Water from a Heatrae Sadia cylinder smells unpleasant (sulphur/rotten egg odour).

Safety first: Raising water temperature to disinfect can increase scald risk. Use caution and appropriate mixing controls.

Steps to improve water quality:

• 1. Thermal disinfection (where permitted): Temporarily raise cylinder thermostat to 60–65°C and maintain for several hours to help kill bacteria. Ensure outlets are protected by thermostatic mixing valves to prevent scalding.
• 2. Flush cylinder: After heating, draw off several cylinder volumes of hot water through all outlets to flush the system.
• 3. Check usage patterns: Avoid leaving the cylinder unused for long periods. If the property is vacant, consider draining the cylinder.
• 4. Professional treatment: If odour persists, consult a water treatment specialist or Heatrae Sadia service agent. In some cases, component changes or system disinfection may be required.