Dual Safety Thermostat 7" Product Code: 21275

Dual safety system prevents overheating problems.


Temperature range: 10-70°C. Not for use with Ariston immersion heaters.
Additional Information
Technical Specification
  • Brand : Unbranded
  • Product Length : 7 "
  • Product Type : Dual Safety Thermostat
  • Total Product Weight : 0.04 kg
  • Temperature Range : 10-70 °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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€13.45 Incl. 23% VAT

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Dual Safety Thermostat 7" is rated 3.6 out of 5 by 16.
Rated 1 out of 5 by from Dangerous, fire risk, avoid! Bought and fitted one of these a year ago to replace one that lasted 20 years. Also got a spare, which was different, so this is a generic product by different manufacturers. Mine was blue and white with manufacturing code F-65/S-90 and date 07/2016. It has just failed very dangerously. The water was boiling and the room was filled with smoke. After turning off, leaving to cool and removing to examine, the theromstat contact has arced, burning and melting the case (hence the smoke) and insulation of connected wires (which were still securely attached so not the issue), failing in the ON position. The damage is so severe it has prevented the safety cutout operating (hence the boiling water). I will show this to Screwfix then report to Trading Standards. If this review is not published to warn others, I will advise Trading Standards of this and ask that they approach Screwfix for a recall.
Date published: 2018-05-07
Rated 1 out of 5 by from too large for a fortic f3 too large for a fortic f3 standard immersion element. no choice but to drain down and replace the whole fitting, BOTH! to be sure.
Date published: 2018-05-03
Rated 5 out of 5 by from Up To Temperature In 60 Mins! Operating Holiday Rental properties throughout Wensleydale the need for a working immersion heater thermostat over the Bank Holiday weekend was critical to satisfy our guests needs for consistent hot water .. The online ordering process to collection was seamless and took less than 60 minutes to procure & fit it - Thank you for being there!
Date published: 2018-04-04
Rated 4 out of 5 by from Compare size of head with old The old thermostat I was replacing had a much smaller head than this one. So had a problem getting passed the immersion connections. To early to comment on reliability.
Date published: 2017-12-31
Rated 5 out of 5 by from plumber 1 great little replacement part comes well packaged as not to be broke in transport and fit straight in no problems nice hot water happy customers
Date published: 2017-01-04
Rated 4 out of 5 by from size of head !!! Water hardness irrelevant for this item, as NOT in contact with water. This cutout is slightly larger than old style ones, and you may find it fouls the heater terminal. If it does, you have problems.
Date published: 2016-12-23
Rated 4 out of 5 by from E7 Element stat Does the job and i always carry this one as a spare .
Date published: 2016-09-05
Rated 1 out of 5 by from Not great Thermostat keeps cutting out and needing resetting, looks like the thermostat is not working and the overheat protection is cutting in as water is very hot, even if the thermostat is turned right down to lowest setting. Have bought another one elsewhere and fitted it yesterday and all seems fine with that one so must have been unlucky and got a faulty one from screwfix.
Date published: 2016-08-22
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