Yancheng Sangli Solar Energy Co., Ltd. is one of the specialized producing bases with the biggest scales for the utilization of the heat of solar energy series products in China, the Company has co-operated with Qinghua University twice since 1992, to develop and produce All Glass Evacuated Solar Collector Tubes and Solar Water Heater System. At present, the annual production capacity has reached 100,000 sets of solar water heaters, nearly 2 million all-glass solar vacuum collector tubes  and over 80,000 sets of Adjustable Thin-typed Cast-iron Solar Cookers. The company strictly complies with the ISO9001 standard.