Buying an Espresso Coffee Machine Espresso machines heat water until near boiling and then force it through tightly-packed ground coffee in portafilter baskets under pressure. They can also be used to make milk-based drinks. The majority of espresso makers have adjustable settings for the size of the drink and strengths. https://coffeee85867.theisblog.com/30046542/its-history-of-coffee-espresso-machine