Coffee and Espresso Machines Espresso machines use pressure to push water into finely roasted and tamped beans. They produce a rich and tasty brew. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to achieve optimal extraction. Beware of brands that advertise https://www.coffeee.uk/products/philips-black-espresso-machine-with-4-coffee-settings