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Buying an Espresso Coffee Machine Espresso machines heat the water to a temperature near boiling. They then push it under high pressure through tightly packed ground coffee portafilters. They also supply steam for drinks made from milk. Most espresso machines have programmable settings that can 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 boile
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