Here's a complete book on building passive solar water heaters that you can download for free.
Photo: David Monniaux
via Creative Commons Wikimedia
This PDF document is the complete illustrated text of The Integral Passive Solar Water Heater Book (ISBN 0933490038). This 104 page (8.2MB) book starts with basic design principles and takes you right through the complete details of plumbing and installation of a passive solar home hot water system. The build-it-yourself chapter even covers such seemingly incidental topics as how to safely get the components up onto your roof.
Having a solar water heater like one of the designs presented in the book, will not only pay for itself in electricity savings in a year or two, but will keep right on delivering hot water even when the power goes out for any reason.
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