Buying an Espresso Coffee Machine Espresso machines heat water to close to boiling, and then force it under high pressure through tightly packed ground coffee portafilters. They also provide steam for milk-based drinks. Most espresso makers include programmable settings for drink sizes and strengths. They may also feature proportional-integral-derivative (PID) https://coffeeeuk46927.onzeblog.com/29847768/12-companies-that-are-leading-the-way-in-best-ground-coffee-for-espresso-machine