Traditional espresso machines give you control over the entire espresso coffee brewing process: dosing, tamping, actioning the manual lever to pressure the water through the coffee and of course, timing each of these operations. The user still controls the beginning and the end of the brewing process, but the machine develops the water pressure.
Traditional espresso coffee machines feature a heat-exchanger boiler with two thermostats and a switch knob, which allows the operator to control coffee extraction and steaming and higher end traditional espresso machines also include secondary heating elements inside the boiler which automatically reduce the waiting times.