Hot water has a metallic or rusty color when first drawn from taps connected to the Nibe water heater.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety first: Let discolored water run until clear before use. If water has a strong odor or particles, avoid consumption until inspected.
- Step 1 – Flush system:
- Run hot water from the lowest tap until it clears; observe if discoloration returns after standing.
- Step 2 – Check anode (if fitted):
- Many Nibe cylinders use a sacrificial magnesium anode. Have a technician inspect and replace the anode if heavily consumed.
- Step 3 – Inspect cold supply:
- If both hot and cold are discolored, the issue may be in the mains or building pipework rather than the cylinder.
Persistent rust-colored water from hot taps suggests internal tank corrosion; plan for cylinder replacement if confirmed.
Repair Difficulty
Required Part
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