Compact series solar water heater 1. solar water heater Inner tank: High quality imported SUS304-2B food grade stainless steel. 2. solar water heater Outer tank: Imported good quality SUS201 Stainless steel or imported color steel sheet. 3. Bracket: SUS304-2B stainless steel or Corrosion-resist Colored powder coating steel. 4. Temperature insulation layer: Imported polyurethane 50-60mm thickness 5. This product is suitable to low latitude region or countries as Asian, Africa, , South America and so on. Vacuum tube 47-1500mm, 58-1800mm co-axial structure high borosilicate 3.3 glass vacuum tube 7 Inner tank material SUS304-2B Stainless Steel with thickness of 0.4mm Outer tank material Color powder coating steel / Stainless steel Frame material Galvanized steel plate with thickness of 1.5mm Capacity of water tank 90-324L, 40L/person for Max consumption Heat preservation layer high pressure automatic polyurethane foaming layer with thickness of 55mm Heat preservation 48-72 hours Hailstone resistance Dia≤25mm