A professional coffee machine, comprising: - a supporting frame, - a boiler mounted to said supporting frame and comprising a tank which is supplied with water and which is provided with means for heating it, - at least one preheater for the preparation of a coffee infusion, comprising a first heat exchanger which is associated with said boiler so that the water contained and heated therein heats in turns, by heat exchange, the supply water which crosses said first exchanger to a first temperature T 1, said first temperature T 1 being lowerly close or substantially equal to a second temperature T 2 which corresponds to the optimal one provided for the preparation of a specific coffee infusion, - a dispensing unit of the coffee infusion, provided with its own thermo-controlled heating element which is configured to bring the water released from said preheater to said second temperature T 2 if said first temperature T 1 is lower than said second temperature T 2, - a dispenser of hot water for the preparation of the tea infusion, connected to a second heat exchanger of said heater by means of a conduit provided with an intercepting member of the hot water flow heated to a third temperature T 3, and characterized in that it comprises: - thermal insulating means for mechanically constraining said dispensing unit to said frame of the coffee machine, - a heater for the preparation of a tea infusion or the like, comprising said second heat exchanger associated with said boiler so that the water contained and heated in said boiler heats in turns, by heat exchange, the supply water which crosses said second exchanger up to said third temperature T3, said third temperature T3 corresponding to the optimal one provided for the preparation of a tea infusion or the like. - a supporting frame, - a boiler mounted to said supporting frame and comprising a tank which is supplied with water and which is provided with means for heating it, - at least one preheater for the preparation of a coffee infusion, comprising a first heat exchanger which is associated with said boiler so that the water contained and heated therein heats in turns, by heat exchange, the supply water which crosses said first exchanger to a first temperature T 1, said first temperature T 1 being lowerly close or substantially equal to a second temperature T 2 which corresponds to the optimal one provided for the preparation of a specific coffee infusion, - a dispensing unit of the coffee infusion, provided with its own thermo-controlled heating element which is configured to bring the water released from said preheater to said second temperature T 2 if said first temperature T 1 is lower than said second temperature T 2, - a dispenser of hot water for the preparation of the tea infusion, connected to a second heat exchanger of said heater by means of a conduit provided with an intercepting member of the hot water flow heated to a third temperature T 3, - thermal insulating means for mechanically constraining said dispensing unit to said frame of the coffee machine, - a heater for the preparation of a tea infusion or the like, comprising said second heat exchanger associated with said boiler so that the water contained and heated in said boiler heats in turns, by heat exchange, the supply water which crosses said second exchanger up to said third temperature T3, said third temperature T3 corresponding to the optimal one provided for the preparation of a tea infusion or the like.