RunningMan: The only argument I see for differences in efficency from the various resistive heaters would be ones that glow are emitting some of that energy as light rather than heat,
Nope, just a radiant heater that gets red hot obviously emits a small amount of energy as light, but the amount is absolutely trivial. It was aimed at the advertising claiming one resistive heater was more efficient than another, bit they all of course convert (essentially) 100% of the energy used to heat.
Not exactly like for like comparing my Auckland home office to a Dunedin student flat bedroom but... I have a small 1000W 5 fin oil column heater in my office and it was chilly this morning in Auckland so switched it on rather than heating up the whole house with the central heating, set the low/med/high switch to high and the room jumped from 16 degrees to 20 in 15 min. I now have it set on the 'low' position and it's holding the temp there. Pretty good for a tiny heater.
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