Have you ever noticed cups sitting on top of an espresso machine in a coffee shop? You might think that it is simply convenient storage, but there is more to it. Within the guts of the machine is a boiler that brings the water up to temp and that boiler, like all boilers emit heat. The heat warms up the cups ensuring that the temperature of the drink you receive is near optimal.
One more reason why you espresso drink tastes better when you sit down and drink at at the cafe instead of taking it in an icky paper cup to drink in your car.
