How much energy does Whirlpool's 40 gallon Energy Smart water heater save?

The Whirlpool Energy Smart 40 gallon water heater is estimated to cost $508 in electricity per year, based on 2007 average energy costs. This is estimated to save purchasers up to $23 a year in electric costs over the water heater with the highest consumption available at the time.

The Department of Energy's 2007 estimate for electrical costs was $0.1065 per kilowatt-hour, with the Whirpool Energy Smart 40 gallon water heater estimated to consume 4773 kilowatt-hours of electricity per year under normal use. Therefore, the Whirlpool Energy Smart water heater consumes approximately 213 fewer kilowatt-hours of energy per year less than the comparable water heater with the highest energy consumption.