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 at a minimum pressure of 9 bars to get the most efficient extraction. Beware https://wwwcoffeeeuk08319.sharebyblog.com/29675294/15-startling-facts-about-coffee-machines-espresso-you-ve-never-known