This article argues that classical archaeologists have seriously underestimated the output of heat required to meld a large quantity of bronze and therefore have wrongly reconstructed the ancient casting process. The idea that sufficient metal for casting a bronze of monumental proportions could be heated in a crucible with a charcoal fire ventilated by bellows is not realistic. The following observations are based on solid foundry experience: Nigel Konstam, a bronze sculptor, for many years supervised the casting of monumental bronzes comparable in size to those from Riace. This article has been written by Herbert Hoffman drawing on Konstam’s notes.