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If you're only worried about the water heater, then you can turn it off and drain it. Shut off the gas You should see a gas pipe connected to the unit. It will likely either be rigid black pipe, or flexible yellow pipe. Follow that pipe until you find the shutoff valve. It should be a quarter-turn ball valve, so you'll only have to turn it a quarter turn ...


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A proportional temperature controller will accomplish this task. They are used in industry to do exactly this. Here is an excerpt from Omega.com: Proportional Control Proportional controls are designed to eliminate the cycling associated with on-off control. A proportional controller decreases the average power supplied to the heater as the ...



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