Inner and outside water tank shell: colored steel sheet, welded by argon arc
Heat insulation of water tanks: polyurethane foam with 55mm thickness
Silicon rings to connect and seal them
Whole glass vacuum tubes: super hard borax and silica glass
Tubes and supports are adjustable, power bearing is average, and can assure the vacuum tubes to use long time
Absorb rate: ≥93%,thermal radiation rate: ≤6%
Resists 25mm hail, using life can last 15 years
Water is pure and drinkable
Temperature when exposed to sun without water: 250°C, 2.5 hours to boiling if using single tube
If electrical appliances is used for aid heating, switch off the power supple before bathing to test the water temperature before using, in order to avoid scalding
