... Corrosion resistant4. Insulation layer: 50mm polyurethane foam5. Solar Water Heater Bracket: stainless steel SUS201, thickness: 1.4mm 6 ... : 100-360 liters7. Type: 12, 15, 18, 20, 24, 30, 36tubes8. Heat preservation: 72hoursSolar water heater warranty: 5 years ... CE, CCC, ISO, etc. DescripitionNon-pressurized solar water heaterinner tank materialSUS304-2B Food Class Stainless Steelouter tank ...