The Stiebel Eltron DHC tankless water heaters are designed for installation at the point of use. They heat water instantaneously as water flows through the unit. With the Stiebel Eltron DHC Heaters, stand-by losses are completely eliminated. The heating elements are controlled by a flow switch and by an exclusive scald-guard thermostat, which keeps the water temperature within safe limits at all times. In addition, the DHC water heaters are equipped with a safety high-limit with manual reset. The rugged all copper design of the Stiebel Eltron DHC Heater ensures many years of reliable service.