A vessel for forming and/or containing a glass melt, comprising a first side wall, a second side wall, and a bottom wall, wherein: each of the first side wall and the second side wall comprises: a non-electrode portion having a thickness TH1 and comprising a front non-electrode surface facing the glass melt having a height HT1 and a width WT1, a rear non-electrode surface, and a first refractory material; and at least one electrode having a thickness TH2 and comprising a front electrode surface facing the glass melt having a height HT2 and a width WT2, a rear electrode portion comprising a rear electrode surface, and a second refractory material different from the first refractory material; 0.01 ⩽ HT 2 / HT 1 < 1.00; the at least one electrode is embedded inside the non-electrode portion; the at least one electrode and the non-electrode portion form a continuous wall; and an electrode-pushing mechanism adapted for pushing the at least one electrode to move inwards toward the center of the furnace relative to the non-electrode portion wherein, the at least one electrode comprises a stack of multiple blocks of the electrode material to form a continuous, monolithic electrode body and wherein the multiple blocks of the electrode material form at least two segments, each connected to a separate and independent electrode-pushing mechanism adapted for pushing the segment to move inwards toward the center of the furnace independently and separately. each of the first side wall and the second side wall comprises: a non-electrode portion having a thickness TH1 and comprising a front non-electrode surface facing the glass melt having a height HT1 and a width WT1, a rear non-electrode surface, and a first refractory material; and at least one electrode having a thickness TH2 and comprising a front electrode surface facing the glass melt having a height HT2 and a width WT2, a rear electrode portion comprising a rear electrode surface, and a second refractory material different from the first refractory material; 0.01 ⩽ HT 2 / HT 1 < 1.00; a non-electrode portion having a thickness TH1 and comprising a front non-electrode surface facing the glass melt having a height HT1 and a width WT1, a rear non-electrode surface, and a first refractory material; and at least one electrode having a thickness TH2 and comprising a front electrode surface facing the glass melt having a height HT2 and a width WT2, a rear electrode portion comprising a rear electrode surface, and a second refractory material different from the first refractory material; 0.01 ⩽ HT 2 / HT 1 < 1.00; the at least one electrode is embedded inside the non-electrode portion; the at least one electrode and the non-electrode portion form a continuous wall; and an electrode-pushing mechanism adapted for pushing the at least one electrode to move inwards toward the center of the furnace relative to the non-electrode portion wherein, the at least one electrode comprises a stack of multiple blocks of the electrode material to form a continuous, monolithic electrode body and wherein the multiple blocks of the electrode material form at least two segments, each connected to a separate and independent electrode-pushing mechanism adapted for pushing the segment to move inwards toward the center of the furnace independently and separately.