I remember watching This Old House and they had a plumber install a
solenoid in the supply line of a water heater. The solenoid was hooked
up to a float in the safety pan underneath, if the pan filled with
water, the solenoid would cut the water supply and hopefully your
basement wouldn't be an oversized heated swimming pool. Anyone know of a
source for this setup? Many TIA.....
If you spring a little leak (most common, I think) the tank will hold
water for a long time. If you spring a big leak, the pilot will be
doused and the gas valve will shut off the gas. Even with small
leaks, commonly the pilot is either doused, or the thermocouple cooled
enough to shut off the gas.
In any case, the gas control has an overheat sensor protruding into
the tank. In the case of a dry tank, the sensor (switch) opens and
cuts off the thermocouple circuit. This is a one-time device/
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