I'm under the impression that you should run cold water only through your RO/DI....I then put it in a stainless steel pot on the stove and heat it up to tank temp before adding it.
I plan to build an auto-topoff system when I upgrade my tank size, but for now I do it manually. It seems to me that the auto system wouldn't add enough water directly to the tank at any one time to be a problem.
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CCPMC of HETMARC
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