I've seen a few pressure washer attachments that look like nothing more
than a common oil burner pump/fan/ignitor centered within a coil of
tubing through which pressurized water is passed. Seems simple enough,
especially since I've got the pressure washer and burner pump kicking
aorund.


I build some parts for Steam Action. They build industrial carpet cleaners.

They use a combustion engine to drive the pump, and make a stainless steel
heat exchanger to suck the heat off of the exhaust.