Damn Gus when did they give you the ban hammer?
Anyway .... back to the topic.
A SAFE HHO heater has always been an interest of mine as I freeze my ass off in the winter working on HHO in the garage. It only took one month of running an electric heater in the garage to realize the $150 a month extra was better served towards projects rather then comfort.
I think the one main thing people dismiss with using HHO as a heater is that it reacts differently to every material you place in it's flame. So the real key to me is finding the right material to heat and or use as a heat exchanger in order to see better results then an electric heater that is very efficient in itself.
One idea I came up with that is NOT SAFE but would produce tremendous efficient heat would be to have your hho flame inside of a sealed metal sphere, remember the O is in there so no need for outside air for it to burn and when it burns it drops in volume so much the sphere would take a long time to fill up with water. So think of the sphere and burner inside as a filament that would need to be changed. So you take this sphere and place it in a standard oil based radiant heater and I think you will find that it will out produce an electric heater.
THE BIG HOWEVER though is finding the right size and strength to the sphere so that it does not blow up and hit you with hot oil and shrapnel when your flame burns out and the ignitor kicks in.