How much in energy savings can I expect? What does it cost to operate on an annual basis?
Because the Stiebel Eltron Tankless Water Heater eliminates the "stand-by" method of heating water and operates on an as-needed basis only, you will save money on your hot water heating costs, even if you replace a gas water heater.
Typical savings enjoyed are in the range of 20 to 30% with replacement of a gas water heater, and the range of 40 to 50% with replacement of an electric water heater. With natural gas prices continually rising, we expect savings on replacement of gas tanks to increase to the 40% range. The average cost of operating a Stiebel Eltron tempra tankless water heater in the USA for one year (based on a family of four) is only about US$200.