Cathode protection water heater with impressed current

The utility model relates to a cathode protection water heater with impressed current, which is provided with an additional power supply, an auxiliary anode connected with an anode of the additional power supply and an inner stainless steel barrel connected with a cathode. Compared with traditional solar water heaters, the cathode protection water heater further adds the additional power supply, and can provide electron to the inner stainless steel barrel of the water heater continuously, thereby effectively preventing iron in stainless steel from becoming Fe 2+ to produce rust. Ca 2+ in water can be continuously gathered on the auxiliary anode of the stainless steel to produce incrustation scale, and the Ca 2+ in the water is less, thereby achieving a purpose of softening water quality. Due to a fact that the auxiliary anode uses a stainless steel material, through a cathode protection method of the impressed additional power supply, a cathode inner stainless steel barrel is not easy to rust, the incrustatio