Here's a real simple one...
New construction building where water supply to the entire house was shut
off at the main valve in the basement where water service enters the
building. Is there a need to turn off the gas, hot water tanks also ? The
tanks were full of water at the time water service was shut off.
I think it is a bad idea to have any active energy source going to
a hot water heater , gas or electric, when the water supply is shut
The most obvious is that leaks may occur and the water will be lost,
and the tank element, or heat channel, will burn up since there is no
You can probably get away without energy shut-off, especially if it
only for a few minutes or a couple hours, but need to be aware of
I routinely shut off the water and power to my water heater at camp (
electric ) and the pump to the well. When I return I repower the well pump
( usually will not kick on since it has held its pressure ) and then turn on
the kitchen hot water tap which is above the heater to make sure the system
is full of water. With the hot water tap still flowing I then flip the
switch on the water heater to on and return to the tap to turn it off. This
works for me and I would not think of doing it any other way. Hot water
tanks don't work good or for long if they are not full of water.
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