If your Stiebel Eltron water heater is not getting hot, there are several common causes to check systematically before calling a technician. For Tempra tankless models, the most frequent reason is insufficient electrical power: these units require two or three dedicated 40 to 50 amp double-pole breakers, and if one breaker has tripped, the unit will run cold or lukewarm. Check your main electrical panel and reset any tripped breakers. Second, check water flow: tankless heaters need a minimum flow rate of around 0.5 gallons per minute to activate. If your faucet aerator is clogged or the filter screen in the unit is blocked with sediment, it will not trigger heating. Third, the high-limit safety cutout may have tripped due to overheating, which requires pressing the reset button inside the unit. Other causes include a failed heating element, a faulty temperature sensor, limescale buildup in hard water areas that insulates the heating chamber, or incorrect temperature setting on the dial. For wall-mounted storage heaters, a failed thermostat or heating element is common. Always turn off power at the breaker before opening the unit, clean the inlet filter, and consult the manual for your specific model.
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