Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They create a rich, delicious cup. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars in order to ensure the highest extraction. Beware of https://www.coffeee.uk/products/breville-barista-express-espresso-machine-stainless-steel