Coffee And Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They produce a rich, delicious brew. Good Housekeeping Institute experts recommend models that brew at 9 bars minimum to ensure the best extraction. Beware of companies who claim they use more pressure https://www.coffeee.uk/products/smeg-ecf01whuk-espresso-coffee-machine-retro-style-white