RE: Hot Water Tank Re-Plumb
It's not really that complicated. In my system, fresh water drawn into Shure-Flo pump - out via quite modest sized 1 litre Shure-Flo accumulator tank, then splits to hot water heat exchanger cylinder and to cold supply. No check valve - no hot water gets into the cold system. I suspect the constant pressure maintained in the line down-stream of the hot/cold divide prevents hot water back-flow.
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