How to Build a Passive Solar Water Heater

Learn how to build a passive solar water heater. A solar heater can be simple to construct and reduce your utility bills. We’ll explore the various types of solar water heaters, and learn to build an easy and affordable model.

A collector with multiple tanks, like this vertical batch heater, can produce much of the hot water a small family needs. Adding an insulated cover to the collector conserves heat and can also function as a reflector.
Illustration by Dave Channon