How Does Machine Espresso Work? The machine espresso uses precision pressure, and a filter technology that is awe-inspiring to make the coffee you love. How exactly does it work? Espresso is created by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee. https://www.coffeee.uk/products/cozeemax-20bar-espresso-machine-with-milk-frother