... steel,international standard dimensionHeat exchanger in tankstainless steel, copper coilsUnit flat plate collector size2000mmx1060mmx90mm/80mmHeader pipe material & dimensionCopper T2, DN22, 2 piecesRiser pipe ... pressure6 barQuality warranty5 Years for whole systemAccessoriesElectric heater(2kW),P/T valve,Magnesium rod Domestic Style Flat Plate Solar Panel Hot Water Heating Kit