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Buying an Espresso Coffee Machine Espresso machines heat water to near boiling. They then push it under a high pressure through tightly packed ground coffee in portafilters. They also provide steam for drinks made from milk. The majority of espresso makers have 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. How do you select a machine If you're considering purchasing an espresso make
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