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Derek Broughton · 20-10-2008, 07:35 PM posted to rec.ponds.moderated

wrote:

pex? plastic? it is an insulator. metal is the best conductor.

Of course it is, but if you push the hot water through a lot of 1" plastic,
_plenty_ of heat will be extracted. If that solar DHW system was used for
in-floor heating, that's exactly what they'd use (well, likely only 1/2" or
3/4" - but then concrete conducts heat about twice as well as water).

remember, cold doesnt seep out, heat has to spread in.

You're not trying to get cold to seep out - you're radiating heat. 40' of
1" PEX would pretty well guarantee the heat all getting to the pond.
--
derek