Buying an Espresso Coffee Machine Espresso machines heat water until close to boiling, and then force it through tightly-packed ground coffee in portafilter baskets under high pressure. They can also be used to create milk-based drinks. Most espresso makers come with customizable settings for different sizes of drinks and strengths. https://coffeee38978.blogsidea.com/36042486/twenty-myths-about-best-ground-coffee-for-espresso-machine-busted