How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines use pressure to force water through coffee grounds. This method of brewing produces stronger beverages than drip coffee. These machines need 9 bars of pressure to extract flavor from the grounds. There are three main kinds of espresso https://www.coffeee.uk/products/de-longhi-nespresso-gran-lattissima-en650-b-1400-w-black