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Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling, and then force it under pressure to pass through tightly packed ground coffee portafilters. They also provide steam for drinks made from milk. Most espresso makers include customizable settings for different sizes of drinks 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 temperat
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