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Buying an Espresso Coffee Machine Espresso machines heat the water to close to boiling and then force it under a high pressure through tightly packed ground coffee in portafilters. They also provide steam for milk-based drinks. The majority of espresso makers have adjustable settings for the size of the drink and strengths. They may also feature proportional-integral-derivative (PID) temperature controls, which monitor and control on-off cycles to keep the boiler at an optimal brewing temp