Coffee and Espresso Machines Espresso machines utilize pressure to push water into finely roasted and tamped beans. They create a rich and flavorful brew. Good Housekeeping Institute experts recommend models that brew at a minimum of 9 bars to ensure a perfect extraction. Beware of brands that advertise more pressure https://www.coffeee.uk/products/gaggia-deluxe-coffee-machine-1850-w-15-bar