Forgive me for thumping the tub yet again about fire safety. I promise to stop when people quit burning houses down and dying from unsafe practices.
Here is a link from the CPSC regarding space heaters.
Please lend your attention to their comments regarding CO detectors, and while you’re buying batteries for all the other holiday electronica, ensure that your smoke detectors are equally well powered, and tested. If they’re over 10 years old, replace them.
Make sure that you and your family will be around this time next year. Thanks 
Just adding on here… (we actually had a minor emergency up at work because of this yesterday) If you are going to use an extension cord with the space heater, use the biggest, thickest, heaviest-duty one you can get your hands on. If the connection feels hot when the heater is running, do not use that cord!
Thank you, liirogue. Improper use of flexible cords is an ongoing problem. They are not a substitute for building wiring.
A 14AWG building wire is rated at 15 amps, and the circuit breaker protects same. When a smaller gauge extension cord is used, the breaker is still looking at the same Inverse Time Element equation on which it was engineered and built.
In a commercial occupancy, it is unlikely that branch circuits will have lower than 12AWG which is rated at 20 amps. Small extension cords can melt their insulation before a circuit breaker will react.
Safe use of flexible cords=temporary+attended use. Otherwise, you’re looking for trouble.