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 also provide steam for milk-based drinks. Most espresso makers come with programmable settings for drink sizes and strengths. They may also feature proportional-integral-derivative (PID) temperature https://coffeee55619.blogkoo.com/what-to-focus-on-when-improving-best-ground-coffee-for-espresso-machine-49480182