Profile: Sunrain Air Source Energy Co.,Ltd is a company which specializing in researching, manufacturing and marketing of renewable products. Our products include heat pump water heater, heating & cooling heat pump, swimming pool heat pump, EVI heat pump, inverter heat pump, and water tanks. Our internal coils of heat exchangers are efficient finned tubes with advanced technology. The fin design increases the heat exchange area and effectively improves the heat exchange efficiency. The whole copper pipe has no internal solder joint, with high heat exchange efficiency, low flow resistance and strong anti-pollution ability.