1. Whole glass vacuum tubes adopt super hard borax and silica glass;
2. Absorb rate: ≥93%, thermal radiation rate: ≤6%(100 degree).
3. Temperature when exposed to sun without water: 250 degree, 2.5hours to boiling if using single tube. 4. Resist 25mm hail, using life can last 20 years.

5.inner tank:SUS3042B with 0.31mm-0.6mm

6.Outer tank :Color steel or galvanized steel with 0.31mm-0.4mm

7.insulating layer: 3.8Kg/m³ polyurethane with 50-60mm

8.Frame:Aluminum alloy with 2 mm

9.Reflector:202 stainless steel with 0.21mm-0.31mm

Feature:
1. Inner and outside water tank shell all are welded by argon arc. Water is pure and drinkable.
2. Heat insulation of water tanks adopts polyurethane foam, thickness is 55mm

3. Silicon rings to connect and seal them.
4. The tubes and supports are adjustable, power bearing is average, and can assure the vacuum tubes to use long time.
5. If you use electrical appliances to aid heating, to switch off the power supple before bathing.
6. To test the water temperature before using, in order to avoid scalding.