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Radio-Interlinked Thermally Enhanced Optical Smoke Alarm - FireAngel WST637

In Stock
54.99 ex VAT
65.99 inc VAT
Product Overview

The FireAngel WST637 contains an optical smoke alarm with built-in radio-frequency technology, allowing up to 50 alarms to be wirelessly interlinked and form a system. With thermally enhanced optical smoke sensing technology, the WST637 provides quick detection to slow smouldering fires, and has the added benefit of a sealed 10 year lithium battery, designed to last the life of the alarm.

  • Battery powered smoke alarm - 10 year sealed lithium battery
  • CE marked and LPCB tested to BS EN 14604
  • Test and hush button feature
  • Can be wirelessly connected with up to 50 radio-interlinked alarms
  • An interlinked system provides the earliest possible warning of fire
  • Radio-frequency range: 200m in free space, up to 35m in buildings
  • Fitted with a thermally enhanced optical smoke sensor
  • Quicker at detecting smouldering fires (compared to standard optical sensors)
  • Ideal for areas adjacent to the kitchen (not suitable for kitchen or garage)
  • Locate function allows you to find the alarm that activated the system
  • 7 years warranty - EXCLUSIVE to Safelincs
  • Suitable for installations complying to BS 5839-6: 2013 Grade F
  • Available with FREE pre-connection service
  • Supplied with fixings; 2 x screws and 2 x rawl plugs
  • Free Shipping
Whats Included

The FireAngel WST637 Optical Smoke Alarm Kits are supplied as standard with some exclusive extras that make purchasing these alarms easier and more cost-effective, including:

  • 7 year warranty - EXCLUSIVE to Safelincs
  • FREE delivery on your order
  • FREE after the fire replacement guarantee
  • Available with FREE pre-connection service
  • WST-630 Optical Smoke Alarm with self-adhesive mounting pad

The table below shows all the units that can interconnect with the FireAngel radio-interlinked series.

Alarms from the Same Series

Model Number
Type of unit
Type of interconnection
WST637 Optical Smoke Alarm Radio-interlinked
WHT637 Heat Alarm Radio-interlinked

Compatible Alarms

Model Number Type of unit Type of interconnection
WST-230 Mains Powered Optical Smoke Alarm Radio-interlinked
WHT-230 Mains Powered Heat Alarm Radio-interlinked

Carbon Monoxide Alarms

Model Number
Type of unit
Type of interconnection
W7-CO-10X Carbon Monoxide Alarm Radio-interlinked

Ancillary Products

Model Number
Type of unit
Type of interconnection
W2-SVP-630 Wireless Strobe and Vibrating Pad Radio-interlinked
W2-LFS-630 Wireless Low Frequency Sounder Radio-interlinked
Technical Data

This is the technical data for the Radio-Interlinked Thermally Enhanced Optical Smoke Alarm - FireAngel WST637.

Product Code FAWST637
Weight 0.26kg
Dimensions (HxDia) 41x132mm
Battery Type 10 year sealed lithium battery
Sound Output 85dB at 3 metres
Radio-Frequency Range Free Space: Up to 200m
In Buildings: Up to 35m
Operating Temperature +4 :C to +38 C
Relative Humidity (non-condensing) Up to 90%
FAQs (15)

Q. Do I need an ionisation or optical smoke alarm?

A. We recommend using an optical smoke alarm in hallways, as these are less likely to go off because of cooking fumes from a connected kitchen. Optical smoke alarms are also ideal for living rooms, dining rooms, bedrooms, as they are good at detecting smouldering fires from soft furnishings. For landings we recommend ionisation alarms. Heat alarms are designed for kitchens and garages. No alarms should be installed in bathrooms.

Q. Can I put my smoke alarm on the wall, or must it be mounted on the ceiling?

A. The best location to install your smoke alarm is in the centre of the ceiling rather than on the wall. During a fire, smoke initially rises and then spreads to the sides of the room. By installing the alarm on the ceiling, this ensures that you receive the earliest possible warning of a fire.

Q. How long do smoke alarms last before needing replacement?

A. It is recommended that smoke alarms are replaced after 10 years. This is because the sensors in the smoke alarms become less sensitive and may not activate when a fire is present.

Q. Can a smoke alarm be fitted with a sticky adhesive pad in a let property?

A. The sticky pad is suitable for all battery operated smoke alarms. However, we cannot judge if battery alarms are suitable for your let property, as let properties usually require mains powered alarms. There is some advice to this in the governments guides to fire risk assessments.
Also see the LACoRS guide for let properties.

Q. How do I safely dispose of my old smoke alarms?

A. Safelincs is signed up to Valpak's WEEE (Waste Electrical and Electronic Equipment) Distributor Take-Back Scheme (Registration ID: 7370). Private households can therefore drop off their electronic and electrical fire safety waste at their municipal recycling centre when they are purchasing new products from us. To find your nearest recycling centre, please visit

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Key Product Features

Easy-to-use test and hush button in the centre

Powered by a sealed 10-year long life battery

Status indicator lights around the main button

Includes screws and rawl plugs for installation

Product Dimensions

What's In The Box?

  • 1 x FireAngel WST-630 optical alarm
  • 1 x Sealed 10-year lithium battery
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Data Sheets

Pricing & Availability

Model Stock Levels Price Weight
Product Code: FAWST637 Stock Level:
In Stock

54.99 ex VAT

65.99 inc VAT


Customer Reviews

15 customers have rated this product and it has an overall rating of 4.7 out of 5

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

4 / 5 Stars

Reviewed by: KW

Easy enough to fit and program, signal penetraes several floors of house and ensure I can hear it going off in the loft.

Published on: 23rd January 2017

5 / 5 Stars

Reviewed by: PM

Excellent - just works

Published on: 13th January 2017

5 / 5 Stars

Reviewed by: RD

Great alarm easy to set up (especially when safelincs link then for you!). Have this in hall close to kitchen and upstairs, not affected by kitchen activity however the upstairs unit is triggered by steam from the bathroom but this is to be expected (especially as our bathroom ends up like a stream room). Very good alarm for price

Published on: 24th November 2016

4 / 5 Stars

Reviewed by: DB

Really pleased with this product. Not so pleased to see it a lot cheaper in Homebase, but can at least get an extra one to link in with the two I purchased from you.

Published on: 4th November 2016

5 / 5 Stars

Reviewed by: TE

as above

Published on: 12th June 2016

4 / 5 Stars

Reviewed by: BM

Very pleased with this product.easy to fit.

Published on: 1st May 2016

5 / 5 Stars

Reviewed by: JB

Fumes kill you before the heat. Brilliant product, and the WiFi interlinkage sets off all devices if just one is triggered giving mote time to escape danger. I feel much safer in our home now.

Published on: 18th April 2016

5 / 5 Stars

Reviewed by: MM

Great product. Great product. The fact they are interlinked and give a ten year use with sealed batteries means they comply to self-catering accomodation rules

Published on: 18th April 2016

4 / 5 Stars

Reviewed by: SP


Published on: 27th March 2016

5 / 5 Stars

Reviewed by: GM

brilliant thatched house got one in loft talking to others Needed interconnected alarms for thatched house insurance. Insurance surveyor impressed asked me where I got it from. No wires or batteries required programming took 5 mins just press the buttons and they find each other. Would definitely recommend

Published on: 13th March 2016

5 / 5 Stars

Reviewed by: IH

Nice unit that's easy to install

Published on: 16th February 2016

4 / 5 Stars

Reviewed by: -

easy to set up

Published on: 27th January 2016

5 / 5 Stars

Reviewed by: -

Brilliant Product & very easy to fit.

Published on: 21st January 2016

5 / 5 Stars

Reviewed by: -

The units were very easy to install and easily linked.

Published on: 24th November 2015

5 / 5 Stars

Reviewed by: -

Pre-synchronised takes the pain away Free synchronisation between two alarms meant this product was fit for purpose out the box. We know it works well both pressing the "test" button and by burning toast! Making a decision about adopting this model took a while (plenty of options) but this ticks all our boxes..

Published on: 12th November 2015

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Delivery Options

The following delivery options are available on this product.

FREE Next Day Delivery

Delivered the next working day by UK Mail FREE of charge - More info

For delivery on order within

Excellent Warranty

This product is supplied with a 7 year manufacturers warranty as standard

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Looking for more information?

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

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