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re: is efficiency dangerous ? not for a drainback system
2 nov 2005
q wrote:
>there isn't much reduction in current draw from siphoning that i've seen.
anyone tried a kill-a-watt meter with a valve to restrict downward flow
and keep the return pipe full?
powertech in the uk uses a 2-speed pump in an unpressurized tank with supply
and return pipes underwater. eric hawkins starts it up on the high speed,
waits till return bubbles stop, then switches it to low speed forever after.
he says his installations have operated for years this way sustaining the
partial vacuum above with no need to reprime the collector loop, even tho
there is fresh hot water in the loop with opportunites for cavitation and
release of dissolved gases. i suppose the pump operates often enough (with
no more than about 5 cloudy days in a row) to avoid a buildup of air.
nick
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