Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich and tasty brew. Experts from the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to get the most efficient extraction. https://coffeee-uk12402.digiblogbox.com/55082956/guide-to-espresso-machine-the-intermediate-guide-on-espresso-machine