The anode is a magnesium rod [Φ22Χ40mm] and serves as the cathodic protection of the system against electrolysis. It is a method of protection against the corrosion of metals that come into contact with corrosive materials, such as water.

Cathodic protection is achieved by the addition of the anode, which corrodes in place of the protected metals. The use of magnesium anodes of German specifications is the most suitable method of protection for water heating and solar installations, both in terms of technology and hygiene.