You get ready for a nice hot shower, only to find that your kids have already used up the hot water. Sound familiar? It doesn't, if you have a propane gas water heater. Propane gas water heaters have nearly twice as fast of a recovery rate, so you get more hot water from the same size tank. They also cost about $10 less per month than electric water heaters. And since, according to the U.S. Department of Energy, water heating accounts for approximately 20 percent of an average household's energy expenditures, the savings can really add up. In fact, over an average unit's life span, propane gas water heaters can save homeowners nearly $2,000 when compared to an electric unit.