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 high pressure. They also provide steam for drinks made from milk. Most espresso machines have programmable settings that can alter the strength and volume of the drink. https://coffeee60431.mybuzzblog.com/9380022/why-people-don-t-care-about-best-ground-coffee-for-espresso-machine