On 24 Mar, 22:44, John Rumm wrote:
None wrote:
hiya john... yeah, i see the screw and cover (with Therm on the top,
silly me) , but its tiny, and i dont know what will fit around it to
remove it...

I have just unscrewed it, but there is no immersion stat underneath,
so I dont know whats going on..

There is usually a little pointer type device there to set the temp. It
may be you have a fixed temp immersion, in which case one would expect
it to be high enough.

--
Cheers,

John.

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Well, it gets very hot indeed if left on for an hour or two, but we
havent used it very much at all in the last 4-5 months, relying on
central heating to heat the water. I put on the immersion for a couple
of hours today to see if it would help, and there is hardly any of
that organic material coming from the taps now... much better. I
wonder why this happens though?