The vaporizing assembly (12b) for an aerosol generating system (10) comprises a liquid aerosol-forming substrate delivery device (30) for delivering liquid aerosol-forming substrate, and a heater assembly (40). The heater assembly comprises a heat resistive substrate (42) and an electric heater element (46). The liquid aerosol-forming substrate delivery device delivers liquid aerosol-forming substrate to at least a surface of the heat resistive substrate, wherein the heating element is isolated from the liquid aerosol-forming substrate. The invention is also directed to a method for generating an aerosol.
