How do solar water heaters heat electrically?

Solar Water Heater Electric Heating:
1. Set the maximum water temperature to about 60 degrees;
2. When installing solar energy, the two terminal points of "electric heating" on the controller have been connected to the two terminal points of electric heating of the solar water tank with wires;
3. Press the "Electric Heating" button on the controller once, that is, the heating icon will be displayed and the heating will start;
4. When the set water temperature value is reached, the controller will automatically cut off the power supply of electric heating.