Home Espresso Machines A machine that makes espresso makes use of hot water under pressure to push through grounds of coffee. Once you've mastered the perfect brewing conditions, it is hard to go back. The most efficient machines have reservoirs and/or a plumbed connection to a continuous supply of water. https://coffeee61905.bloggadores.com/29310767/what-is-it-that-makes-espresso-machine-so-famous