How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines push water through the coffee grounds with pressure. This type of brewing creates an even stronger drink than drip coffee. These machines require 9 bar of pressure to extract flavor from the coffee grounds. Espresso machines are available https://wwwcoffeeeuk73686.bloggazza.com/29133261/10-key-factors-on-espresso-machine-you-didn-t-learn-in-school