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Karsten, this pipe can be found in Farmers spuppliers as it is used in irrigation. Not that expensive either.I paid £10.00 for about 50 metres, it did have a stopcock fitted already which was a bonus.
Good project Andrew, if I am ever rich enough to own my own house I would like do do something similar. You may want to do a couple of things that will increase the amount of the year that it will work for..I would insulate the hell out of all the hot water pipes getting down from your panel, or on a cold sunny day you will loose all the lovely heat your panel has produced heating up the air.I would also worry, especially in Brixham, about rain getting into the panel and you using all your heat to dry out the panel rather than heat your water. And you will get condensation on the inside of your glass, reducing its transparancy...I guess the bigger problem is that you will have to shower when the sun is out... but I guess adding any form of hot water tank style heat store is going to be expensive...I am really tempted by some sort of parabolic trough based solution. As then one gets the fun of making it follow the sun, and of course it will concentrate the sun more and work for more of the year.