We claim the ornamental design for a radiant heater, as shown and described.
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FIG. 1 is a front perspective view of a radiant heater.
FIG. 2 is a bottom perspective view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a side elevational view thereof.
FIG. 6 is a left-end elevational view thereof; and,