Coffee and Espresso Machines Espresso machines make use of pressure in order to force water into finely ground and tamped beans. They create a rich, tasty brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars in order to achieve optimal extraction. https://www.coffeee.uk/products/espressoworks-barista-bundle-espresso-maker-with-grinder-cups