Junkers
Corrosion / Rust Contamination
Hot water has a metallic or rusty color when first opened.
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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.
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Possible Causes
Corroded internal heat exchanger, Rusty steel piping in the installation, Long periods of disuse causing stagnant water
How to Fix / Troubleshooting
Safety: Discolored water is usually a quality issue rather than a safety hazard, but investigate promptly.
- Flush system: Run hot water for several minutes to see if discoloration clears.
- Compare cold vs hot: If cold water is also rusty, the issue is likely in the building piping, not the heater.
- Inspect heater age: Older units with steel components may have internal corrosion; consider replacement.
- Service inspection: Have a technician inspect the heat exchanger and advise on repair vs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger / Domestic Piping
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