How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines push water through the coffee grounds using pressure. This type of brewing results in a stronger beverage than drip coffee. These machines require 9 bars of pressure to extract flavor from the grounds. Espresso machines are available in https://wwwcoffeeeuk19160.livebloggs.com/35997101/say-yes-to-these-5-coffee-machines-espresso-tips