Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They make a rich, delicious cup of coffee. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to achieve optimal extraction. Beware https://www-coffeee-uk53780.newbigblog.com/35749562/20-trailblazers-setting-the-standard-in-espresso-machine