Just after the impact, the drop spreads over and around the pillars. At the end of the impingement process, the liquid height is equal to the pillar height and small puddles on top of pillars evaporate quickly. Pillars prevent the drop from receding, resulting in a large wetted area during the sessile drop phase. This significantly increases the heat flow, especially for small pillars, compared to smooth walls. The highest heat flow occurs during the spreading phase, as cold liquid rapidly wets the hot wall, causing a significant temperature decrease, especially on the pillars. The pillars extend both the wetted area and the contact line, which enhances heat transfer compared to smooth walls. During the sessile drop phase, the relative contribution of the contact line evaporation in the total heat flow is twice so high as in the case of a smooth wall. Generally, small and low pillars with narrow gaps are most effective for heat transfer. The maximum drop spreading on textured walls depends on the pillar size and arrangement. Low and small pillars increase the spreading, while high and large pillars reduce it. The sessile drop shape depends on the pillar configuration: small pillars with narrow gaps yield circular shapes, high pillars with wide gaps yield square shapes and octagonal shapes occur in between. These shapes result from differing flow resistance and capillary spreading along and diagonal to the pillar rows. The liquid volume does not affect the sessile drop shape as the pillar size is the determining factor. The maximum wetted area decreases and shifts to later times with lower impact velocities, but the wetted area during the sessile drop phase remains unaffected. Higher impact velocities lead to greater total heat transport due to increased convective heat transfer during the spreading phase. The sessile drop shape changes from square to circular with decreasing impact velocity due to varying flow resistances between and along the pillars.