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Question: I heat my water for washing with natural gas. I have both a tank type water heater and a tankless water heater. They both sit in the basement under my living room. I can easily switch to either using one of them or both of them to heat my water. During the summer the tankless is sufficient for my needs but not in the winter when the incoming water is very cold. Does it pay to completely drain the tank heater during the warmer months of the year when I will not use it or will it corrode more than with water in it?
Answer: In winter feed water: in from supply, tankless, tank heater, fixtures. in summewr reverse this so incoming water first goes thru non heated tank heater : in from supply, tank heater heater off, tankless, fixtures. just a few valves can do this easily. I would keep the water flowing thru that tank at all times
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