Buying an Espresso Coffee Machine Espresso machines heat water until near-boiling and then force it through tightly packed ground coffee into portafilter baskets under high pressure. They also supply steam for milk-based drinks. Most espresso makers include programmable settings for drink sizes and strengths. They may also feature proportional-integral-derivative (PID) https://coffeeeuk47372.blogtov.com/10296527/a-trip-back-in-time-what-people-said-about-best-ground-coffee-for-espresso-machine-20-years-ago