Ariston Internal Corrosion / Anode Depletion

Ariston water heater's hot water appears rusty or discolored.

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

Depleted anode rod, Corroding steel tank, Rusty plumbing upstream, Sediment accumulation in tank

Safety first: Allow water to cool before draining.

Check if discoloration is only on hot side: Run cold water; if clear, the issue is likely the heater or hot piping.
Flush tank: Drain and flush until water runs clear.
Inspect and replace anode rod: Remove the anode and replace if it is less than 10–20% of original diameter.

If rust persists after anode replacement and flushing, the tank may be nearing end of life and require replacement.

Medium 3/5

Magnesium Anode Rod

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