Sacrificial Magnesium Anode

The magnesium anode, also called the “sacrificial” anode, prevents any stray currents that form inside the tank from triggering corrosion processes on the surface.

Get quoteMagnesium is in fact a low-charge metal compared to the material which coats the inside of the tank, and therefore draws first the negative charges which are formed by heating the water, consuming it. The anode, then “sacrifices” itself, corroding the anode instead of the tank. The sacrificial anode is designed to the progressive consumption over time and therefore it must be replaced periodically.

Its development is the electronic anode (more expensive, requires power and is not recommended for outdoor tanks, but is never replaced).