Coffee And Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They make a rich, delicious cup. Experts at the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to get the best extraction. Beware of https://www.coffeee.uk/products/philips-black-espresso-machine-with-4-coffee-settings