I have a chance to get a couple of used Andersen non opener sky windows I am wondering if anyone has ever made a solar water heater out of one before. Has anyone got a good design for one. At the present time I would like to try heating my water for hot water only, maybe down the road hook up one to heat my boiler water. I went to the fair yesterday and the guy selling systems there gave me a price of 7 to 10 grand installed. It would take a long time to get any payback.