Buying an Espresso Coffee Machine Espresso machines heat the water to a temperature near boiling and then force it under high pressure through tightly packed ground coffee in portafilters. They can also be used to create milk-based drinks. Most espresso makers come with programmable settings for drink sizes and strengths. https://coffeeeuk79094.blogozz.com/29310437/20-myths-about-best-ground-coffee-for-espresso-machine-busted