Buying an Espresso Coffee Machine Espresso machines heat water until near-boiling and then force it through tightly-packed ground coffee in portafilter baskets under pressure. They also provide steam for milk-based drinks. Most espresso makers include customizable settings for different sizes of drinks and strengths. They may also feature proportional-integral-derivative (PID) https://www-coffeee-uk55924.therainblog.com/29118894/the-ultimate-glossary-on-terms-about-best-ground-coffee-for-espresso-machine