Mike S. wrote:
We have a small unheated bathroom and have been using small electric
heaters to make the temperature comfortable when someone takes a shower
snip
The need is for the heater to get the bathroom warmed up _fast_, which
means it must blow a lot of air around the room within only a few minutes.
snip
Any suggestions?

If air-moving were the issue, a symptom would be an overheated region
in the
path of radiation or convection from the heater. Which you do not
mention.

Even 1500-watt heater (which does stress the electrical connections) is
only going
to dissipate 5100 BTU/hr. About half the output of a stovetop gas
burner.

Suggestions? Get used to it; start heater earlier; go to higher-output
220v hard-wired
heater; insulate, seal, and heat efficiently. Your pick.

HTH,
J