Eemax Internal Corrosion / Electrolysis

Visible corrosion or green/white deposits on copper pipes and fittings inside the Eemax heater.

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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

Persistent small leaks, Aggressive water chemistry, Improper grounding or bonding, Dissimilar metal contact without dielectric isolation

How to Fix / Troubleshooting

Safety: Turn OFF power and water before working inside the unit.

Mitigation steps:

  • Inspect all copper joints and fittings for active leaks. Repair or replace any leaking fittings.
  • Clean corrosion with a wire brush and a mild vinegar solution, then dry thoroughly.
  • Verify that the unit is properly grounded and bonded according to Eemax and local code requirements.
  • If dissimilar metals are present (e.g., copper to galvanized), install dielectric unions to reduce galvanic corrosion.
  • Consider having your water tested; if highly corrosive, install appropriate water treatment.

Severely corroded heat exchangers or fittings should be replaced to prevent leaks and failures.

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Repair Difficulty

Medium 3/5

Required Part

Heat Exchanger Assembly
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