The invention concerns an espresso coffeemaker having a removable water reservoir (4) connected to a main hydraulic circuit including a pump which sucks up water from the reservoir (4) and sends it into a heating unit and hence through the ground coffee contained in a filter-holder, said reservoir (4) being also connected to a return water hydraulic circuit exiting from the heating unit. The invention is characterized in that the device (28) connecting said reservoir (4) to said hydraulic circuits comprises means for expanding (49) the water jet returning through the hydraulic circuit to the reservoir and means for directing (44) said jet to a storage zone.