Coffee and Espresso Machines Espresso machines use pressure to push water into finely roasted and tamped beans. They make a rich, delicious cup. Good Housekeeping Institute experts recommend models that brew at 9 bars or less to ensure the best extraction. Beware of manufacturers that claim to use more pressure https://www.coffeee.uk/products/gaggia-ri8423-espresso-machine-freestanding-manual-white