The Smart Heat Sweep Heater (Black Marble Veneer) (10"h x 8"w x 9"d) Color: Black Marble Veneer Size: 10"h x 8"w x 9"d Raises the temperature of an average size room 14 degrees F in just 30 minutes. Will automatically reduce heat output and synchronize the fan speed to maintain comfort level. Smart Thermaflo technology is energy efficient and is ideal wherever zone heating is required.