CALL OUR TEAM NOW 0800 612 6537 Also FREE from UK mobiles

Mains Thermally Enhanced Optical Smoke Alarm (Thermoptek) with Sealed Longlife Back-up Battery - FireAngel Pro ST-230

Discontinued Product

This product has been discontinued.

alternative product

Mains Powered Optical Smoke Alarm with Back-up - Ei3016

  • Power: 230V mains powered with back-up battery
  • Backup Battery: Self-charging lifetime battery
  • Warranty: 5 year warranty
  • Mains powered optical smoke alarm
  • SmartLINK compatible when used with Ei3000MRF
  • Hardwire interlink with up to 12 compatible devices
  • Available in five variants
  • Kitemarked to BS EN 14604: 2005
  • Also suitable for both the Welsh and Scottish 2022 legislation

£53.99 inc VAT

£44.99 ex VAT

View Product
Product Overview

The FireAngel Pro ST-230 optical smoke alarm is mains powered that has a 10 year lifespan with a sealed lifetime lithium back-up battery. Designed to last the life of the alarm, the back-up battery continues to provide power in the event of a mains failure. The ST-230 smoke alarm can be interlinked (using cable) with up to 30 smoke and heat alarms from the FireAngel Pro series, providing wide coverage within a single smoke alarm system. Once interlinked, if the ST-230 smoke alarm is activated, it triggers all other linked alarms to also sound.

  • Power: 230V mains powered with a lifetime lithium back-up battery
  • Backup Battery: Built-in battery lasts the lifetime of your alarm
  • Warranty: 1 year warranty
  • CE marked and Kitemarked to BS EN 14604
  • Up to 30 FireAngel Pro alarms can be hard-wire interlinked within a single system
  • Suitable for installations complying to BS 5839-6: 2019 Grade D1
  • Thermally enhanced optical smoke sensor (Thermoptek technology)
  • Less prone to false alarms caused by cooking fumes
  • Test, hush and Sleep Easy™ function
  • Locate function: allows you to find the alarm that activated the system
  • Tamper-proof mounting plate locks the alarm head in place
  • Suitable for bedrooms, living rooms and downstairs hallways (not suitable for kitchens or garages)
  • Supplied with fixings; 2 x screws and 2 x rawl plugs
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

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 FAST230
Alternative Product Codes ST-230
Brand FireAngel
Back-Up Battery

Sealed lithium back-up battery

Dimensions (HxDia)


Operating Temperature

-10 °C to +45 °C

Sound Output


Weight 0.26kg
Product Datasheets
FAQs (1)
Q. What sort of smoke alarm system would I need to install for a HMO?

BS 5839-6 recommends that one or two storey HMOs with an individual floor area of no more than 200sqm (not the total of both floors) should have a Grade D smoke alarm system installed. Grade D refers to mains powered smoke alarms with a back up battery power supply. The alarms can be interlinked either by wire or by radio signal and the system does not require a separate fire alarm panel. For HMOs of 3 storey or higher, a Grade A panel system would need to be installed. This can cover the whole of the building, or can be used just for the communal areas with a separate Grade D system installed for the individual dwellings. For both applications, the level of cover should be a minimum of LD3 (in all escape routes) but this may change according to the fire risk assessment.

Key Product Features

Easy-to-use test/hush button takes centre stage

Break-out tab for seamless trunk wiring connection

3 coloured LEDs show you its status at a glance

Screws and rawl plugs for installation are included

What's Included?

Every FireAngel FAST230 is supplied with the following components.

  • 1 x FireAngel Pro ST-230 optical alarm
  • 1 x Lifetime lithium back-up battery
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Customer Reviews

7 customers have given this product an overall rating of 4.7 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: 4 / 5 Stars

Reviewed by:

More expensive than standard smoke detectors, but have good features Got three of these (two link together, wired). They were fitted by an electrician so I can't comment on that but it seemed easy enough. Note that the screws fitting the plate to the ceiling need to be recessed or they'll interfere with the working of the unit. These are neat and smart-looking. I wanted to fit these and not worry about them again (no replacing of batteries). I was a little disappointed that one of the units did develop a fault within a couple of weeks, but Safelincs were excellent and sent a replacement.

Published on: 28th April 2018

Rating: 4 / 5 Stars

Reviewed by:

Arrived rapidly, just what we wanted.

Published on: 14th November 2017

Rating: 5 / 5 Stars

Reviewed by:

Easy to fit to replace existing hard wired alarms.

Published on: 12th August 2017

Show More

Looking for more information?

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

Live Chat Available Now
Direct Telephone 01507 464181


Colour Scheme


Pricing Display



By continuing to browse this site you agree to the use of cookies.