Little Clanger

Thank you both. Very useful

I seem to remember that the relationships between resistance, voltage, power and current are covered by the Ohms Law formulae, but what is the formula for calculating power required to heat a given volume of water through a given temperature change? Thanks

Again, thanks for the calculations, John

OK, thanks

So immersion can be on for even shorter length of time?

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In answer to both these points, yes, I'm resigned to draining the tank and taking the element out

Thanks for the calculations. That's interesting. I usually leave the immersion on for the full Economy 7 overnight 7 hours, on the principle that as it is thermostatically controlled, it will switch itself off when the set temperature is reached. Now, I will reset the timer to the minimum time required and see if that makes any difference.

Voila encore

Initially, I'm renewing the thermostat in the lower immersion heater, with a different make (a Backer to replace a Tesla). A continuity test on the element gave me 21 ohms, which I understand is about right. Confusingly, it was working fine last night - heated a whole 162 litre cylinder without tripping. By the way, a note to NickfromWales - I haven't been able to follow your advice about returning the cylinder because I bought the cylinder without any immersion heaters fitted. I bought the immersion heaters from Screwfix, but didn't keep the receipt, so can't return them.

I've moved the thermostat from the bottom immersion into the upper immersion, and put it on 'Boost'. It hasn't tripped yet, but the upper immersion doesn't stay on for as long as the lower one, of course, because it reaches set temperature more quickly.

Voila

The limit stat is part of the control stat. It's set to about 60/65 now. Will send photo later. Thanks

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Good idea, I'll try that. Ty