We removed an old wall heater from our bathroom. It was hooked to the breaker box with a "double switch". Does that mean it is a 220 or could it be a 110 circuit? Can I use a new 110 wall heater on a 220 circuit? We can't find a licensed electrician who will work on our 105 yr. old house.
If by double switch you mean a breaker that has two handles and takes up two spaces, then this is a 220V heater. You may be able to use a 110 heater there, but some rewiring will have to be done.