... for vacuum tube 3,MIN 1set CE certificate non pressure solar water heater 1.CE certificate ,ISO9001-20002.15YEARS warranty for vacuum tube ... and plastic spraying coat, thickness:1.5mm,angle:15degree;6.accessories: screws and nuts, material: stainless steel;7.hailstone resistance: 25mm ... sunning,performing a strong heating ability. CE certificate non pressure solar water heater