1) Inner tank of the solar water heater shell is made of SUS304-2B food grade stainless steel plates, and outer tank shell is made of color steel plates, welded by argon arc.Water is pure and healthy. 2) Heat insulation of solar water heater tanks adopts polyurethane foam and the thickness is 55mm-65mm. 3) Silicon rings to connect and seal them. 4) The tubes and supports are adjustable.The life of the vacuum tubes is 5 years. 5) Whole glass vacuum tubes adopt super hard borax and silica glass. ¢58×1800mm×36 6) Supporters are made of High strength galvanized sheet, electrostatic pensu processing, so it is better anti-corrosive. And there are have red、rose and blue three colors to select. 7) Absorption rate:=93%, thermal radiation rate:=6%. 8) It resists 25mm hail and the using life of the whole system can last for 15 years. 9) Temperature when exposed to sun without water:250degree, 2.5 hours to boiling point if using single tube. Delivery Way - Date Of Delivery: 10-30 days