Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling, and then force it through tightly-packed ground coffee into portafilter baskets under high pressure. They also supply steam for milk-based drinks. Most espresso machines have programmable settings to adjust the strength and the size of the beverage. https://coffeeeuk16314.isblog.net/11-faux-pas-that-are-actually-okay-to-make-with-your-best-ground-coffee-for-espresso-machine-47055356