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Buying an Espresso Coffee Machine Espresso machines heat the water to close to boiling, and then force it under a high pressure through tightly packed ground coffee in portafilters. They can also be used to make milk-based drinks. Most espresso makers come with programmable settings for drink sizes 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 temperature. Sele
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