Thermal solar heating spa

[Maxmat]

hi I have just got hold of a thermal setup, with a view to heating the hot tub, it is twin coil tank , solar will be plumbed in as normal and hot tub connected to what would be the boiler coil, water in tank will be stationary, any one else done this will it work?

[J.P.M.]

See builditsolar.com for ideas and what others have done. Just don't take all of it too seriously until you educate yourself as to what's safe and what isn't. Lots of good stuff, but lots of redneck engineering that may be unsafe besides wasting more time/energy than it saves.