Eliosolar takes advantage of the idea that if you need a pool, you are likely in a climate where you also need some shading devices for windows to reduce your AC needs as well.

This invention solves both problems at once. These exterior louvres act to shade the house, and make hot water. Exterior shading is far more energy efficient (and pleasant!) than simply pulling the curtains or lowering blinds on hot days.

Unlike solar electricity, solar hot water heating pipes actually do not need to be on the roof. They need to be exposed to sun, yes, but they can be vertically placed on the sun side of the house, and heat up just as much. They can heat up water just as effectively on a sunshade or awning – and leave you the space that you need on the roof for electricity farming. (more…)