the lights in your average ceiling fan pull ~200 W, to give you some perspective.
from what you described earlier in this thread, i would not recommend a dimmer/rheostat for your environment as you had stated your temps fluctuate by a fairly large amount:
a rheostat works best in a room with stable temps, as a rheostat does not have a probe to read temps and adjust the electronic control like a thermostat does. i used a rheostat with my 100 W CHE and it worked really well, but my room has a stable temp (no more than a 3° swing).