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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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