Coffee and Espresso Machines Espresso machines use pressure in order to force water into finely ground and tamped beans. They produce a rich and flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to ensure the highest extraction. Beware of https://www.coffeee.uk/products/compact-red-illy-coffee-maker-machine-y3-3