An aerosol-generating device is provided, including: a storage portion to store an aerosol-forming substrate and having an outer housing and an internal passageway, the storage portion forming a reservoir for the substrate between the outer housing and the internal passageway; a vaporizer being at least partially inside the internal passageway; and a porous interface at least partially lining the internal passageway to convey the substrate from the storage portion towards the vaporizer, the device being electrically operated and the vaporizer including an electric heater to heat the substrate, the heater including first and second cylindrical electrical connection portions, and a cylindrical heating filament between the first and the second portions, the first and the second portions being in the form of hollow tubes, the cylindrical shape of the first and the second portions and the filament defining a cylindrical bore with an air flow route therethrough.