... Anti-freezen&pressurized 3. CE, SRCC, Solar Keymark Manifold Heat Pipe Solar Water HeatingFeatures:1) High efficiency solar collector using ... heat pipe evacuated tubes2) Able to be used in all ... 22mm, Thickness 1mmHeat Preservation Layer: Rock WoolSolar Absorber: heat pipe Diameter 47×1.5M(SFVB4715)Frame: stainless steel JFE443CT, ...