PURPOSE: To provide the radiator for floor heating which is simple in structure and light in weight while using a small-scale equipment by a method wherein an insulating material of honeycomb structure having a hot-water pipe embedded therein is placed between a surface material and a backing material.

CONSTITUTION: The insulating material of honeycomb structure having holes 7 and also having the hot-water pipes 4 embedded therein is sandwiched between the surface material 2 and the backing material 3, to constitute a radiator main body. The pipes 4 are fitted to the surface material 2 through a heat-conductive material 10. The radiator having a sufficient strength and being simple in structure and light in weight can be obtained by connecting the radiator main bodies together in such a manner as to form the radiator for floor heating.