Coffee And Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They make a rich, delicious brew. Good Housekeeping Institute experts recommend models that use 9 bars minimum to ensure the best extraction. Beware of manufacturers that boast more pressure than is needed. https://www.coffeee.uk/products/breville-bambino-espresso-machine-stainless-steel