Buying an Espresso Coffee Machine Espresso machines heat water to near boiling. They then push it under pressure to pass through tightly packed ground coffee into portafilters. They can also be used to make milk-based drinks. Most espresso makers come with customizable settings for different sizes of drinks and strengths. https://coffeeeuk27628.ageeksblog.com/29127185/what-is-the-evolution-of-best-ground-coffee-for-espresso-machine