Located in Haining City,Zhejiang Province,China,Haining Xishiduo solar energy technology co.,ltd is specialized in research,manufacture and marketing for solar water heater.The company can produce rough tube,vacuum tube,frame and water tank,becoming one of the first companies which have the complete industry chain in the solar industry.Company's annual production of vacuum tubes and solar water heaters are 8 million and 300,000 units.