Material and Major Element:
1. Inner water tank: SUS304-2B stainless steel / 0.4mm thick
2. Outer water tank: Stainless steel / 0.4mm thick
3. Bracket: Stainless steel 1.2mm thick
4. Solar vacuum tube: A) Size: 47 x 1, 500mm AL/N/AL
Vacuum tubes b) Qty: 15 /18 / 20 / 24 / 30 /36 PCS c) Type: Three Target Tube
5. Temperature insulation layer: 50mm- 55mm imported
Polyurethane, keep same temperature and high pressure foam
6. Tank diameter: 420 mm
7. Warranty: Offer 5 years' international responsibility for free repairing or exchange due to original