One valve is installed at the water inlet of the electric water heater, and another valve is installed in the downpipe of the solar water heater. Above the stock water supply valve there is a tee between the two valves. connect the public hot water pipe.
Use an electric water heater to close both valves installed on the water pipe of the solar water heater at the same time.
When using a solar water heater, close the water inlet valve of the electric water heater and open the newly installed valve on the water pipe of the water heater solar.
Simply install a valve on the solar sewer pipe and connect it to the electric hot water. When the electricity is on, the solar panel will be off, and if the solar panel is on, the solar panel will be off. the electricity will be cut off. The solar water inlet is installed under the basin. Simply connect cold water and hot wateraude and press the solenoid valve in the middle. Close the hot water valve and the electric water heater can open the solar hot water valve to fill the water.
It is necessary to add manual valves to the tap water pipe of the solar water heater and the hot water outlet pipe of the water heater.
When you want to use hot water from solar energy, close the valve on the hot water outlet pipe of the electric water heater and open the valve of the solar pipeline. When you want to use hot water from the electric water heater, close the valve of the solar water pipe and open the valve of the hot water outlet pipe of the electric water heater.
Of course, the principle is that the water pipes of the two water heaters must be designed and installed in parallel.