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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 portafilter baskets under high pressure. They also supply steam for drinks made from milk. Most espresso makers come with customizable settings for different sizes of drinks 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 the best
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