That sounds simple enough. The thing I remember looked like a big tank on iron wheels. Probably 6' high and maybe 8' long. It had a tow bar so it could move to a remote job site. I don't remember a water hose. I bet, now that I think again, that the tank may have just been a water reservoir and the water dropped into the heating coils you describe from gravity. Seems like you would need a check valve so the steam doesn't get pushed back into the tank. Or maybe thats your safety valve. If you don't use the steam immediately it pushes back in the tank so the coils don't spring a steam leak.
I also remember about a 15-20 foot hose attached to a handle (essentailly a wire coil standoff handle) with a 2 foot copper wand with 45 degree bend at the end where the steam comes out.
I just may give this a shot. I sure have enough need to strip grease off vehicles before I work on them. I'm thinking immediately of my '93 S-10 with 300,000 miles. Then I would like to keep my '92 'vette engine a little cleaner. Can't use a high pressure hose on it as water accumulates in the cylinder Vee and kills the starter. At least thats what the Corvette news group warned about.
And of course my future 'bolt I'm looking for will need cleaning to work on.
I wonder if you could use copper for the coils? Hmmmm...
Thanks Wade