Coffee and Espresso Machines Espresso machines use pressure in order to press water into finely crushed and tamped beans. They create a rich and delicious cup. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to get the most efficient extraction. Beware https://www.coffeee.uk/products/breville-cafe-roma-espresso-machine-brushed-stainless