Unused water heater, leave full or empty?
"TomR" wrote in message
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I am not sure, but I think that technically speaking that approach
won't save any money on energy costs. The reason is that for the
water in the first tank to be brought up to room temperature, it
needs to draw its heat energy from the room. So, it will cost that
much more to heat the room because some of the room heat is going
toward heating the water in the first tank. In other words, there
is no free heat -- it either gets its heat from being heated by at
working hot water tank, or it gets its heat from the room and that
heat energy needs to be replaced by the heating system for the room.
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