Coffee and Espresso Machines Espresso machines use pressure to press water into finely crushed and tamped beans. They create a rich and flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to ensure the highest extraction. Beware of https://www.coffeee.uk/products/swan-retro-espresso-coffee-machine-grey-15-bars