Heaters type EJK maxi version are used to heat water in open and closed tanks made of metal, in particular in enamel tanks for hot water. In those reservoirs protected against corrosion with cathode method of magnesium anodes, heating elements should be partly or completely electrically isolated from the walls of the tank. As a result, the electrochemical potential difference in filled with water tank between the heating elements made of copper or a special stainless steel and the container made of carbon steel, partially leveled. This significantly increases the service life of the heating element and magnesium anode lifetime.

In heaters type EJK maxi version heating elements are placed in the head of metal. For the partial merger between heating element and tank combines grounding resistor with properly selected resistance, which includes these elements for cathodic corrosion protection of the tank. This solution gives several advantages: protects electric heater inside enamel tank against electro-chemical corrosion, while maintaining the tank cathodic protection and magnesium anode lifetime.