"consistent with the Rossi Reaction" LOL - you must be kidding.
Potassium carbonate in this experiment indicates that this is a Thermacore/Mills' reaction. A reactor almost identical to this was patented by Thermacore 19 years ago. On closer inspection, there is little unique here other than the borosilicate (if it is important) and the tungsten electrode. In fact, Thermacore reported both higher COP and a reactor that operated gainfully for over a year - and they used nickel instead of tungsten so it is probably a better choice. Plus, Thermacore received a broad and generic patent which is not limited to lower voltage regimes and covers any kind of electrolysis. USPTO - 5,273,635 December 28, 1993. Now expired but cannot be re-patented. From: Axil Axil If this high school reaction is consistent with the Rossi Reaction; a proton based reaction, I suspect that Rhenium is the mainline transmutation product. Since potassium is the not so secret sauce in this high school reaction, it lends credence to the speculation that potassium is also the secret sauce in the Rossi reaction.
