I have a few of these oil-filled heaters in the bedrooms/office in order to avoid using the electric central heating. I don’t spend a lot of time in the kitchen or living room during winter so I usually set the main thermostat to a balmy 53 degrees.

These heaters have the usual three heat settings, up to a maximum of 1500 watts. What is the cheapest way to run these? I usually just leave it on the lowest setting and let it take a little longer to heat the room, setting the thermostat lower when I'm not using that room/not home. Has anyone computed the costs on these things? I assume there has be a difference...