High-efficiency furnace

An installation for melting a composition of raw materials, suitable for obtaining a glass product including a glass wool, textile glass yarns and/or flat glass, which comprises a melting chamber equipped with at least one submerged burner, wherein the melting chamber is defined by side walls made of refractory material in accordance with the ISO/R836 or AFNOR NF B 40-001 standards, the refractory material having a pyroscopic resistance equivalent to at least 1500° C., and a bare metal bottom to which said at least one submerged burner is attached and which is traversed by a network of pipes adapted for the circulation of a cooling fluid,

• wherein said bare metal bottom is removably attached to said side walls,
• wherein said bare metal bottom is adapted to be traversed by the at least one submerged burner, which is removably attached to the bare metal bottom, and
• wherein said bare metal bottom includes a circumferential metal portion arranged in the side walls made of refractory material and a central metal portion that is removably positioned against the circumferential metal portion, wherein the central metal portion is positioned against the circumferential metal portion when the bare metal bottom is attached to the side walls and the central metal portion is separated from the circumferential metal portion when the bare metal bottom is detached from the side walls.