New fuel in Salt water that burns

[pcnorton]

Nope.
There has to be a damn high temp to start with and OTHER fuels to sustain it.
There is no such thing as a free lunch.
Since the energy required to DIVIDE H and O is HIGHER than the energy they release when reuniting, due to dispersions and other factors, without OTHER fuel that gives additional energy a reaction of division and reunion can't sustain itself.
Otherwise, all you'd have to do would be ignite some H and O, obtain H2O, which would break in H and O due to the heat produced, and then reunite again and so on forever: perpetual motion, energy out of nothing.
Even if it WAS possibile (which it isn't but we are reasoning "per absurd" just to underline how absurd this is), you wouldn't be able to exploit any of this energy, because if you did, you'd rob the system of the energy necessary to sustain the reaction that would die instantly.

The Sun?

Paul