Hot water has a rotten egg or sulfur smell when using taps supplied by the Nibe water heater.

Safety first: High temperatures used to disinfect can cause scalding. Ensure mixing valves are functional and warn occupants before raising temperatures.

• Step 1 – Increase temperature temporarily:
  • Raise the hot water setpoint to 60–65 °C for 24 hours to help kill odor-causing bacteria.
• Step 2 – Run a legionella cycle:
  • If your Nibe model supports it, run a legionella protection cycle according to the manual.
• Step 3 – Flush hot water lines:
  • Open all hot taps and run water until hot to flush the system.
• Step 4 – Anode check:
  • Have a technician inspect the magnesium anode; in some cases, replacing it with an alternative anode type can reduce odor.

If odor persists, water quality testing and consultation with Nibe or a water treatment specialist may be necessary.