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Mains Powered Smoke Alarms & Heat Alarms with Sealed Longlife Back-up Battery - FireAngel Pro 230 Series

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Mains Smoke Alarms

Mains powered smoke detectors and heat alarms certified to BS 5839 Part 6 Grades D, D1, & D2 for new domestic buildings and extensions.

Product Overview

Mains powered with a lifetime back-up battery, the FireAngel Pro series of alarms are available in two versions: with optical smoke or heat sensor. Up to 30 FireAngel Pro alarms can be hard wire interlinked within a single system, enabling all alarms to sound if any one of them detects a fire. The sealed lithium back-up battery is designed to last the full 10 year life of the alarm and continues to provide power in the event of a mains failure.

  • 230V mains powered with sealed lifetime lithium battery – never needs replacing!
  • Frustration-free! No need to replace the back-up battery for the life of the alarms
  • Kitemarked to BS EN 14604 (optical smoke) and BS EN 5446-2 (heat)
  • Suitable for installations complying to BS 5839-6: 2019 Grade D1
  • Available in two versions:
    • Optical smoke alarm (ST-230) responds quickly to smouldering fires - used in bedrooms, living rooms and hallways
    • Heat alarm (HT-230) responds to rate of increase in temperature - used in kitchens and garages
  • Warranty: 1 year warranty
  • Test, hush and "Sleep-Easy" function
  • Locate function: allows you to find the alarm that activated the system
  • Up to 30 alarms can be hard-wire interlinked within a single system
  • Tamper-proof mounting plate locks the alarm head in place
  • Please note: Alarms sold separately
  • This alarm is also suitable for the updated 2022 Scottish legislation for fire alarms in homes

In a wireless-only system the maximum number of compatible units that can interlink is 50, while a hard-wired-only system is limited to 30 units. In a mixed hard-wired and wireless alarm system these maximum quantities can be exceeded.

For each "group" of hard-wired alarms in a system, only one should be a wireless model. For example, in a 3 storey house you could hard-wire 2x ST-230 and 1x WST-230 alarms together on each floor with all of the WST-230 models wirelessly interlinked to each other. This can technically be done to a maximum of 50 groups of 30 alarms, though FireAngel has not designed, optimised, or tested these alarms for such a large system. Having so many alarms interlinked would create large communication delays between the alarms, potentially resulting in occupants not being given adequate warning of a fire. It is heavily recommended that customers desiring a large amount of alarms for a single property instead look into full Fire Alarm Systems which are designed for larger premises.

The table below shows all the units that can interlink with the FireAngel Pro alarms.

Alarms from the Same Series

Model Number Type of unit Type of interlink
WST-230 Mains Powered Optical Smoke Alarm Hard-wire interlink
WHT-230 Mains Powered Heat Alarm Hard-wire interlink
ST-230 Mains Powered Optical Smoke Alarm Hard-wire interlink
HT-230 Mains Powered Heat Alarm Hard-wire interlink
Technical Data
Product Code

ST-230 Optical Smoke Alarm:  FAST230

HT-230 Heat Alarm:  FAHT230

Brand FireAngel
Back-Up Battery

Lifetime Lithium Battery

Dimensions (HxDia)

ST-230 Thermoptek Smoke Alarm: 52x141mm

HT-230 Heat Alarm: 52x141mm

Operating Temperature

-10 °C to +45 °C

Sound Output



FAST230: 0.26kg

FAHT230: 0.23kg

Product Datasheets

Customer Reviews

12 customers have given this product an overall rating of 4.9 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: J K

Great product, easy to install and looks great. No incidents so far, but the power indicator and test function, gives you that added sense of security. Great service and delivery was on time as expected.

Published on: 19th September 2020

Rating: 5 / 5 Stars

Reviewed by:

Very good

Published on: 11th May 2018

Rating: 5 / 5 Stars

Reviewed by:

small and neat

Published on: 18th April 2018

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