OEM factory since 1998 CE,ISO,CCC,SGS Samples welcome 5 years warranty and free training Features:1.Cheap and reliable solution, Simple structure, Easy installation. High-efficiency. Scientific and reasonable design. Withstand water pressure no more than 0.1MPa Operated without any power supplying Electric heater 1.5KW for heating when there is no enough sunshine,such as raining,snowy. Hot water can be used directly and higher heating efficiency Detail Specifications: Inner tank: Food grade SUS304-2B stainless steel by argon protect welding& thickness: 0.5mm;2) Outer tank:Color steel coated anti-corrosion layer &thickness:0.5mm; Insulation layer: Imported polyurethane foamed with overall high pressure equipment & thickness : 55mm;Density:36~39KG/m3; Vacuum tube: AlN-Al high selective coating tube& Absorption:í¦93%; Emittance:í_ 5%. Freeze protection:-25íµ Hair resistance: 25-35mm Bracket: hot galvanized steel painted with anti-corrosion layer &thickness:1.5mm;suitable on inclined or flat roof; Wind stress: 183.5km/h without damage All install documents are free Export cartons/ packing