1.3 target coating technique allows longer service life, heating absorption quickly and better heat insulation for the vacuum tubes.    
2.1 target coating just have aluminum single material film with total 6-7 layers.
3. Inner water tank adopts SUS 304 food grade stainless steel and outer tank can be stainless steel/color steel/galvanized steel with welding technique by argon arc.
4. Heat insulation of water tanks adopts polyurethane foam, thickness of 50-60MM
5. Silicon rings to connect and seal inner and outer tank;
6. The tubes and frame angles are adjustable for your local latitude;
7. Force balanced can ensure the vacuum tubes with longer sercie life
8. Adopts the most common Twin-glass tube made of extremely strong boricilicate glasses