Shear heating effect is the phenomenon that occurs during the flow of the polymer where significant increase of melt temperature is observed due to high shear rate. The increase of the temperature is related to the viscous properties of polymer melt. Viscosity is a measure of energy dissipation of the fluid during the flow. Due to high viscosity of polymers significant amount of energy is dissipated by heat. The heat does not propagate quickly, because polymers are thermal insulators and have very small thermal conductivity. It leads to the situation, where in small volume of polymer melt high amount of heat is gathered, what results with strong increase of the melt temperature. High temperature rise can lead to the degradation of polymer and result with burnings and quality defects of the part. In this paper the analysis of shear heating effect for different grades of polymeric materials were performed with Autodesk Moldflow Insight software. In the research the shear heating effect was investigated with different runner diameters and different flow rates of polymer melt. The research was conducted to obtain knowledge about sensitivity of different grades to this effect in relation to runner geometry that is crucial for mold balancing and process parameter that have the strongest influence to this phenomenon.