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re: is efficiency dangerous ? not for a drainback system
4 nov 2005
"greg campbell" wrote:
>... the main tank, or heat exchanger, is sealed and slightly pressurized
>by the static water head.
so... if the main tank is say, 16' below the er, it is slightly pressurized
by about 0.433x16 = 7 psi, ie 1000 psf, so the top of a 4'x8' main tank
would need to resist 16 tons of uplifting force? :-)
the main tank might have a big coil of pe pipe on the bottom, with no er...
nick
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