> buildings, because the pipe-run distance from one side of the
> house to the other can be very large, so the waiting time and the
> waste of water are
> large too.
i think the general feeling in the uk was that the wasted water from having
a normal system was less significant than the wasted heat from a secondry
circulation system like this and it stopped being used in new installations
(at least residential ones). I've seen lots of commercial setups that seem
to use this method though.

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