How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines push water through the coffee grounds via pressure. This method of brewing produces an even stronger drink than drip coffee. These machines require 9 bars of pressure to extract flavor from the coffee grounds. Espresso machines are available https://www.coffeee.uk/products/salter-ek4369-caffe-barista-pro-espressokocher-15-bar