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april 2011

Electric resistors for water heaters and the problem of system corrosion

Electric resistors for water heaters made of pure copper to limit the effects of corrosion

Electric resistors for water heaters induce vagrant currents into circuits which can favour spot corrosion. This damages the system components, starting from the electric resistors and ending with the boiler walls.
Sacrificial anodes of magnesium are usually installed to protect these components. The anodes, which can be easily replaced, corrode in place of the other components.
In heating systems, in fact, conditions exist that favour corrosion because of spurious currents. These conditions are tied, firstly, to the minerals present in the water which tend to favour electrolytic reactions. Indeed, the harder the water, the more this phenomenon intensifies. In an open circuit, like one for hot water, the phenomenon is difficult to control so softeners are usually placed at the water inflow points to prevent it.
Another two factors that greatly influence the situation are the water flow temperature and speed.
The electric resistors for water heaters in the catalogue are already prepared for the installation of these anodes. To limit their corrosion, instead, our electric resistors for water heaters are made of 99.9% pure copper.


See also
11/01/2017 Seals between the parts of electric resistors A hermetic seal between the parts of an electric resistor guarantees safety

11/08/2017 Electric resistors for heating as a multipurpose spare part Electric resistors for heating fluids, built to be reliable spare parts

11/03/2013 Electrical resistors' characteristics The electrical resistors are used to heat up fluids, such as water, inside boilers or water heaters and work at relatively low temperatures.

11/03/2015 A controlled process for the production of tubular electric heaters The assembly of the tubular electric heaters with components manufactured on last generation machines ensures their durability.

11/06/2013 Various applications of electrical resistors Heating of water lies in electrical resistors that, in different dimensions, ensure an adequate heat flow

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