There is provided a heat diffuser (100) for use with an electrically-operated aerosol-generating device (300), the heat diffuser (100) being configured to be removably couplable to the aerosol-generating device (300). The heat diffuser (100) includes a non-combustible porous body (110) for absorbing heat from an electric heating element (330). The porous body (110) is thermally conductive such that, in use, air drawn through the porous body (110) is heated by the heat absorbed by the porous body (110). A heated aerosol-generating article (400) and an aerosol-generating system, both comprising the heat diffuser (100), are also provided.
