... family,from 80L~500L for your choice.4) For the system with double coils in tank,it can operate with traditional ... on,during raining.snowing,or cloudy.5) Adopts the closed loop, operating under the pressure.6) Intelligent control and automatic operation ... : 1.2Mpa)Working principle:Installation Case: Solar hot water heating system,SRCC,Solarkeymark,ISO9001,100L~500L