A radiant heater is configured to be positioned above a floor at a predetermined distance and to produce a generally quadrangular zone of heat within a predetermined temperature range, preferably between approximately eighty-five degrees Fahrenheit and one-hundred degrees Fahrenheit, on the floor. The heater includes an elongated burner assembly, an inner cone member, at least one emitter assembly and end plates which define a combustion chamber. The emitter assembly is configured to direct heat produced within the combustion chamber downwardly and outwardly to the floor to form the generally quadrangular zone of heat. A canopy is provided which directs heat heading upwardly and outwardly back downwardly toward the floor and toward the emitter assembly. A reflector pan is positioned below the burner and the emitter assembly and assists in directing the heat from the emitter assembly toward the floor. A blower assembly may be incorporated into the heater.