Immersion overheat stat

Dec 12, 2022 Last reply: 3 years ago 5 Replies

Well I thought I was sorted when I discovered that the overheat stat had tripped yesterday and it was all working when I finished testing it all but once again the water failed to heat properly last night and when I checked the stat the button *hadn’t* popped out this time but it’s testing as open circuit.



We live in a very soft water area and I doubt that the element really is overheating so if possible, I’d like to try just replacing the over-heat stat first.



It looks a bit like this

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but mine seems to have a threaded base and screws into the metal of the immersion heater boss.



Can’t seem to locate them on line. Are these available as replacement components or should I just bite the bullet and get a whole new heater?



Tim


We kept having problems with our immersion - either tripping the overtemperature stat or tripping the RCD. We too are in a soft-water area and the casing of the immersion heater element had been eaten through (hence the RCD trips) and had presumably curved before it holed, putting the element up against the stat.

Am 12.12.2022 um 10:28 schrieb Tim+:

This one seems threaded:

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120c though! Too high for a domestic cylinder.

I did find one after much searching.

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The old one has clearly overheated internally from electrical causes so I’m happy that it’s nothing to do with the element or cyclinder stat.

Tim

Buy a Tesla immersion heater to go with your new car :-)

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Yes this even happens in hard water areas. I remember that the last time it was replaced the plumber showed me the state of what originally was basically a zig zagged element, but it was now twisted out of shape, with crusty nodules all over it and the seamed tube it was in was clearly wide open in some places. You would not have got the thermostat probe to miss the distorted shape when inserted. Brian

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