Buying an Espresso Coffee Machine Espresso machines heat water to near boiling and then force it through tightly-packed ground coffee in portafilter baskets under pressure. They also supply 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) https://www-coffeee-uk04163.blogpayz.com/29903797/three-greatest-moments-in-best-ground-coffee-for-espresso-machine-history