Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They make a rich, delicious brew. Good Housekeeping Institute experts recommend models that brew at 9 bars minimum to ensure the best extraction. Beware of manufacturers that claim to use higher pressure https://www-coffeee-uk84602.blogdun.com/30343788/what-is-coffee-machines-espresso-and-why-are-we-dissing-it