This book covers the design and construction of simple passive solar water heaters. In my opinion, it is easily the best book ever written on the subject. The book was published in 1981, and is now out of print and difficult to obtain. Passive Solar Water Heaters:The water heaters covered in this book make a great DIY solar project. For a few hundred dollars and a weekend of labor, you can build one of these solar water heaters. It will pay back its initial cost in a year or two. One of these water heaters can save about 4000 KWH in a year — about the same amount of energy that a 1KW PV costing around $10,000 would save! The book includes:How to design a passive solar water heater How to build a passive solar water heaterHow to install a passive solar water heaterExamples of many types of designs that would almost any situationDiscussion of potential improvements to the design