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Buying an Espresso Coffee Machine Espresso machines heat water until close to boiling, and then force it through tightly-packed ground coffee into portafilters under pressure. They can also be used to create milk-based drinks. The majority of espresso machines can be programmed with settings to adjust the strength and 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
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