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.
Feature:
1. Beautiful appearance, steady structure, higher grade.
2. Inner and outside water tank shell all are welded by argon arc. Water is pure and drinkable.
3. Heat insulation of water tanks adopts polyurethane foam, thickness is 55mm
4. Silicon rings to connect and seal them.
5. The tubes and supports are adjustable, power bearing is average, and can assure the vacuum tubes to use long time.
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