Coffee and Espresso Machines Espresso machines use pressure in order to press water into finely crushed and tamped beans. They create a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to achieve optimal extraction. Beware of brands https://www.coffeee.uk/products/de-longhi-stilosa-coffee-machine-15-bar-pressure-grey