Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich and tasty brew. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to get the most efficient extraction. Beware of https://www-coffeee-uk81117.blog-ezine.com/29877051/a-guide-to-coffee-machines-espresso-from-beginning-to-end