Haining Oupairineng Solar Water Heater Co., Ltd specializes in research, production and sales of vacuum tube solar water heaters with advanced equipment, technologies and service centers. The uniform distribution and sales services have been offering support to global stores and agencies of ONOSI. ONOSI solar energy adopts advanced production technology, and is very strict with management of every segments in production - from material selection and production to outer packing of solar products. ONOSI has obtained ISO9001 quality system certification for the "Manufacture of solar water heaters."