Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They create a rich and delicious brew. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to achieve optimal extraction. Beware of https://www.coffeee.uk/products/compact-espresso-and-cappuccino-machine-with-milk-frother