Coffee and Espresso Machines Espresso machines utilize pressure in order to make water into finely ground and tamped beans. They make a rich and delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to get the most efficient extraction. Beware https://www.coffeee.uk/products/smeg-146875-coffee-machine-adjustable-temperature-milk-frother