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Buying an Espresso Coffee Machine Espresso machines heat water until near-boiling and then force it through tightly packed ground coffee into portafilter baskets under pressure. They can also be used to make milk-based drinks. Most espresso makers include adjustable settings for the size of the drink and strengths. They may also feature proportional-integral-derivative (PID) temperature controls, which monitor and control on-off cycles to keep the boiler at