Apparatus for powering the corrosion protection system in an electric water heater

摘要

A common source of DC potential is utilized to simultaneously provide power to the protective anode in an electrically heated hot water heater and to the circuit used to bias the heating element jacket to reduce the current load the jacket would otherwise impose on the protective anode. By utilizing a common DC power source, the desired voltage relationship between the protective anode, the positively biased heating element jacket and negatively biased tank wall may be maintained, regardless of changes in the supply. The need for a second separate power supply is obviated and overall construction of the system substantially simplified. The DC power source may comprise a battery or rectified AC current from the power to the heating element.