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Replacement for DETA 1155 Mains Powered Heat Alarm

Discontinued Product - No Compatible Replacement

Please Note: The manufacturer has withdrawn from the European market and there is no compatible alternative that will fit onto your existing.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

alternative product

Kidde Firex Mains Powered Alarms with Alkaline Battery

  • 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

£21.00 inc VAT

£17.50 ex VAT

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Product Overview

The DETA 1155 mains powered heat alarm with akaline back-up battery has now been discontinued by the manufacturer. To enable DETA 1100 series alarm owners to continue to update their systems, BRK have developed their range of alarms to be entirely compatible with your existing DETA alarm bases. This means that you don't need an electrician to install your replacement alarm.

The recommended replacement for the DETA 1155 heat alarm is the BRK 690MBX. This is also a mains powered heat alarm with replaceable alkaline battery back-up. Heat alarms are designed for locations where smoke alarms may be falsely triggered by everyday household fumes such as kitchens and garages. The replacement alarm features a test & hush button for easy testing and maintenance.

  • Power: 230V mains powered with back-up battery
  • Back-up Battery: 9V alkaline back-up battery (included)
  • Warranty: 5 year manufacturer's warranty
  • Fits onto your existing DETA alarm push-fit base
    • BRK twist-fit base included to keep as a spare
  • Suitable for kitchens, garages and home workshops
  • Thermistor heat sensor provides resilience against false alarms from normal fumes
  • CE and Kitemarked to BS 5446-2: 2003
  • Performs a self-check every 48 seconds to ensure the alarm is functioning correctly
  • Test and silence button feature
  • Replacements are also available for the DETA 1151 and 1153 mains powered smoke alarms
  • Other DETA / BRK replacement kits are available to cover the full DETA 1110 and 1150 series
  • Product warranty and life commences from date of purchase

The simple installation process of the 690MBX replacement alarm negates the need for an electrician, though you must ensure that mains power to all interlinked alarms is cut before beginning work. The interlink wire can carry a live electric current between alarms if they are powered from different circuits.

Compatible Alarms

Below is a table of all alarms which can be interchanged using the same base plate and interlink system. Care should be taken to ensure the correct model is purchased to replace existing alarms. Optical smoke alarms can be used in place of ionisation smoke alarms, but heat alarms and smoke alarms serve different purposes and cannot be swapped.

Original Model Type of Alarm Replacement Model
DETA 1111 Ionisation Smoke Alarm with Alkaline Battery and Twist Base DT11RA
DETA 1113 Optical Smoke Alarm with Alkaline Battery and Twist Base Discontinued
DETA 1115 Heat Alarm with Alkaline Battery and Twist Base Discontinued
DETA 1151 Ionisation Smoke Alarm with Alkaline Battery and Push Base DT51RA
DETA 1153 Optical Smoke Alarm with Alkaline Battery and Push Base Discontinued
DETA 1155 Heat Alarm with Alkaline Battery and Push Base Discontinued
Technical Data
Product Code DT55RA
Alternative Product Codes 1155, DETA1155, BRK690MBX, BRKEHA
Brand DETA
Back-Up Battery

Replaceable 9V Alkaline

Dimensions (HxDia)

58 x 140mm (including base)

Operating Humidity

10% to 85%

Operating Temperature

+5 °C to +38 °C

Sound Output


Weight 0.31kg
Product Datasheets

Key Product Features

What's Included?

Every DETA DT55RA is supplied with the following components.

  • 1 x BRK 690MBX heat alarm
  • 1 x 9V replaceable alkaline battery
  • 1 x Spare twist-fit base
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Excellent Warranty

This product is supplied with a 5 year manufacturers warranty as standard

Customer Reviews

2 customers have given this product an overall rating of 5 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5 Stars

Reviewed by: S N

Sent on time. Very easy to fit on existing mounting. Working very well up to now.

Published on: 29th January 2021

Rating: 5 / 5 Stars

Reviewed by: J G

Easy to install Value for money

Published on: 3rd August 2020

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 464181


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