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re: heat recovery
14 jan 2003
iain blackie wrote:
>in the shower the other morning, it occurred to me i was throwing water
>at 40c down the plughole and drawing cold water at 5c to replace it.
>sounds like time for a heat exchanger to get back say, 80% of the
>difference and pre-warm the incoming water.
good idea. i've been thinking of putting an 6"x8' horizontal pressurized
cold water thick-walled pvc pipe inside an 8"x10' unpressurized thin-walled
greywater pipe that drains to the sewer through a large bulkhead fitting.
mcmaster-carr sells 10' of 6" pipe for $56.61 and 6" caps for $9.75 each.
the cold water might enter the 6" pipe via a reinforced garden hose, then
flow into the water heater via the drain fitting. who sells 8" dwv pipe?
nick
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