Junkers Bacterial Contamination / Sulfide Reaction

Hot water has a strong rotten-egg (sulfur) smell.

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

Bacteria in water supply reacting with magnesium anode (for storage-type Junkers heaters), Low water turnover, High sulfur content in source water

Safety: Odor is unpleasant but usually not directly harmful; address promptly.

Flush tank (storage models): Drain and flush the storage tank thoroughly according to the manual.
Disinfect system: A professional can chlorinate or thermally disinfect the system.
Replace anode: Consider replacing the magnesium anode with an aluminum/zinc anode if compatible.
Increase temperature: Temporarily raising storage temperature (with caution) can reduce bacterial growth; follow manufacturer limits.

Medium 3/5

Magnesium Anode (Storage Water Heater)

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