Heater corrodes prematurely or shows rusting on external metal parts.

Safety first: Turn off power before cleaning or treating corroded areas.

• Address leaks: Fix any water leaks from unions, valves, or pipework that are wetting the heater casing.
• Improve environment: Increase ventilation and reduce chemical storage near the heater. Avoid directing chlorinated air from dosing systems at the unit.
• Clean and protect: Remove surface rust with a non-metallic abrasive pad and apply a suitable protective coating as recommended by Elecro.

Severe structural corrosion may require replacement of the heater casing or complete unit.