All reports on the forums lately have said that the aquatuner in fact, does not overheat, even to the point of being able to melt rock into magma. So I built out my steam turbine to turn heat from both the metal refinery and an aquatuner cooling the base into power. After some time, the aquatuner broke, and stopped cooling water, yet it continues to consume power. It also magically created a pocket of 100kg of steam inside the previously sealed and flooded with petroleum room it was in.
Steps to Reproduce
This issue has not been confirmed by a developer yet.