Melting unit for melting down casting materials and method for producing molten material for castings

A melting apparatus for melting casting materials, comprising:

• a first furnace vessel configured for melting casting materials and for accommodating melt formed by melting;
• and
• a second furnace vessel located downstream of the first furnace vessel such that melt formed from casting materials in the first furnace vessel can be conducted into the second furnace vessel;
• wherein the second furnace vessel his configured for accommodating the melt which can be conducted from the first furnace vessel into the second furnace vessel and for increasing the temperature of the accommodated melt to the casting temperature for this melt.