My last house had a vacation setting on the temperature (thermostat) of the tank. If yours does not I would just turn it down to the lowest setting with the water off it should be fine. Make sure you take a picture or note down what setting it was on before turning it down. Also note, I would not extinguish the pilot light as if you forget to turn off the gas…..boom.
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I will say the things that others are probably thinking but afraid to say.
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