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 supply 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-uk76523.p2blogs.com/29186743/the-ultimate-glossary-of-terms-about-best-ground-coffee-for-espresso-machine