I tried using the aquatuners to cool water. Both of the units that I added are calling for 1200 watts of power each. I am assuming this is a mistake, lol. I doubt you would need two generators to power one aquatuner. I did reload the game and and tried rebuilding the aquatuner to see if anything fixed it but it was the same.
Steps to Reproduce
Build a Thermal Aquatuner with power and water supply.
This issue has not been confirmed by a developer yet.