A refractory tile, which is intended, in a service position, to protect a wall of energy recovery tubes internally lining a combustion chamber of a furnace, preferably of a furnace for incinerating household waste or biomass, said tile having: - a face, called "hot face", which is intended, in said service position, to be exposed inside the furnace; - a face, called "cold face", opposite the hot face, defining: - a groove extending over the entire length of the tile and intended, in said service position, to receive one of said tubes; and - a fastening receptacle configured to receive, in said service position, an anchor, or "retaining member", so as to immobilize the tile with respect to said tube, the tile having, in a transverse section plane, at least at each position between the position (x 20) of the groove and the position (x 22) of the fastening receptacle, a non-zero material thickness (e), and the ratio (e 22 /e 20) of the material thickness at said position (x 22) of the fastening receptacle to the material thickness at said position (x 20) of the groove being greater than 1, the thickness being measured between the transverse profile of the hot face and a straight segment, called "base", connecting the ends of the transverse profile (Pc) of the hot face, said positions being determined along said base, a transverse plane being a plane perpendicular to the direction of the length of the tile and a transverse profile being a profile in a transverse plane; the direction of the length of the tile being defined by the general direction of the groove; the direction of the width of the tile being defined by the direction perpendicular to the direction of the length, in the general plane of the tile; and the thickness being measured perpendicular to the directions of the length and of the width; the position of the groove (x 20) along the base being identified by the position of the point of the groove closest to the base; and the position of the fastening receptacle (x 22) along the base being identified by the position of the point of the fastening receptacle closest to the base, the tile being characterized in that the material thickness progressively decreases from the position (x 22) of the fastening receptacle to the position (x 20) of the groove. - a face, called "hot face", which is intended, in said service position, to be exposed inside the furnace; - a face, called "cold face", opposite the hot face, defining: - a groove extending over the entire length of the tile and intended, in said service position, to receive one of said tubes; and - a fastening receptacle configured to receive, in said service position, an anchor, or "retaining member", so as to immobilize the tile with respect to said tube, - a groove extending over the entire length of the tile and intended, in said service position, to receive one of said tubes; and - a fastening receptacle configured to receive, in said service position, an anchor, or "retaining member", so as to immobilize the tile with respect to said tube, the tile having, in a transverse section plane, at least at each position between the position (x 20) of the groove and the position (x 22) of the fastening receptacle, a non-zero material thickness (e), and the ratio (e 22 /e 20) of the material thickness at said position (x 22) of the fastening receptacle to the material thickness at said position (x 20) of the groove being greater than 1, the thickness being measured between the transverse profile of the hot face and a straight segment, called "base", connecting the ends of the transverse profile (Pc) of the hot face, said positions being determined along said base, a transverse plane being a plane perpendicular to the direction of the length of the tile and a transverse profile being a profile in a transverse plane; the direction of the length of the tile being defined by the general direction of the groove; the direction of the width of the tile being defined by the direction perpendicular to the direction of the length, in the general plane of the tile; and the thickness being measured perpendicular to the directions of the length and of the width; the position of the groove (x 20) along the base being identified by the position of the point of the groove closest to the base; and the position of the fastening receptacle (x 22) along the base being identified by the position of the point of the fastening receptacle closest to the base, the tile being characterized in that the material thickness progressively decreases from the position (x 22) of the fastening receptacle to the position (x 20) of the groove.