They buy radiators as "Heavy Melting Steel" (HMS) or pure cast iron.
Places like Heritage Cast Iron Radiators or Wagner Salvage in Philadelphia maintain huge inventories for contractors and homeowners rehabbing historic buildings. who buys cast iron radiators
Firms like Salvage Doctor (UK) and Ironworks Radiators (Canada) buy old units to strip, pressure test, and repaint for resale. They buy radiators as "Heavy Melting Steel" (HMS)