Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling. They then push it under a high pressure through tightly packed ground coffee into portafilters. They can also be used to create milk-based drinks. The majority of espresso makers have programmable settings for drink sizes and strengths. https://wwwcoffeeeuk03517.laowaiblog.com/29178718/what-to-focus-on-when-improving-best-ground-coffee-for-espresso-machine