On Jun 21, 10:03*pm, "Dave Liquorice"
wrote:
On Sat, 21 Jun 2008 17:47:37 +0100, MM wrote:
I've made the first stage, i.e. the copper tube, about 3 metres of it
in a "snake" pattern.

Not long enough unless soldered along all its length (not spots here and
there) to some other form of collector plate a couple of square metres in
area, even then the spacing would be to high to have effcient transfer of
collected energy into the water.

Or will this plastic release toxins when containing hot water?

With your very poor collector it's not likely to get hot enough to deform,

yes This might be a start:

http://www.wiki.diyfaq.org.uk/index....=Solar_Thermal


NT