How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines use pressure to force water through coffee grounds. This method of brewing creates more strength than drip coffee. These machines require nine bars of pressure in order to extract the flavor from the ground. Espresso machines are available https://coffeee32356.tinyblogging.com/from-around-the-web-from-the-web-20-awesome-infographics-about-espresso-machine-73497708