There is provided an electrically heated aerosol-generating device for use with a consumable cartridge comprising a storage portion containing an aerosol-forming substrate, the storage portion having a fluid permeable internal surface surrounding an open-ended passage extending through the cartridge. The device includes a housing having a cavity for receiving at least a portion of the cartridge and a heater assembly positioned in the cavity. The heater assembly includes an electrically conductive hollow shaft portion connected to the housing and an electric heater positioned along the hollow shaft portion and having at least one heating element for heating the aerosol forming substrate of a cartridge received in the cavity. The hollow shaft portion defines an airflow passage forming part of an airflow pathway through the device and is arranged to extend into the open-ended passage of a cartridge received in the cavity. The hollow shaft portion comprises a plurality of apertures and the at least one heating element of the electric heater is formed by one or more narrow regions of the hollow shaft portion between adjacent apertures.
