Next to the mallet is the other fundamental element of the forge, the oven, which serves to heat the pieces of iron, which, once they become malleable, are beaten and worked.

The fire is continually fed by an extraordinary and complex process that develops in the Tina de l'ora (literally, air container): the exploitation of the power of water that, channeled into an iron pipe, through a jump of about three meters, is dropped against a large granite boulder, inside a minicamera buried in the floor, near the discharge channel, producing in this way oxygen, transported inside the oven through a metal duct.