Buying an Espresso Coffee Machine Espresso machines heat water to near boiling and then force it through tightly packed ground coffee into portafilters under high pressure. They can also be used to create milk-based drinks. Most espresso makers come with adjustable settings for the size of the drink and strengths. https://wwwcoffeeeuk07003.theobloggers.com/35960878/why-no-one-cares-about-best-ground-coffee-for-espresso-machine