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Would Anyone know how to reset or set the historesis on a gas Hot water system. my hot water cools too much before it comes on to reheat. I mean its almost tepid before it comes on, is it by the tank somewhere or is it by the gas heater, there is a box there to select the water temp, which is...

My hot water system works OK, as far as the Radiators are concerned. But the hot water isn't staying hot the whole time I have it programmed for, most of the time. It seems that there must be a temperature that it comes back on to reheat the water, but this must be set very low and erratic...