Aerosol-generating device having multi-layer insulation

An aerosol-generating device, comprising:

• an outer housing;
• a heater configured to heat an aerosol-forming substrate;
• a plurality of layers of thermal insulation arranged around at least a part of the heater, wherein the plurality of layers of thermal insulation comprises:
• a first thermal insulation layer,
• a second thermal insulation layer,
• a radiation reflector layer being arranged between the first and the second thermal insulation layers,
• a first heat spreader layer arranged between the outer housing and the second thermal insulation layer, wherein the first heat spreader layer is anisotropic and has a thermal conductivity in directions substantially parallel to the heat spreader layer of at least 700 W/m·K, and
• a second heat spreader layer comprising the outer housing of the aerosol-generating device, and
• wherein the heater is a tubular heater comprising open longitudinally opposing ends and an internal space arranged to receive at least a portion of an aerosol-generating article;
• and
• a barrier for separating one or more of the plurality of layers of thermal insulation from an airflow pathway for conveying aerosol to a user.