... for your family,from 80L~500L for your choice.4) For the system with double coils in tank,it can operate with ... ;2). Outer-tank: Color steel with anti-corrosion layer& 0.4~0.5mm3). Insulation: Imported Polyurethane overall foaming under over 25C ... : 1.2Mpa)Working principle:Installation Case: Solar hot water heating system,SRCC,Solarkeymark,ISO9001,100L~500L