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Buying an Espresso Coffee Machine Espresso machines heat water to near boiling and then force it under high pressure through tightly packed ground coffee into portafilters. They can also be used to make milk-based drinks. The majority of espresso machines can be programmed with 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 optimal brewing te
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