Coffee and Espresso Machines Espresso machines use pressure to press water into finely crushed and tamped beans. They create a rich, delicious cup. Good Housekeeping Institute experts recommend models that use 9 bars or less to ensure an ideal extraction. Beware of manufacturers who tout more pressure than is necessary. https://wwwcoffeeeuk95674.shotblogs.com/11-faux-pas-you-re-actually-able-to-create-using-your-espresso-machine-43846057