Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich and tasty brew. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to ensure the highest extraction. Beware https://www.coffeee.uk/products/smeg-50-s-retro-style-espresso-coffee-machine-cream