Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich and delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars to get the most efficient extraction. Beware of https://www.coffeee.uk/products/4-bar-espresso-latte-cappuccino-maker-stainless-steel