With up to 4500W, this is our most popular large wall heater, used in both residential and commercial applications. Standard with a 3-position Heat/Fan/Off Switch and a fan delay to help dissipate heat from the high-mass steel plate fin elements thereby prolonging heater life and increasing energy efficiency. Motor Type: Heavy-duty, cast iron, unit bearing, permanently lubricated with 20cc oil reservoir, 1440 RPM. Enclosed impedance protected with intake air cooling motor for increased bearing life. Patented Smart Limit Protection: Disconnects Elements And Motor In The Event Normal Operating Temperatures Are Exceeded. The high quality built-in thermostat has degrees on the label so temperature selection is easy and accurate.