One of the few truly BRitish things I didn't sell off when I returned to the states was a 220V GE hair dryer, with the bonnet and long hose connecting the hot air bits with the bonnet.

When I relocated again to the NE of the US, I found that the bonnet end of the hose could be stuck into the bottom of the bed, under the covers, the dryer turned on, and the bed warmed up a treat!

I'm sure GE never intended or even thought that folks might try this, but the difference in output running on 110V insured that the dryer would never overheat and set the bed on fire.

Dave