● Outer tank: Adopt colored steel, which is anti-corrosion and anti-oxidation. It appears to be gorgeous.
● Inner tank: Adopt food-grade SUS304-2B stainless steel plate. Adopt advanced automatic welding equipment and automatic self-melting electric arc welding technology. The weld surface is smooth, anti-corrosion and with longer life.
● Choose borosilicate 3.3 special hard glass vacuum tube, which can resist hail φ25mm attacks.
● Insulation: Usually 50mm-60mm. Foamed by imported integrated polyurethane machine, through constant temperature and aging treatment, the insulation is of uniform density, high rate of obturator, excellent insulation effect, which ensures high efficiency of long-term heat storage, anti-cold and anti-freeze.
● Frame: Adopt galvanized steel. The frame is of new design, high intensity, corrosion resistance, strong wind resistance and excellent heat efficiency..
● Sealing ring: Adopt non-toxic tasteless, high temperature resistance, anti-aging silicone rubber, which complies with health standards for bathing but does not contain any hazardous substances even after heated under high temperatures.

Technical data:
Inner material of the tank: SUS304-2B stainless steel, thickness: 0.4mm
Outer material of the tank: colored steel, thickness: 0.4mm.
Vacuum tube: glass vacuum tube, φ47mm×1500mm、φ58mm×1800mm
Number of vacuum tubes: 16/18/20/24/30
Insulation: 50mm-60mm polyurethane foam
Frame: stainless steel/ galvanized steel