Is my Dolphin robotic pool cleaner sensitive to hot or cold water?
Absolutely, the colder the water, the less efficient the Dolphin robotic pool cleaner will be.
Water that is too warm and poorly balanced will likely contain large amounts of organic contaminants that could clog the filters and limit the adherence of your Dolphin, especially when climbing walls.
As stated in the warranty document, the robot should only be used in water temperatures 6°C - 35°C.