Coffee and Espresso Machines Espresso machines use pressure in order to push water into finely roasted and tamped beans. They create a rich and delicious brew. Good Housekeeping Institute experts recommend models that use 9 bars or less to ensure the best extraction. Beware of brands that advertise more pressure https://www.coffeee.uk/products/veaton-super-automatic-espresso-coffee-machine-19-bar