Response to Hello, Normally all units come with the instructions on winterizing, these are different with each heater, but turn off you gas, make sure ignitor is off, instructions may only say to remove the drain plug. You can (if you would like) blow compressed air through the heater with the drain plugs removed until you see no misting come out of the drains. Then pause the air flow and do it again. And maybe again. You want to get as much water out of the heater element as possible. Only use about 20-30 psi if you're using a compressor. Again this is different for each type of heater, please follow owners manual instructions.

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