Dual Safety Thermostat 18" Product Code: 89445

Dual safety system prevents overheating problems.


Temperature range: 20-70°C. Not for use with Ariston immersion heaters.
Additional Information
Technical Specification
  • Brand : Unbranded
  • Product Length : 18 "
  • Product Type : Dual Safety Thermostat
  • Total Product Weight : 0.07 kg
  • Temperature Range : 20-70 °C
  • Pack Size : 1
  • 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.


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€13.95 Incl. 23% VAT

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Dual Safety Thermostat 18" is rated 4.1 out of 5 by 72.
Rated 5 out of 5 by from Perfect job Had problems with super heated water, so: 1) Went to Screwfix and bought thermostat (good price!) 2) Went to airing cupboard 3) Removed top cover (1 screw) 4) Unscrewed two wires and slid out old thermostat 5) Slid in new thermostat and reassembled Job done!! 45 mins to drive to/from Screwfix 10 mins to replace Nice relaxing day and earnt Brownie Points telling wife spent all day fixing hot water...
Date published: 2019-04-26
Rated 3 out of 5 by from Bigger job than expected Bought this as a direct replacement for the thermostat in a Tesla titanium immersion, unfortunately, it is slightly bigger than the old model with same part number. The problem was the connection on the heater post stopping the thermostat entering home. With some carefull modification to the connection with a small grinder I was able to take enough material away, keeping the connection serviceable, and at the same time not putting too much stress on the element and its insulation. A 10 minute job turned into a marathon but once inserted took minutes to connect up. Now working as expected.
Date published: 2019-04-17
Rated 5 out of 5 by from Good replacement Product was in stock and available when I needed it. The head was slightly bigger than the Backer thermostat I was replacing, but it squeezed in. Working ok at the moment, and the water temp seems to match the setting. Time will tell on the reliability.
Date published: 2019-03-23
Rated 3 out of 5 by from Excellent- if it works! First one I bought was faulty. Should have guessed something was wrong when I heard two screws flapping around in the box. Tested it with a meter once home and confirmed it was faulty. No hassle when I took it back to shop. Excellent service from staff. But not what I wanted to be doing on a Sunday afternoon.
Date published: 2019-03-12
Rated 3 out of 5 by from As catalogue Purchased to replace broken item. Slightly larger head than previous however different manufacturer as Screwfix no longer stock the old model. Easy to install and connect. Easy to adjust and reset.
Date published: 2019-03-03
Rated 4 out of 5 by from Replacement heater element First class replacement slightly larger than existing but easily rectified
Date published: 2019-01-14
Rated 3 out of 5 by from Good if temp adjustment works Bought a couple of these over 10 years. Temp adjustment didn't work so always very hot. Replaced it for one that does and now safer
Date published: 2018-12-06
Rated 4 out of 5 by from Great value for money First class product, having had issues for a while , I replaced and updated to this product, highly recommend and good value, no issues fitting.
Date published: 2018-12-06
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