Coffee and Espresso Machines Espresso machines use pressure in order to make water into finely ground and tamped beans. They make a rich, delicious brew. Experts at the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars in order to achieve optimal extraction. Beware of https://www.coffeee.uk/products/smeg-146875-coffee-machine-adjustable-temperature-milk-frother