Certification(s): CE, ISO9001, CCC, EN12975, Solar Keymark Solar water heater Specifications: 1) Inner tank material: SUS304-2B, thickness: 0.4mm 2) Vacuum tube: 15, 16, 18, 20, 24 and 30 pieces of tubes are available 3) Insulating layer: Polyurethane foam, thickness: 55mm 4) Hail resistance: 25mm Primary competitive advantages: 1) CE, CCC, ISO9001: 2000, EN12975, Solar Keymark approval 2) Good price and quality 3) Prompt delivery 4) Environmental Protection 5) OEM order is accepted 6) Experience of export to 86 countries