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Bob Mannix typed:

A couple of years ago, I couldn't find DIY solar water heating kits
(you could build your own manky system Blue Peter style, giving the
satisfaction of true DIY but little else,

Er
But that costs £1.9k, my Blue Peter DIY one cost £25 its been working for
over 15 years and tonight mid January ive got water at 26.4c in the
collector tank, from water at 8.5c.
sense people ingenuity money some lacking. ;-(

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Mark