>> Not a physicist, but I wonder how much energy was necessary via the radio frequency generator to get a flame that looked like it could produce about 5 watts of power.
Burning salt water*
I suspect that the energy-in to energy-out is negative as is typical. But this experiment is just a beginning. It demonstrates a new method of separating H from O using salt water. Doping the water and using various combinations of radio frequencies and other possible energy inputs might some day find a formula that yields more energy-out to energy-in, though I suspect there is good reason to doubt that. :-)
If you liked burning salt water take a look at Purdue's approach to separating H from water.**