Oh 100% And I was thinking of extreme examples with the Pickering Nuclear station having (once up to) 8 550MW reactors dumping heat into a fairly shallow part of the lake and the NB reactor having no chance to remotely affect the bay of Fundy temps lol.

Lil halicination farms on the seafloor are a dumb idea but not because of heat affecting the environment beyond the thousands of organisms that would live directly on them.