These heaters have ceramic heat emitters with a resistive filament embedded in a ceramic plate. They take a few minutes to warm up. They produce mainly long wavelengths of infrared, and so the method of heat transfer is almost exclusively by convection (they warm the air). This type of emitter is not suitable for use in draughty buildings or buildings with high ceilings. Also, they do not ‘throw’ the heat very far compared with shortwave infrared heaters. We do not sell these.