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 can also be used to make milk-based drinks. Most espresso makers include programmable settings for drink sizes and strengths. They may also feature proportional-integral-derivative (PID) https://coffeeeuk20244.develop-blog.com/36170368/15-things-you-ve-never-known-about-coffee-espresso-machine