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*The above charts represent approximate energy savings figures based on the U.S. Dept. of Energy test method for hot water heaters. The energy costs used are the 2006 averages as published by DOE - $1.42/therm of natural gas, $1.95 per gallon for propane (LP). Annual Savings1 - Compared to a new 40 gallon tank water heater. Annual Savings2 - Compared to a new 75 gallon tank water heater. Note: the annual operating cost of operating a tankless water heater will remain constant for its 20+ year lifetime, whereas that of a tank water heater will increase as its efficiency decreases over time.
*The above chart represent approximate energy savings figures based on the U.S. Dept. of Energy test method for hot water heaters. The energy costs used are the 2006 averages as published by DOE - $0.098/kWh Annual Savings1 - Compared to a new 50 gallon tank water heater. Annual Savings2 - Compared to a new 80 gallon tank water heater. Note: the annual operating cost of operating a tankless water heater will remain constant for its lifetime, whereas that of a tank water heater will increase as its efficiency decreases over time. Buying Guide For Tankless Water Heaters
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