Turning the tabletop clockwise turns on The Hearth and functions as a temperature control. The rotating tabletop opens up the fins letting out more heat. Turning the tabletop counterclockwise turns down the temperature until it is off.
The Hearth is essentially a very large space heater. It pulls in air from hidden ducts on its underside, then heats the air with a ceramic filament—visually reminiscent of a fire. The air is then expelled through the fins fanning out 360 degrees.