Non-pressure solar water heater The characteristic: 1 Inner tank : stainless steel SUS304-0.5mm 2 Vacuum tube : QB-AL-N/AL-58-1800 3 Out tank : painted steel-0.4mm,aluminum-zinc coated steel--0.45mm,stainless steel SUS304 4 Frame: coated galvanized steel sheet-1.5mm;stainless steel SUS430-1.5mm. 5 The material of insulation:polyurethane 50mm/60mm/65mm 6 The reflector:Aluminum component : Al 99.85% surface oxidation. G.W 71KG