The Water Heater Workbook is the bible of water heater maintenance. It was written by Larry and Suzanne Weingarten with many illustrations by John Middleton.

There are sections on how water heaters work, gas and electric controls, judging a tank's condition, anode replacement, sediment control, tankless heaters, solar equipment, heat pumps and much more, as well as an excellent troubleshooting guide.

The book is designed with a spiral binder that permits it to lie flat when opened, so you can read it while working on your water heater.