We are solar water heater supplier locating in nanjing, China.  We have a team of engineers who are dedicate themselves to the development of solar energy. Main products are oval-shaped solar heating vacuum tubes. The oval-shaped inner vacuum tubes have much larger absorbing surface than present round ones. So the temperature from our tubes could reach to 100 degrees.  While the present round ones could only get to 65 degree at most.  As a manufacturer we could make different types of tubes according to your requirements.