If a Stiebel Eltron electric tankless water heater is failing to produce hot water, the issue is typically caused by a tripped circuit breaker, a malfunctioning flow switch, or a blocked inlet screen filter. Because whole-house electric units draw massive amperage across multiple heavy-duty breakers, an overload frequently trips the electrical panel. Other potential causes include water flow rates exceeding the maximum capacity of the unit's heating elements or an electronic control board failure requiring professional diagnostic testing.
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