How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines force water through the coffee grounds by using pressure. This type of brewing produces a stronger drink than drip coffee. The machines require nine bars of pressure in order to extract the flavor from the ground. Espresso machines https://wwwcoffeeeuk83610.blogsumer.com/29333900/this-is-the-history-of-coffee-machines-espresso-in-10-milestones