The United States Department of Energy has a great website that has very useful information on saving energy and what products are the best! I have always been interested in tankless hot water heaters (demand water heaters) and just wanted to spread the word about these. We have installed these before for our customers and it has saved many of our clients money! Basically tankless hot water heaters heat water instantly rather than storing up hot water in a tank. The website below will provide you some more great info on this and other great energy efficiency products.
If the above link does not work you can always just search under http://www.eere.energy.gov/ and search for more info. Thanks and I hope you find this website interesting.