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Buying an Espresso Coffee Machine Espresso machines heat water to near-boiling and then force it through tightly-packed ground coffee in portafilter baskets under high pressure. They can also be used to create milk-based drinks. The majority of espresso machines are programmable settings to adjust the strength and the size of the beverage. 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 tempe