Coffee And Espresso Machines Espresso machines make use of pressure in order to press water into finely crushed and tamped beans. They produce a rich, delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars to achieve optimal extraction. Beware of https://www.coffeee.uk/products/philips-black-espresso-machine-with-4-coffee-settings