How do I turn on a Stiebel Eltron heater?

How you turn on a Stiebel Eltron heater depends on the specific model you own, as the company makes many different types including instant tankless water heaters, wall-mounted room heaters, and heat pumps. For a Stiebel Eltron Tempra tankless electric water heater, there is no on switch; it turns on automatically when it detects water flow, so you simply turn on the hot water faucet and the unit will activate, modulate its power, and heat the water. For a Stiebel Eltron wall-mounted electric room heater, such as the CK or CKT series, you turn it on by using the main power switch on the side of the unit, then set your desired temperature using the thermostat dial or digital display on the front. Many models also have a timer or programmable weekly schedule you can set via buttons. For a Stiebel Eltron heat pump system, you turn it on via the central heat pump manager controller, usually an ISG or WPM unit mounted on the wall, where you can select heating mode and temperature. Always ensure the circuit breaker is on, and refer to the user manual for your exact model for step-by-step instructions and safety precautions.