Buying an Espresso Coffee Machine Espresso machines heat water until near-boiling and then force it through tightly-packed ground coffee into portafilters under pressure. They also provide steam for milk-based drinks. Most espresso makers come with customizable settings for different sizes of drinks and strengths. They may also feature proportional-integral-derivative (PID) https://coffeeeuk69684.blogs100.com/30262814/who-s-the-top-expert-in-the-world-on-coffee-espresso-machine