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