Two-dimensional simulation experiments have been conducted on the growth of an internally heated liquid pool in a solid bed. The solid bed is a water-soluble wax, whereas the liquid pool is an electrolyte solution. The liquid pool and the molten solid are mutually miscible. The initial density of the liqUid pool is greater than that of the solid at the melting point. The growth characteristics of the hot liquid pool in the solid are affected by the initial density, viscosity, and internal heat generation. The size of the liquid pool is affected only by power density.