These devices produce a very strong coffee by steam. This coffee is much richer and thicker than the coffee made from coffee boiler and is a base for cappuccino. Like an electric kettle, having a high voltage in the device will cause water to boil faster. Working with this machine is incredibly easy. Freshly grinded coffee is used to make the espresso and gives you a whole fresh coffee. Some of these types of devices are completely automatic: Pour water in the water tank and the milk into the reservoir and pour the coffee beans into a container. Then simply press the button on the device. The machine grinde coffee beans, pour the coffee into the cup to serve.