A quick cooling/heating system for beverages and the like contained within a closed vessel, for instance a can (1) incorporating a heat exchanger (6) communicating to the outside of the vessel through an inlet (7) and an outlet (8) an adapted to be run through by a cooling/heating fluid delivered by an outer supply source (18, 20, 21) to be connected to the vessel inlet (7). The system comprises a recovery device (19, 22, 23) of the cooling/heating fluid to be connected with the outlet (8) of the heat exchanger (6) of the vessel (1). The recovery device (19, 22, 23) feeds back the supply source (18, 20, 21), whereby the flow path of the cooling/heating fluid through the heat exchanger (6) of the vessel (1) is along a closed circuit.
