... the tank, providing accurate parameter. temperature feeler/Solar Water Heater Controller System is used to detect the temperature and level of ... valve and un-pressurized valve are available for selection, 9. operation pressure of pressurized valve: 0.02Mpa ~ 0.8Mpa, suitable ... 11,Increasing Water pressure during water is loaded. 12,Manual heating 13,Timing heating 14,Hot water circulation 15,Hot ...