Pre & early 20th century Cast Iron Ornate Home Radiators How Much?

Hi I have 4 Ornate Home Radiators.Not sure what there worth. They were made by the American Ratiator Company who were Around in 1895 - 1914 and then Mergerd with another company and the name changed so there all between 1895 - 1914. They are very Pretty and Very Heavy and i mean looks are decieving.If You have a good idea then please reply on How much they could go for.Thank you