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