What's the control volume and how are you defining "efficiency"? If the heater unit itself is the control volume and if the efficiency is defined as the heat output of the device (i.e. the heater) divided by the energy supplied from the electrical outlet, then the efficiency will not be 100% due to line losses between the heater connection and the outlet. But it will be close. A motor driven fan complicates the issue but certainly will make the entire process less efficient. The 2nd Law of Thermo says we can't even break even so I doubt that even a pure resistor is 100% efficent in coverting electrical power to heat but I am at a loss to explain the mechanism for the that loss. I'm an engineer not a physicist.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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