A breathing assembly for supplying gases to a patient, the breathing assembly comprising: a patient end connector configured to be connectable to an airway device; a chamber end connector configured to be connectable to a humidification chamber and comprising an inspiratory inlet for receiving humidified inspiratory gases from the humidification chamber; and a coaxial conduit assembly extending between the patient end connector and the chamber end connector and comprising inner and outer conduits defined by inner and outer conduit walls, respectively, the inner conduit wall arranged within the outer conduit wall so as to define a first flow passage along the coaxial conduit assembly within the inner conduit and a second flow passage along the coaxial conduit assembly between the inner conduit and outer conduit, wherein the breathing assembly is configured such that inspiratory gases are conveyed along the first flow passage and expiratory gases are conveyed along the second flow passage, in use, and wherein the outer conduit wall is at least partially formed from a water permeable material configured to allow water to flow therethrough, and characterised in that the breathing assembly comprises a heating arrangement configured and arranged to heat gases flowing along the coaxial conduit assembly; wherein the heating arrangement comprises a first heating member embedded within the inner conduit wall of the inner conduit, the first heating member configured to heat gases flowing along the first flow passage; and wherein the heating arrangement comprises a second heating member configured to heat gases flowing along the second flow passage, wherein the second heating element is either positioned in the second flow passage or is embedded within the outer conduit wall. a patient end connector configured to be connectable to an airway device; a chamber end connector configured to be connectable to a humidification chamber and comprising an inspiratory inlet for receiving humidified inspiratory gases from the humidification chamber; and a coaxial conduit assembly extending between the patient end connector and the chamber end connector and comprising inner and outer conduits defined by inner and outer conduit walls, respectively, the inner conduit wall arranged within the outer conduit wall so as to define a first flow passage along the coaxial conduit assembly within the inner conduit and a second flow passage along the coaxial conduit assembly between the inner conduit and outer conduit, wherein the breathing assembly is configured such that inspiratory gases are conveyed along the first flow passage and expiratory gases are conveyed along the second flow passage, in use, and wherein the outer conduit wall is at least partially formed from a water permeable material configured to allow water to flow therethrough, and characterised in that the breathing assembly comprises a heating arrangement configured and arranged to heat gases flowing along the coaxial conduit assembly; wherein the heating arrangement comprises a first heating member embedded within the inner conduit wall of the inner conduit, the first heating member configured to heat gases flowing along the first flow passage; and wherein the heating arrangement comprises a second heating member configured to heat gases flowing along the second flow passage, wherein the second heating element is either positioned in the second flow passage or is embedded within the outer conduit wall.