Features:1.Compressor:Copeland with high efficiency, high-energy and flexible design ensure stable working and long lifetime2.Heat exchanger: Double-pipe heat interchanger enables high efficiency3.Constant hot water supply at 75°C without any electronic heating4.Electronic expansion valve: advanced technology and good system control5.Earth friendly and high efficiency air to water energy source : no pollutant when heating, high efficiency which can make EERto4.5Working Principle: