... tank, providing accurate parameter. temperature feeler/Solar Water Heater Controller System is used to detect the temperature and level of ... valve parameter: DC 12V, AC 220V, pressurized valve and un-pressurized valve are available for selection, 9. operation pressure of ... 0.8Mpa, suitable for providing water directly operation pressure of un-pressurized valve: 0.0Mpa, 10. connected with water tank ...