Coffee and Espresso Machines Espresso machines utilize pressure to push water into finely roasted and tamped beans. They create a rich, delicious cup. Experts at the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars in order to ensure the highest extraction. Beware of manufacturers https://www.coffeee.uk/products/compact-espresso-and-cappuccino-machine-with-milk-frother