The Oscar features commercial grade components including a heavy duty brewing group made from marine quality brass and an incredibly efficient 2. 3 liter heat exchange boiler system. Many other home espresso machines use only one boiler which means that you have to wait for a short period of time before you can steam you milk after you brew your espresso. But why wait while your espresso goes cold when, unlike many other home espresso machines, the heat exchanger in the Oscar allows you to brew the espresso and steam milk at the same time. Plus, the 2. 3 liter water tank means that the Oscar doesn't need to be hooked up to a direct water line. Features: Adjustable 360° swivel steam wand, Volumetric dosing controls, Pull-out grounds drawer, 2. 3 liter water tank