FireAngel ST-621R Thermoptek Smoke Alarm

Product Code: 4512D
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.

Was €13.45

Special Price €10.95

Incl. 20% VAT

Save €2.50 (18%)

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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.


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FireAngel ST-621R Thermoptek Smoke Alarm is rated 4.8 out of 5 by 17.
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
Rated 5 out of 5 by from Neat looking alarm Looks nice, easy to use twist on / off plate for securing to ceiling. Comes with screws / plugs and 2x AA. Lovely!
Date published: 2016-06-09
Rated 5 out of 5 by from A good little unit Great little alarm as others have said. The usual indestructible packaging though! TIP: The cover won't go on unless the batteries are fitted, found this out the hard way (doh!)
Date published: 2016-03-11
Rated 5 out of 5 by from good value smoke alarm what more can you ask for runs on AA batteries which were included not cheap batteries either but Duracels ear spliting loud when testing smart looking for a smoke alarm and good value for money. Brought 2 to replace old alarms 1 for utility room where tumble dryer is now seems a must with them
Date published: 2016-03-01
Rated 5 out of 5 by from Great value Great performance Fantastic smoke alarm and very easy to install. This alarm uses AA batteries which makes it so convenient. Screwfix as usual was as good as ever bought online ready to collect in minutes great service great item.
Date published: 2016-01-27
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