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 portafilters. They also supply steam for drinks made from milk. Most espresso machines have programmable settings to adjust the strength and volume of the beverage. https://coffeee32356.tinyblogging.com/20-tips-to-help-you-be-more-efficient-at-best-ground-coffee-for-espresso-machine-73573161