If it is under warranty, just contact the company to diagnose and fix it. The most likely cause is a failed thermostat or element, but as the flow rate is also incorrect, it may be a control board issue. This unit only seems to be available in Australia. We are in North America :>)
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The DHE comfort instantaneous water heater from STIEBEL ELTRON guarantees high energy efficiency. Full electronic output control with 4i technology enables ...
DHE 18 AU / DHE 27 AU · Made in Germany · Precise hot water temperature up to 60°C with 4i Technology · Instant and continuous flow of hot water · Electronically ...