On Mon, 07 Jul 2008 10:49:59 -0700, Andy Dingley wrote:

Anyone got useful experience or recommendations for links / books
reading on _very_ low capital cost solar heating for space-heating of
workshops?

....

Swimming pool solar panels - which presumably have to generate large
amounts of heat but at a low temperature rise - use black twinwall
polycarb sheet, with water running through the channels in the sheet.
There's an arrangement of a sort of slit pipe enclosing the top and bottom
edges for feeding water in and out. DIYable if you get ornery twinwall and
paint, I guess, or the material might be cheap enough from whoever makes
it for pool heaters.

I presume you're going for underfloor heating to make best use of low
temperature heat and avoid trying to heat the air as well as the H-A-Cs.

--
John Stumbles

What do you mean, talking about it isn't oral sex?