Hm. Maybe so. Maybe the extra water being put into the cold water lines will feed back into the hot water tank. Honestly, I'm still a little unclear on how the house's pressure defeats the municipal pressure in any case.
When the water is heated, it expands. If it's a closed system, that means water can be pushed back into the mains. This is a big no-no in UK plumbing regulations, and probably elsewhere too. Traditional UK hot-water systems (and heating circuits) have an open pipe venting into the cold-water tank in the loft for expansion overflow.
Peter
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