When I started looking for ceramic heaters the first thing I noticed was that, unlike any other kind of heater (kerosene, propane, etc), the manufacturers were very canny about not listing the one thing that mattered...
BTUs
But as I noticed that EVERY single heater, big or small, listed the "1500 watts" on their packaging, I started to dig a little deeper. Hence the reason for this thread -- it isn't readily evident that all the heaters BTU output is the same.
I don't think it's any grand conspiracy or anything. No evil intent, except maybe to be canny where it comes to selling the more expensive (bigger) heaters.
It might even be argued that, as the other (bigger, more expensive) heaters actually have other components that, themselves, use some wattage, however little, they might actually have less of the allowable 1500 watts (top by area codes) availible to use toward the heating element, as it is running bigger or occilating fans.
It's not a big deal. Just an observation. With propane or kerosene heaters it is very obvious that you buy by the BTUs. I just thought it sort of misleading that the manufacturers of these (otherwise wonderful little energy saving devices) would purposely choose not to mention that they all had the same (or very nearly the same) BTU output.