Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They make a rich, tasty brew. Good Housekeeping Institute experts recommend models that use a minimum of 9 bars to ensure the best extraction. Beware of brands that advertise more pressure than https://www.coffeee.uk/products/amzchef-20-bar-espresso-coffee-machine-with-lcd-panel