Buying an Espresso Coffee Machine Espresso machines heat water to a temperature near boiling and then force it under a high pressure through tightly packed ground coffee portafilters. They also provide steam for milk-based drinks. Most espresso machines have programmable settings to adjust the strength and size of the beverage. https://coffeee15094.blogrelation.com/35896155/10-quick-tips-to-coffee-espresso-machine