Type SOHEAT 58/1800-20 Dimension LxWxH 2020x1825x155 No of tubes 20 Weight 77.1 kg Area 3.69 m2 Absorber coating SS-AlNx /Cu Flowed through element Copper pipe/Heat pipe Heat pipe condensor diameter 24 mm Transmission of the cover tube > 91% Casing material Aluminium Sealing material Silicon rubber Insulation material Polyurethane and mineral wool Material of glazing Borosilicate glass Thickness of glazing 1.6 mm