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Any time of the year beside the dead of winter her DIY ones will boil the water in holding tank in a blink, so you have to have the valves and temperature controls setup properly to avoid that... It's amazing what sunlight can do even in the winter for example Google up 'solar oven' with a roll...

All DIY... In time they might upgrade to a commercial system, but right now they wanted to see how feasible it was first and if it works, the good thing is all the plumbing and radiators can be up-cylced to a commercial unit, so now the house is boiler or solar heated water ready... My mom has...

With just one fan as they did you create a negative pressure (vacuum) in the heating chamber and although the chamber gets real hot, the fan can't pull the heat out as no return air duct to allowed air back in to replace the hot air coming out... You really need channel on top and bottom, so...