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Tesla Thermostat 18"

4.3 (108 reviews)
SKU: 260223155525826 EAN: 5060232140702

Compare 1 price for Tesla Thermostat 18" — from £15.39 across 1 UK seller including Toolstation.

£15.39 6h ago
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Customer Reviews 108

4.3
108 reviews
5 star
72
4 star
13
3 star
13
2 star
4
1 star
6
18” thermostat for immersion heater water tank
5.0
February 19, 2026
11rob2 Verified Purchase

18” thermostat works well in my mothers immersion heater, works how it supposed to, used to replace faulty old one

Direct replacement for identical thermostat
4.0
December 28, 2025
Richard 51 Verified Purchase

Direct replacement for identical thermostat that had failed

Immersion Thermostat
5.0
December 20, 2025
MyName54321 Verified Purchase

Was identical to the old one. Replacement was as easy as removal. Set to 70.

Hampshire resident
4.0
October 3, 2025
259f4e26-5ef2-5713-a1a0-618885030f5a Verified Purchase

Available as indicated on website and appears to have rectified temperature of immersion heated water

Working fine
4.0
June 14, 2025
CassieL Verified Purchase

Thermostat easy to instal and working fine. I was a little worried to be handed the item with no packaging whatsoever, not even a bag or label. I was assured, if we needed to take it back 9prior to installation), it would be accepted

Thermostat
5.0
June 10, 2025
Big C2018 Verified Purchase

Easy to install thermostat, good quality reasonably priced

Very Slightly Larger
3.0
May 31, 2025
Aunty Granty Verified Purchase

This unit was very slightly larger than the original one. Whilst the change seemed to be insignificant did not initially fit into the Immersion Heater.

The old unit slid straight out as I expected as this was not the first one I have replaced. With this one I had to bend one of the terminal s to get it into the pocket. No big deal but disappointing that a simple straight forward swap risked causing damage to a an otherwise perfectly good heater.

At the end of it, I have a working immersion heater but I do have some frustration that a careless design change complicated an otherwise very simple fix.

18in Immersion Thermostat
5.0
April 17, 2025
Dunnow Verified Purchase

Great quality Immersion Thermostat 18in long. Dead easy to fit and wire up, only
two leads (+ positive brown lead to thermostat) works really well.

So far reliable
5.0
April 15, 2025
Realjohn Verified Purchase

Working without any problems after 3 weeks. Easy to fit in 10 minutes.

In stock and immediately available for collection
5.0
April 13, 2025
Electric Brian Verified Purchase

In stock and immediately available for collection.

Spot on
5.0
April 8, 2025
b481a7d0-d0f2-5082-ba89-3e888ac3addd Verified Purchase

Does exactly what it’s supposed to do at a competitive price

Europe 🙄
2.0
February 27, 2025
The Black Rabbit Verified Purchase

The pop out "safety" thermostat kept popping out , involving a trip to the loft with a pin, to manually reset it. Researching on the net - the EU have mandated water should be no hotter than 60c . Tesla seem to have taken this as :- all thermostats must trip at 60c.
This was occurring in the depths of winter <60c, in summer my solar can take the temperature well over 80c. These pop outs should not operate until >90c. Yes i uncovered the cap of the immersion heater.
I've now disabled the pop out and cranked the Max 60c to go max 70c. Thoroughly voiding the guarantee.
Finally getting proper hot water like what we used to get before over regulation.

Good service as I normal
5.0
February 10, 2025
CGibb Verified Purchase

Easy to buy and easy to fit at a competitive price

Non-Starter
1.0
December 30, 2024
Saus Verified Purchase

Failed to work from the outset.

Thermostat tested and found to be 'open circuit at room temperature.

Returned and exchanged.

The replacement is working - so fingers crossed that this one stays that way.

So, perhaps take a resistance meter with you to check the thermostat when buying one ?

18 inch immersion heater stat
1.0
December 27, 2024
ncv electrical erdington Verified Purchase

it did not work properly the over heat thermostat to weak

Check it really does fit!
2.0
December 9, 2024
Hunt994 Verified Purchase

Selected this because it apparently was a direct replacement, but it doesn’t fit! The housing is slight larger and so fouls against the live element connector..

Good value for money Thermostat replacement for an immersion heater
4.0
December 1, 2024
MAC007 Verified Purchase

Was a direct replacement for failed thermostat. No issues fitting it. Powered up the immersion heater, check for power etc. All good and we now have hot water. How long this unit last...time will tell

Too big !
2.0
November 20, 2024
PeterUpALadder Verified Purchase

I am sure it works but the terminal block is larger than the existing one i had so it didnt fit !

Thermostat
3.0
October 31, 2024
Tony 007 Verified Purchase

The first one stopped working, had to get a replacement

Just the Job
5.0
October 27, 2024
Rob of Hereford Verified Purchase

Replacement thermostat for Hot Water tank. Working fine and completes the job in hand.

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