1.Solar+air+electric+tank all in one system 2.COP 5.4 3.Dc inverter 4.EEV&PHE use 5.Flexible ... tank.,air source heat pump, two plate heat exchange ,solar system connection, The system recovers energy from the ventilation ... air and solar heater The recovered energy is supplied to the hot ... unit Heat Pump All In One ( 5KW, Air +solar DC inverter heat pump )