Anode for Hewalex eK series heat pump heaters 83.30.37

Corrosion protection in heat pump water heaters

The magnesium anode is a key protective element in modern water heaters equipped with heat pumps. Its main task is to prevent electrochemical corrosion of the heater surface and all fittings in contact with domestic water.

Operating mechanism and corrosion protection

Various materials—steel, copper, or brass—are used in water installations, which are characterized by different electrochemical potentials. In a water environment, corrosion microcells are formed, leading to the electrochemical corrosion process. The magnesium anode functions as a protective element that mitigates the potential differences between metals, thereby protecting the surface of the enameled tank.

The cooperation of the magnesium anode with the enamel layer creates two-stage protection—the enamel acts as a physical barrier, while the anode provides electrochemical protection in areas of potential coating damage or microcracks.

Technical dimensions and maintenance

The anode has been precisely matched to the specifics of the eK Hewalex series heaters:

• Total length: 420 mm ensures optimal contact surface with water
• Diameter: 18 mm guarantees stable mounting and an appropriate conductive cross-section
• Thread: 3/4" enables secure attachment to the heater body

Due to the nature of the material and operating conditions, the magnesium anode is a consumable component subject to natural wear. The degradation rate is not uniquely defined—it depends primarily on the hardness of the domestic water and the intensity of the device's operation.

Recommended inspection schedule:

• Inspect the condition of the anode once a year
• Replace when wear exceeds 2/3 of the initial volume
• Mandatory replacement no later than every two years

Regular replacement of the anode not only protects against corrosion but is also a condition for maintaining the warranty of the water heater manufacturer.

A correctly operated magnesium anode extends the lifespan of the entire device, reducing repair costs resulting from corrosion damage. Its role is particularly important in heat pump systems, where high energy efficiency goes hand in hand with the requirements for the durability and reliability of heating installations.