A coffee machine for nautical and aeronautical applications including a pod-holding shell and a heat exchanger system, the heat exchanger system comprising: an elongated body provided with a casing, inside which a cylindrical chamber is formed, which internally houses a heating element, a helical space for water to be heated, a water inlet of the heat exchanger system and a water outlet of the heat exchanger system, the water outlet of the heat exchanger system being provided with a compressor connected to the pod-holding shell and configured to impart pressure to hot water output from the heat exchanger system; wherein the heat exchanger system is further provided with thermal switches and safety probes configured to respectively protect the system from overheating and allow adjustment of the water temperature and retaining screws configured to hold together all the parts of the heat exchanger system, characterised in that the heating element is provided centrally with a longitudinal cavity which houses a resistance, the heating element being provided on its outer surface with helical grooves which, together with the internal surface of the cylindrical chamber, form the helical space, the helical space being further defined by closing pieces that seal against passage of the water from between the grooves and the inner wall of the casing, in that the water inlet of the heat exchanger system is provided with a three way electrovalve having a water discharge outlet, which, when de-energized, is open towards the water discharge outlet so that the heat exchanger system remains full of water only for the time required for heating such a water, and in that the internal surface of the cylindrical chamber and the outer surface of the heating element are covered with a layer of non-stick material. an elongated body provided with a casing, inside which a cylindrical chamber is formed, which internally houses a heating element, a helical space for water to be heated, a water inlet of the heat exchanger system and a water outlet of the heat exchanger system, the water outlet of the heat exchanger system being provided with a compressor connected to the pod-holding shell and configured to impart pressure to hot water output from the heat exchanger system; wherein the heat exchanger system is further provided with thermal switches and safety probes configured to respectively protect the system from overheating and allow adjustment of the water temperature and retaining screws configured to hold together all the parts of the heat exchanger system, characterised in that the heating element is provided centrally with a longitudinal cavity which houses a resistance, the heating element being provided on its outer surface with helical grooves which, together with the internal surface of the cylindrical chamber, form the helical space, the helical space being further defined by closing pieces that seal against passage of the water from between the grooves and the inner wall of the casing, in that the water inlet of the heat exchanger system is provided with a three way electrovalve having a water discharge outlet, which, when de-energized, is open towards the water discharge outlet so that the heat exchanger system remains full of water only for the time required for heating such a water, and in that the internal surface of the cylindrical chamber and the outer surface of the heating element are covered with a layer of non-stick material.