Math Easy Solutions, calorimetry just means measuring heat as carefully as possible — in this setup, the Dewar/water bath is there to track how much heat the cell gives off or absorbs, not to create the effect itself. A Dewar flask is basically a thermally insulated container, so if the electrolysis cell gets warmer than expected from the electrical power going in, the calorimetry is supposed to catch that Wikipedia, ScienceDirect.

So yes, there’s a temperature difference involved, but the point is measurement, not generation: you compare electrical input vs thermal output and see whether there’s “excess heat” beyond ordinary chemistry LENR-CANR review. That’s the whole fight in those experiments — not “is water making heat,” but “did the cell produce more heat than the current should account for” this thread.