... COP more than 5.5 Geothermal Source heat pump ,ground source heat pump,water to water heat pump ,brine to water heat pumpModel: GHP07,GHP07B,GHP09,GHP09B,GHP10,GHP10B ... differential pressure switchSoft starter 1 phase heat pumpON LINE SYSTEM is optionalDaily hot water pump: Wilo water pump is optionalElectric heater: 3KW ,6KW,9KW is ... your inquiry will be replied in 24 hours . Geothermal heat pump