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How can I fix the knob on my space heater?

I have a Pelonis stand-up electrical space heater (looks like a radiator). The power knob with settings of Off, Low, Medium, and High, is not working. The plastic knob seems to have broken from whatever it was connected to, so now the heater won’t turn on. Can anyone give any advice? Should I try to pull the knob out? I was unable to push the knob back into place. I cannot buy a new heater and it is still winter. What can I do?
This is in my BEDROOM. So in response to one answer, filling the tub will do NOTHING.
Also, I live in eastern PA, so it’s not cold enough to freeze to death. It’s just too cold for comfort or sleep.