How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines make use of pressure to push water through coffee grounds. This method of brewing produces an even stronger drink than drip coffee. These machines require nine bars of pressure in order to extract the flavor from the ground. https://coffeee58635.blogdigy.com/15-up-and-coming-espresso-machine-bloggers-you-need-to-watch-44472693