Can you refill oil heater?
Keeping this in consideration, do oil filled heaters use a lot of electricity?
Oil heaters do take longer to heat a room but will provide you a more comfortable heating experience. Also the size of the room is a factor in cost efficiency. Oil filled units are the most efficient heaters. and often touted as 100% efficient, electric space heaters use a lot of electricity.
Hereof, can oil heaters explode?
Oil heaters have been known to explode when their thermal fuses fail to shut them off. This can cause fire, thick black smoke, unpleasant odors, oil on walls and other surfaces, and disfiguring scalding. Some companies offer oil heaters with a fan, to increase the air flow over the heater.
If there are working stable and especially if the thermostat is totally functional, there is no worry to leave them turned on overnight. Be sure to not leave anything flammable near or on the top of them.