According to the owner's manual, the 120v version is protected by a 2a fuse, which means realistically it couldn't draw more than about 150w continuously without frequently blowing fuses.
So something's not quite right with the specs. I'm guessing the power numbers are max instantaneous values, which have nothing to do with electric bills and btu's. If you are still concerned, I would contact the manufacturer directly.
So something's not quite right with the specs. I'm guessing the power numbers are max instantaneous values, which have nothing to do with electric bills and btu's. If you are still concerned, I would contact the manufacturer directly.