FCS-3277, a 6-page fact sheet by Wendell A. Porter, Hyun-Jeong Lee, and Kathleen C. Ruppert, answers homeowner questions about water heaters, which can account for one-third of the energy expense for a home. It describes factors to consider when purchasing and the various choices available. Includes references. Published by the UF Department of Family Youth and Community Sciences, June 2008.
http://edis.ifas.ufl.edu/FY1025