The ornamental design for a radiator for heating, as shown.
FIG. 1 is a front, top perspective view of the radiator for heating showing our new design;
FIG. 2 is a front perspective view of the radiator for heating showing our new design;
FIG. 3 is a front perspective view of the radiator for heating having a dash-lined circle enclosing in area the radiator for heating to be enlarged in FIG. 4; and,
FIG. 4 is an enlarged top perspective view of the circled area shown in FIG. 3.
In the drawings, the broken lines shown in FIG. 4 depict environmental subject matter only and form no part of the claimed design.