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Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling, and then force it through tightly packed ground coffee in portafilter baskets under pressure. They can also be used to create milk-based drinks. The majority of espresso machines are programmable settings that allow you to alter the strength and the size of the drink. They may also feature proportional-integral-derivative (PID) temperature controls, which monitor and control on-off cycles to keep the boiler at an o