Quote Originally Posted by PhyllisStant View Post
If you want to heat an area by 10 degrees it doesn't matter the power rating or type of heater - it will always cost the same in electricity usage. That's assuming the heaters have the same efficiency (they are all about 98-99% efficient).

The only things you need to consider regarding what type/ power to buy is how quickly do you want to heat the room and how much do you want to pay for a heater. Source: My mate did his Physics doctorate on heating systems and I asked him!
from the links above, Oil filled takes longer to heat

Im a firm believer of a small amount of heat ( low W heater ) on for longer, but having said that, 12 hours of a 500 W heater will cost the same as a 1000 W on for 6 hours, so it doesnt make sense what I believe in