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 . <EOS>