Denison Olmsted of New Haven, Connecticut, appears to have been the earliest person to use the term 'radiator' to mean a heating appliance in an 1834 patent for a stove with a heat exchanger which then radiated heat. In the patent he wrote that his invention was a peculiar kind of apparatus, which I call a radiator.[1] The heating radiator was invented by Franz San Galli in 1855, a Prussian-born Russian businessman living in St. Petersburg.[2][3] In the late 1800s, companies, such as the American Radiator Company, promoted cast iron radiators over previous fabricated steel designs in order to lower costs and expand the market.