Home Espresso Machines A machine that makes espresso makes use of hot water under pressure to force through grounds of coffee. Once you've mastered the perfect conditions for brewing, it's hard to go back. The most efficient machines have reservoirs or a plumbed connection to a constant source of water. https://www-coffeee-uk22418.activosblog.com/29150135/the-10-most-scariest-things-about-best-espresso-machine