Buying an Espresso Coffee Machine Espresso machines heat the water to close to boiling. They then push it under a high pressure through tightly packed ground coffee portafilters. They can also be used to make milk-based drinks. The majority of espresso makers have programmable settings for drink sizes and strengths. https://coffeee77535.newsbloger.com/30345903/20-myths-about-best-ground-coffee-for-espresso-machine-busted