Radiant heat ... Panel. Radiant heat does not effect ambient temps. Radiant by definition heats objects not air. Little to no effect on air temps.

Che or any light (every) electric light on the market heats air. convection sources goldenrod heaters too.

The smallest I can think of are high output led panels. Likely the best would be fld tubes.

The logical question is why are you looking for a small convection heat source what are you trying to do?


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