Coffee and Espresso Machines Espresso machines utilize pressure in order to make water into finely ground and tamped beans. They produce a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars in order to ensure the highest extraction. https://www-coffeee-uk91567.canariblogs.com/7-simple-tips-to-totally-refreshing-your-espresso-machine-45051093