Fluid permeable heater assembly with cap

A cartridge for an aerosol-generating system, the cartridge comprising:

• a heater assembly including,
• a cap including,
• a hollow body having a first cap opening and a second cap opening, the first cap opening being opposite the second cap opening, the cap being integrally formed, and
• a holder including a holder opening, the holder configured to cover the first cap opening such that the holder opening superposes with at least a portion of the first cap opening;
• and
• a heating element, the heating element being a substantially flat electrically conductive and fluid permeable heating element, the heating element configured to vaporise an aerosol-forming substrate, and the heating element mounted on the holder such that the heating element extends across the first cap opening;
• a storage portion configured to store an aerosol-forming substrate;
• and
• a retainer configured to retain the heater assembly and configured to retain the heater assembly in contact with the storage portion.

An aerosol-generating system, comprising:

• a main unit;
• and
• a cartridge for an aerosol-generating system, the cartridge comprising:
• a heater assembly including,
• a cap including,
• a hollow body having a first cap opening and a second cap opening, the first cap opening being opposite the second cap opening, the cap being integrally formed, and
• a holder including a holder opening, the holder configured to cover the first cap opening such that the holder opening superposes with at least a portion of the first cap opening;
• and
• a heating element, the heating element being a substantially flat electrically conductive and fluid permeable heating element, the heating element configured to vaporise an aerosol-forming substrate, and the heating element mounted on the holder such that the heating element extends across the first cap opening;
• a storage portion configured to store an aerosol-forming substrate;
• and
• a retainer configured to retain the heater assembly and configured to retain the heater assembly in contact with the storage portion, the cartridge being removably coupled to the main unit.