Christmas Delivery Times

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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€12.95 Incl. 23% VAT

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Dual Safety Thermostat 18" is rated 4.1 out of 5 by 55.
Rated 1 out of 5 by from Poor This item has been redesigned but still bears the same part number and some problems of the old model, the body is not bigger but the Sensor tube is now offset more and fouling the heater terminal thus having to bend the terminal risking breaking it, also as with the previous models Max setting is just under 60 degrees c, anymore and and they keep tripping the overtemp stat and reducing the life, so only consider has a limited life product.
Date published: 2017-10-06
Rated 5 out of 5 by from Family DIY Fixer Replaced an old black and cream thermostat for the hot water cylinder and although this looked bigger it fitted in perfectly. Would have been a very easy job if I hadn't also decided to renew the old cable (with part no. 71940) to the immersion heater, which was showing its age. All works I'm off to my daughter's to look into her failed hot water system !!
Date published: 2017-08-20
Rated 5 out of 5 by from Just the job I had a faulty thermostat on an immersion tank. I was able to find the one I wanted very easily on the Screwfix website. I did a click and collect, all very easy. The thermostat is better than the original as is has a better feel for setting up and also has a thermal reset. Very happy with this purchase.
Date published: 2017-08-02
Rated 1 out of 5 by from Be careful Be careful when ordering this one, the head of the thermostat is larger than many out there. I bought one to replace a failed unit and it physically wouldn't fit in the immersion heater,despite the immersion heater being one I got from here a couple of years ago. It fouls on the neutral connection post. Can't comment on how well it works as never had it working, it will be going back.
Date published: 2017-04-08
Rated 2 out of 5 by from 18* thermostat BEWARE - Larger control box above illustrated picture shows normal size control box (black). actual new stock the control box (blue) is much larger so check out old stat size first. I had to bend existing element connections to enable new fit. the reset is as before a small button but the max temp rating is now 70deg.
Date published: 2017-01-10
Rated 5 out of 5 by from Good Thermostat Easy to install works straight out of the box, Well made Thermostat.
Date published: 2016-12-20
Rated 5 out of 5 by from Easy install This was very easy to install and gives out good hot water.
Date published: 2016-12-16
Rated 5 out of 5 by from Easy to fit Used it to replace non functioning unit. Easy to swap over
Date published: 2016-12-04
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