If we are storing for more that 1 week I drain the water tank and open the low point drains and open fixtures. I have had water shunk and start algae growing in the tank and it's no fun getting things back to clean. I also pull the anode out of the WH to drain it.
Early Spring of Fall when the temps are cooler I do leave the tanks with water longer but when it's hot I don't.
John
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