A radiating pipe disposed in a floor for heating the floor includes an outer pipe (12) and an inner pipe (11), a heating cable (2) passing through the inner pipe (11) and the space between the inner pipe (11) and the outer pipe (12) being an empty air space. Optionally, materials such as sand, rock particles, a mixture or sand and rock particles, and concrete can be sealed in the empty air space. The inner pipe (11) and the outer pipe (12) can or at least one such pipe can be a copper pipe and the two pipes can be formed as an integral structure.