Expobar Ruggero Multi Boiler Group 4 Coffee Maker These are the features that make the Ruggero a truly spectacular espresso machine. Available in 2, 3 or 4 groups. Automatic espresso coffee machine with electronic switchboard to control the coffee dosages volumetrically and manual override group switch per group. Automatic water filling, copper boiler with heat exchanger per group. These machines are custom made to order.