Zhejiang Shuangfeng Boiler Manufacturing Co., Ltd. SFENG Group was founded in 1952 (former Wuyi Boiler Factory), specializing in “SFENG” and “ZXET” brand environmental friendly and energy-saving steam boilers, steam generators, hot water heaters, thermal oil heaters, pressure vessels, series of products, development, design, manufacturing, sales, installation, repair, transformation, service in one of the national high-tech enterprises.