Detailed directions and have free hot water even if the electricity is outside. A purely simple method to do it yourself. No pumps or controls wholly passive. We begin with the glass from old sliding glass doors and use a water heater as storage tank. I got the glass and tank free of charge. View me make it step by step. Excellent science job. We sell glass and frameworks also. Have a look at my other video on making an easy wind turbine.

Construct Your Own Backyard Coop: