Coffee and Espresso Machines Espresso machines use pressure to force water into finely ground and tamped beans. They produce a rich and delicious cup of coffee. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars to get the most efficient extraction. Beware https://www-coffeee-uk02119.pointblog.net/10-factors-to-know-about-espresso-machine-you-didn-t-learn-in-the-classroom-71404729