The paper presents the experimental research findings on the collisions of droplets in a high-temperature gaseous medium. Solution droplets were studied colliding with each other and with water droplets. Significant differences were established between the conditions and characteristics of surface transformation and collisions between droplets of water and highly viscous solutions with low surface tension at different temperatures of the gaseous medium in the heating chamber. We determined how the temperature of the gas medium affects the position of droplet collision regime boundaries on the corresponding maps in the B(We) coordinates. We also established the main differences in the number and size of secondary droplets formed from the collision of two primary ones. Finally, key patterns were identified for the collisions between two-phase liquid droplets containing vapor bubbles at a high temperature of the medium.