how much electricity does the EdenPURE™ Quartz Infrared Portable Heater use?

Question

my grandmother needs something to help with her oil cost, and doesn't want her light bill to go up with this.

Answer 1

Electric heat typically costs more per BTU than oil or other sources of heat.
Adding electric heat to supplement heat in a small area may be worthwhile, but would be counter productive for the whole house.