FireAngel ST-621R Thermoptek Smoke Alarm Product Code: 4512D

Reacts quickly to all types of fire and is less prone to nuisance alarms from cooking fumes. Compact shape and design is ideal for living areas such as the lounge or bedroom. AA batteries will require changing every 12 months.


  • 85 Alarm
  • Battery-Powered
  • Loud 85db Alarm
  • Large Button for Easy Testing & Silencing
  • Approx. 1 Year Battery Life


EN 14604: 2005.
Additional Information
Technical Specification
  • Power Source : Battery-Powered
  • Brand : FireAngel
  • Product Type : Thermoptek Smoke Alarm
  • Alarm Product Type : Smoke
  • Model Name : Thermoptek
  • Fixings Supplied : Fixings Supplied
  • Total Product Weight : 0.250 kg
  • Model No : ST-621R
  • Battery Duration : Replacement Battery (Alkaline)
  • Wireless/Wired : Wireless
  • Alarm Sensor Type : Optical
  • Battery Type : AA
  • Colour : White
  • Product Depth : 34 mm
  • Pack Size : 1
  • Product Diameter : 107 mm
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€13.45 Incl. 20% VAT

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FireAngel ST-621R Thermoptek Smoke Alarm is rated 4.8 out of 5 by 21.
Rated 5 out of 5 by from good for the price good for the price easy installation interchangeable batteries recomaned
Date published: 2017-08-10
Rated 5 out of 5 by from Simple attractive product I done my homework and read various reviews on different websites and this detector came out on top for features and value. Very easy to understand and install. Nice big reset button if ever required.
Date published: 2017-06-30
Rated 4 out of 5 by from Satisfactory Fair price for a product which performs as expected. Build quality OK.
Date published: 2017-06-06
Rated 5 out of 5 by from Ideal Smoke Alarm Bought the twin pack to replace an older smoke alarm. The product looked great out of the box and both tested working. As a DIYer I was very pleased with the relative easy installation. A simple two screw fitting of the base plate then a twist assembly to install the alarm. It is a must for even the non DIY person.
Date published: 2017-04-20
Rated 4 out of 5 by from Neat and well-made smoke alarm A well-made product which proved easy to install, and seeming to be ready for use immediately the batteries were installed. At the price it was good to see that top-quality Duracell batteries were included. Performance and reliability are aspects which are difficult to assess immediately after installation, but the quality of instruction gives confidence.
Date published: 2017-04-11
Rated 5 out of 5 by from Compact smoke alarm I bought 2, easy to install, very compact and neat looking. Preferred to have separate batteries after reading reviews of smoke alarms with sealed batteries. Really happy with my purchase.
Date published: 2017-03-03
Rated 5 out of 5 by from Good simple smoke alarm Bought 2 of these, easy to set up an install all fixing supplied, looks good, nice and loud, comes with batteries (takes 2 AA)
Date published: 2016-09-22
Rated 5 out of 5 by from Guardian Angel Bought two of these to replace other models that had irreplaceable batteries. These were easy to fit and I like the fact that they use AA batteries which are cheap and readily available. I would have liked the ability to silence the low battery signal but you can't expect every feature in such a reasonably priced detector.
Date published: 2016-08-18
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