Fabricate steam pressure washer?

Hi,

Anybody fabricate a water heater for a pressure washer making a steam pressure cleaner?

I looked online for the afterheater types for hooking to my 3000 psi 2.7gpm sears pressure washer.

I see plenty online, they all cost 1500 or more. My dang pressure washer only cost 550.

I thought I would make one out of some copper tube and 5 gallon bucket full of burning gasoline but I havent been drunk enough for my creative gene to fully come out. Just kidding.

Obviously there are safety factors to take into consideration and I am not looking for speculation on how dangerous running a flame thru a coil of tubing with 3000 psi can be. I am looking for real experience if possible.

Anyone out there make a steam cleaner?