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Thank you for such a speedy reply. Will print this off and speak to our plumber. The tank is about 4ft high and I think the immersion heater in there is about 27" high so not sure this is the answer but certainly worth looking into. Thanks again.

In our old house which we built about 30 years ago we had an immersion heater that could be used two ways. Either to heat half a tank of hot water or heat the whole tank. There was a sort of 'rocker' switch on the top of the tank. 2 years ago we moved and the immersion heater here is on off...