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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.


  • 85dBA 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 service up to 3 working days: €8.95

Free delivery on all orders over €70.00

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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. 23% VAT

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FireAngel ST-621R Thermoptek Smoke Alarm is rated 4.8 out of 5 by 26.
Rated 5 out of 5 by from Smoke Detectors Brought 3 to replace other fireangle detectors that you can't change the batteries. They should last 10 years I got 4, anyway easy to install and come with Duracell AA batteries that can be replaced. Look neat on the ceiling and very loud when tested. Hoping they will be never needed but piece of mind at a good price.
Date published: 2019-03-21
Rated 5 out of 5 by from Replacement Smoke detectors After one or two recent alarm faults on my existing four detectors I realised that all the units had gone past their expected life span. No excuse but they were four years over. Bought four of these new units and fitted them in about one hour. The bonus was that they were on offer and that they came with new Duracell batteries. Very easy to fit, look good and very pleased with my purchase.
Date published: 2017-10-07
Rated 5 out of 5 by from Ideal smoke detector I purchased this optical detector as I wanted to install it very near to the kitchen. The instruction leaflet is excellent and installation was simple with the separate baseplate, which is affixed to the ceiling or wall with 2 screws (provided). The smoke alarm attached to the baseplate by simply turning the alarm a few degrees, very neat. The self-test and false alarm cancel button is nice and large. The product's appearance is great. I gave a middling score for reliability only because I have not owned it long enough to give a top score for this aspect.
Date published: 2017-08-20
Rated 4 out of 5 by from Mine lives in the garage I purchased this battery smoke alarm to go in the garage at the bottom of the house. The old fridge & tumble dryer live in the garage so I thought a smoke alarm might be a good precaution in case these old electrical items catch fire.
Date published: 2017-08-20
Rated 5 out of 5 by from Have 5 and all working fine I have five of these around the house and they look great and work fine.
Date published: 2017-08-20
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
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