1. Using solar energy first and the electric energy or natural gas as the auxiliary energy. Supply the hot water at anytime.

2. The water or other workig fluid, drived by pump, goes through the all metal pipeline and takes away the absorbed heat by the glass tube. So the system can supply higher temperature water, and can act as heat-resource combinated with refrigerator.

3. Evacuated U-tube Boiler: Suit the users in colder area annualy use. Also suit for request large volume water, higher temperature water or using other conductor fluid in system.

4. Model can bear pressure: Water drived by pump goes through u-tube and gets heat from the glass-tube then fluid out of the copper tube of the model. It simplifys the system installation.

5. No water through the glass-tube, so there are no burst, frozen, limiting time of up water, etc. to the glass tube.

6. All components are connected by metal connector and there are no any danger hiden.