Water heater runs but hot water temperature is too low at all taps

Safety first: Beware of scalding when increasing temperature settings.

Step-by-step checks:

• Check set temperature: Use the control panel to verify the DHW setpoint (often adjustable between 40–60°C). Increase slightly if set too low.
• Test at a single tap: Run hot water at one tap only to see if temperature improves. If it does, the system may be undersized for simultaneous use.
• Check mixing valve: If a thermostatic mixing valve is installed near the cylinder, ensure it is not set too low or stuck. Adjust according to manufacturer instructions.

When to call a professional: Persistent low temperature may indicate a scaled heat exchanger or faulty sensor requiring service.