It depends on your own needs. In principle, solar energy does not require electricity, but since it has a built-in electric auxiliary heater, you need to activate the electric auxiliary hot water heating when there is no of sun. electricity. If you don't need it If you start it, you don't need to worry about it, but you can't see the real-time temperature! ---Three warehouse solar water heater
Solar energy must be plugged in, otherwise the system cannot work, because electricity is needed for water supply and heating when there is no sun---Solar water at a single warehouse heating