Coffee and Espresso Machines Espresso machines make use of pressure in order to press water into finely crushed and tamped beans. They make a rich, flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars in order to achieve optimal extraction. https://coffeee-uk72401.webbuzzfeed.com/30302509/pay-attention-watch-out-for-how-espresso-machine-is-taking-over-and-what-you-can-do-about-it