Coffee and Espresso Machines Espresso machines use pressure to force water into finely ground and tamped beans. They make a rich, tasty brew. Good Housekeeping Institute experts recommend models that brew at 9 bars or less to ensure a perfect extraction. Beware of companies that claim to offer more pressure https://coffeee70961.is-blog.com/36106200/there-s-a-good-and-bad-about-coffee-machines-espresso