Non-pressured solar water heater system
1) Inner tank: stainless steel SUS304---0.5mm
2) Vacuum tube:QB-AL-N/AL-47-1500/58-1800
3) Outer tank: painted steel-0.4mm/aluminum-zinc coated steel-0.45mm/stainless steel SUS 201/ 304
4) insulation: polyurethane 50mm/55mm
5) Frame: coated galvanized steel-1.5mm/stainless steel SUS 201-1.5mm
6) Reflector: aluminum component/stainless steel

Advantage:
1) The material of the outer tank is Galvanized Steel. The material of the inner tank is SUS304 stainless steel.
2) The life of the vacuum tubes is 15 years.
3) Stable and reliable performance, well resistance.
4) Temperature when exposed to sun without water: 250degree, 2.5 hours to boiling point if using single tube.
5) It resists 25mm hail.
6) Heat preservation: 72 hours.
7) optional accessories: assistant tank, electric heater
8) 5 years warranty.