Just got back from spending part of the weekend in Southwest Va not too far from where I live. Visited Black Dog Salvage, the guys on the TV show Salvage Dawgs. Actually went there for one reason. They had a radiator I have only ever seen in Dan's EDR book but never run across in all the years I have been in business. Well, after doing a pressure test on it to make sure it was OK I now own it. Of course the object will be to install it somewhere and sell it for a profit.
I had my EDR book with me when I was there and the owner saw it and asked about it. After looking it over he went to his computer and ordered one.
they do. However, they were "Pantry Radiators". They went in butler's pantry's and they would put mainly plates on them to warm them for dinner but food could also be placed there.
I think nowadays they could be put at a mudroom entrance for shoes or put folded towels on it. Who knows what idea someone could come up with. Like your seed idea.