning if a fire is detected. Supplied with an easy to install push-fit base and a replaceable alkaline back-up battery.

  • Free next day delivery, dispatched same day if ordered before 3.00pm
  • 230V mains powered heat alarm
  • 9V alkaline back-up battery (included)
  • Hardwire interlink with up to 12 compatible devices
  • Monitors rate of increase in room temperature
  • Suitable for installations needing to comply with BS 5839-6: 2013 Grade D, E and F
  • Ideal for kitchens and garages
  • 5 year manufacturer's warranty
  • Test button facility
  • CE marked and Kitemarked to BS 5446-2
  • Dimensions (HxDia): 68x140mm

The table below shows all the units that can interlink with the BRK mains powered smoke and heat alarms.

600 Series

Model Number Type of unit Type of interlink
660MBX Ionisation Smoke Alarm Hard wire interlink
670MBX Optical Smoke Alarm Hard wire interlink
690MBX Heat Alarm Hard wire interlink

700 Series

Model Number Type of unit Type of interlink
760MBX Ionisation Smoke Alarm Hard wire interlink
770MBX Optical Smoke Alarm Hard wire interlink
790MBX Heat Alarm Hard wire interlink
Technical Data
Product Code BK790MBX
Brand BRK
Dimensions (HxWxDia)


Power Type

Mains powered with 9V alkaline back-up battery

Sound Output

85dB at 3m

Temperature Range

+5 °C to +38 °C

Weight 0.33kg
Product Datasheets

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464155


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