Abstract. The most critical components of a fusion reactor will be the solid surfaces that come into contact with the hot fusion plasma. In this work, three important phenomena affecting the heat loads on plasma facing components are analysed in detail. The heat transport in the SOL-region and the heat load asymmetry on the divertors in particular were simulated using the orbit following code ASCOT. The ELMs are analysed with respect to plasma edge stability changes when moving from the standard H-mode Type I ELMs to small and benign Type II ELMs. Finally, the hot spot formation in LH-grills is modelled using PIC-simulations.