1.Vacuum tubes: common tubes or three-high tubes(47-1500mm or 58-1800mm) 2.Outer tank: Dia of 460mm with material of colorful steel plate at thickness of 0.326mm 3.Inner tank: Dia of 360mm with material of Food grade stainless steel SUS304 2B at thickness of 1.2mm or 1.5mm 4.With Copper Coils inside the inner tank. 5.Capacity of tank: 100L to 350L 6.Pressure bearing: 0.6 Mpa 7.Insulation: Polyurethane foam, thickness: 55mm 8.Stand: Galvanized plate at thickness of 1.5mm Features: • CE,ISO9001and CCC Certificates. • Reliable, efficient, twin-glass • Copper Coils in inner tank • Simplistic plug-in installation • Minimal maintenance required • Water tank acts as a thermal source with copper coil as heat exchanger inside tank • Food grade Stainless steel SUS 304-2B for Inner Water Tank • Internationally certified product • Ideal for residential and commercial solar water heating applications