How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines use pressure to force water through coffee grounds. This type of brewing makes a stronger beverage than drip coffee. The machines require 9 bars of pressure to extract flavor from the coffee grounds. Espresso machines are available in https://www.coffeee.uk/products/de-longhi-pump-espresso-machine-1450w-1-4l-reflection-bronze