How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines force water through the coffee grounds with pressure. This type of brewing makes stronger beverages than drip coffee. These machines require 9 bars of pressure to extract flavor from the grounds. There are three kinds of espresso machines. https://coffeeeuk52978.tokka-blog.com/30006738/why-coffee-machines-espresso-should-be-your-next-big-obsession