An electrically heated aerosol-generating device is provided, including a heating assembly configured to heat an aerosol-forming substrate to generate an inhalable aerosol, the assembly including a heater and a heater mount, the heater being blade-shaped, including an electrically insulating heater substrate, an electrically resistive heating element supported by the heater substrate, and a through-hole through a thickness of the heater, the heater being insertable into the aerosol-forming substrate and having a length of about 10 mm to about 60 mm, a width of about 2 mm to about 10 mm, and a thickness of about 0.2 mm to about 1 mm, the mount including a moldable material molded around a portion of the heater and extending through the through-hole to couple the heater to the mount so the mount provides structural support to the heater and is configured to allow the heater to be disposed within the device.
