If that is one of the heaters without a blower, don't get rid of it! Even if you want to replace it with something modern others may want the parts or to fix it as a replacement in their camper. Not an easy item to find.
The old heaters did not have or need a blower so if boondock camping on
battery one does not have to worry about
battery running down and having no heat. Oh and they don't make any noise to disturb your sleep.