La Marzocco KB9 three groups: The new group's locking mechanism allows the barista to insert the coffee filter easily and directly, without needing to fully lever. Lifting the coffee filter handle engages the locking mechanism, and the group automatically closes when the pump is engaged. Equipped with two steam wands and stainless steel steam wands. Steam boiler capacity 11 liters and coffee boilers capacity 1.3 liters each. Automatic steam flow releases a burst of steam to purge the brewing path, followed by a flow of hot water, keeping the group clean. Separate boilers optimize the espresso brewing process and steam production process. The integrated precision scales in the portafilter improve beverage consistency by stopping extraction based on mass. The PID (for both coffee and steam) allows you to electronically control the temperature of both the coffee and steam boiler. The brewing water is preheated before entering the boiler to increase temperature stability. A digital display makes intuitive programming easy to adjust machine parameters. Thanks to the intuitive display programming, it is easy to adjust the machine parameters.