This spring the U.S. Department of Energy mandated new efficiency standards on water heaters. This means water heaters manufactured after April 16, 2015 may have more sophisticated designs and may potentially be larger than previous models.
The new regulations require a higher energy factor (EF) rating on gas, electric, oil, and tankless water heaters. On a water heater, the energy factor (EF) indicates the overall energy efficiency, based on the amount of hot water produced per unit of fuel consumed in a typical day. The higher the EF, the more efficiently the water heater converts power into hot water while reducing losses… and the more money you save on overall energy costs.
For homeowners the good news is the new water heaters save more energy, increase performance and efficiency over the life of the system, and lower operating costs. Read more here: http://bit.ly/1bbMfs5
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