How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines force water through the coffee grounds with pressure. This method of brewing produces more strength than drip coffee. These machines need 9 bars of pressure to extract flavor from the grounds. There are three primary types of espresso https://coffeee09972.yomoblog.com/36057050/10-meetups-on-espresso-machine-you-should-attend