The optimum distance between an infrared emitter and the target material depends on the application, the emitter type, element spacing, and the required temperature uniformity across the surface. For static applications where both the heater and target are fixed in position, a typical recommended distance is 100–200mm.

In general, the greater the distance, the greater the radiant dispersion, which in turn facilitates uniform heating. However, positioning the emitter too far away may reduce heating efficiency due to greater energy dispersion.

A shorter distance can increase the concentration of infrared energy on a smaller area, potentially creating localised high-temperature areas. The ideal mounting distance should therefore be selected based on the required heating profile, material characteristics, and application requirements.