nice hot day.

Since the interesting discussions on solar PV, am now pondering DIY
solar water heating possibilities, anyone care to share? or links,
pointers, suppliers (good/bad/cheap/expensive) all (constructive)
suggestions welcomed..

trawled on here first and been reading about Solartwin (seems ££££?)
and Navitron DIY kits - any experiences? other suppliers? other ideas?

TIA
Jim K