How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines push water through the coffee grounds using pressure. This type of brewing makes an even stronger drink than drip coffee. These machines require 9 bar of pressure to extract flavor from the grounds. Espresso machines are available in https://wwwcoffeeeuk01964.win-blog.com/9831941/espresso-machine-explained-in-fewer-than-140-characters