Standard storage tank water heaters remain the most popular method of heating water in the home today. A single-family natural gas storage water heater will typically store between 20-80 gallons of ready-to-use hot water and will lose energy keeping the water hot between uses. According to Energy Star, an Energy Star qualified model will usually save about $30 per year, or $360 over the water heater's average 13-year lifetime. Homes or properties with above average usage will have increased savings. Energy Star estimates that the United States could prevent one billion pounds of carbon dioxide from entering the atmosphere per year if everyone purchased an Energy Star qualified model.
When shopping for a gas storage water heater, the energy factor (EF) indicates a water heater's overall energy efficiency. The higher the energy factor, the more efficient the water heater is. Please visit Energy Savers for additional information.
To estimate your potential to save energy and money by installing this improvement, please see the U.S. Department of Energy's Home Energy Saver calculator.