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Buying an Espresso Coffee Machine Espresso machines heat water to near-boiling and then force it through tightly-packed ground coffee into portafilters under high pressure. They also supply steam for milk-based drinks. Most espresso makers include 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 to choose the right machine If you're thinking of purchasing an espresso
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