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. The majority of espresso machines are programmable settings to adjust the strength and size of the beverage. https://wwwcoffeeeuk73686.bloggazza.com/29158359/five-things-you-re-not-sure-about-about-coffee-espresso-machine