Features of construcion：

1.Inner tank is 0.5mm thickness SUS304 stainless steel, outer tank is 0.5mm thickness color steel or zinc-coated material，welded by argon arc，water is pure and drinkable.

2.Inner tank is with copper coil（φ12mm）

3.Heat insulation of water tanks adopts polyurethane's celluar，thickness is 55mm.

4.Aluminum alloy （or stainless steel）supports are connected by bolts and nuts，firm and stable， easy to install.

5.Between vacuum tubes and inner water tank, we adopt silicon rings to connect and seal them.

6.The tubes and supports are adjustable, power bearing is average, and can assure the vacuum tubes to use long time.

The characteristic: 
1.The design of this type production is according with the international market,adopted copper coil as heat exchanger. And it is easy to installation and operation.
2. It can provide hot water with constant temperature; it is safe and more comfortable.
3. It can supply high quality hot water, and water can be heated rapidly.
4. It can produce more hot water than general types because it isn’t restricted by capacity of tank.
5. It can be used single or many cells as solar heat system