Espresso coffee machine comprising: - a main boiler, configured for producing hot water and steam; - at least one dispensing group, configured for preparing coffee and physically and functionally independent from said main boiler; - a secondary boiler physically and hydraulically connected to each dispensing group, said secondary boiler being configured to keep the water for dispensing coffee at a predetermined temperature value checked by a temperature probe; - a main water inlet circuit for inletting water from the water supply network, hydraulically connected to the main boiler and to the secondary boiler of each dispensing group, said main water inlet circuit comprising at least one pump that applies a predetermined pressure value to the water; - an electronic control unit; and - a dispensing valve, which determines the start and the end of the distribution, letting the water pass from the secondary boiler of each dispensing group to a brewing chamber of said dispensing group, the espresso coffee machine being characterized in that it comprises: - an air inlet circuit, hydraulically connected to the brewing chamber of each dispensing group; - at least one compressor, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined pressure value into the brewing chamber of each dispensing group; and - at least one heating element, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined temperature value into the brewing chamber of each dispensing group. - a main boiler, configured for producing hot water and steam; - at least one dispensing group, configured for preparing coffee and physically and functionally independent from said main boiler; - a secondary boiler physically and hydraulically connected to each dispensing group, said secondary boiler being configured to keep the water for dispensing coffee at a predetermined temperature value checked by a temperature probe; - a main water inlet circuit for inletting water from the water supply network, hydraulically connected to the main boiler and to the secondary boiler of each dispensing group, said main water inlet circuit comprising at least one pump that applies a predetermined pressure value to the water; - an electronic control unit; and - a dispensing valve, which determines the start and the end of the distribution, letting the water pass from the secondary boiler of each dispensing group to a brewing chamber of said dispensing group, the espresso coffee machine being characterized in that it comprises: - an air inlet circuit, hydraulically connected to the brewing chamber of each dispensing group; - at least one compressor, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined pressure value into the brewing chamber of each dispensing group; and - at least one heating element, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined temperature value into the brewing chamber of each dispensing group. - an air inlet circuit, hydraulically connected to the brewing chamber of each dispensing group; - at least one compressor, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined pressure value into the brewing chamber of each dispensing group; and - at least one heating element, positioned on the air inlet circuit, electronically controlled by the electronic control unit and configured for injecting air at a predetermined temperature value into the brewing chamber of each dispensing group.