Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They make a rich, delicious cup. Experts from the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to achieve optimal extraction. Beware of brands https://www.coffeee.uk/products/smeg-146875-coffee-machine-adjustable-temperature-milk-frother