... is combined with solar collector, pressurized storage tank, intelligent controller, solar station, expansion vessel, pipeline etc. 1. ... SR962 …solar working station. 4. SR868, SR868C8Q…temperature differential controller CE EN12975 KEYMARK Split Pressurized Solar Water Heater Working ... C)Vacuum degreeP≤5.0X10-3(PA)Stagnation temperature (temperature inside of empty evacuated tubes)260~300 °CAverage ...