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 high pressure. They also provide steam for milk-based drinks. The majority of espresso makers have adjustable settings for the size of the drink and strengths. https://coffeee00144.pages10.com/20-truths-about-best-ground-coffee-for-espresso-machine-busted-65443044