Established in 1999, guangdong tongyi electrical appliance co., ltd. is located in guangzhou, a key city in southern china. our company specializes in the research, development, manufacturing and selling of energy-saving air to water heat pump, geothermal heat pump and water to water heat pump and new energy electric appliances for more than ten years. we perform strictly in accordance with iso9001 quality management system. our products have been authorized ccc certification, and also succe