Abstract of EP0209626 An erosion resistant waterwall in which a plurality of erosion resistant stud members (16,18, 22) are attached to the exposed surface of a waterwall (10) consisting of a plurality of spaced water tubes (12) connected together by continuous fins (14). The size of the stud members relative to the tubes are such that a plurality of the stud members extend around the periphery of each exposed tubes surface in a spaced relationship in a direction perpendicular to the axis of each tube. The stud members may be in the form of steel balls (16) or small rod members (18, 22) attached to the exposed surface, and a ceramic sleeve (24) can extend around the rod members.