Learn more about the various types of solar water heaters-and how to build your own affordable water warmer-with guidelines from David A. Brainbridge, who received the American Solar Energy Society's Passive Solar Pioneer Award in 2004.
All you need is a discarded electric water-heater tank, a homemade insulated plywood box for housing the tank, a sheet or two of used window glass (or clear plastic), a few common plumbing fittings, some pipe, and a bit of insulation. Before you know it, you'll be ratcheting up savings on your utility bills with your continuous supply of virtually free hot water. ::Mother Earth News and ::Build It Solar
Difficulty level: Advanced