Abstract: A heater element support frame is pivotally mounted at one edge to a support member attached to a reflector for movement between a first position disposing the frame adjacent to the reflector and a second position in which the frame is spaced from the reflector. Heater element end caps are slidably mounted in slots formed in sidewalls of the frame and mountable in a selectively adjustable position along the slots. Alternately, slots are formed in the reflector and arranged in a dimensional relationship to receive the end cap mounts such that the ends of two adjacent alternating heater elements of two side-by-side arranged columns of heater elements are offset from each other such that the heat generating portion of one heater element overlaps a non-heat generating portion and the end cap of an adjacent heater element.