you must use the water valve on the solar air heater to limit the pressure and add water

When the weather is extremely hot and the water temperature is extremely high, you must use the water valve on the solar air heater to limit the pressure and add water. It is strictly forbidden to add water after the water is used up. Try to water before sunrise in the morning or after the sun sets in the evening, so as to ensure the service life of the solar air heater. Each solar air heater has a vent hole. When the water is full, the number of water outflows is normal. It will stop after closing the water valve on the solar air heater. (Solar air heater installed with water temperature and water level indicator will not appear in this situation).