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Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling, and then force it under high pressure through tightly packed ground coffee into portafilters. They can also be used to create milk-based drinks. Most espresso makers include 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 temperature. How do you choose a machine Do your research prior to purchasing an espre