Arny Krueger wrote:

"Roger W. Norman" wrote in message


Yes there is. All water heaters have an active electrical connection
because no water heater would heat water without it.

You never heard of gas water heaters?

There are gas powered water heaters that use no external electricity.
The tiny amount of power needed to operate the thermostat is provided
by a thermocouple heated by the pilot light. Newer ones actually have
a small generator in the water flow, and only turn on when the water is
running.

--Dale