You could use one of these, but you would need a generator or a way to plug up at the site, or you could run the 12 volt off your truck battery, but the truck would need to be running while it is in use.
Roy, you'd be much better off with a 120 volt heater to get a decent rise on the water temperature at 8 gpm. The ADC burner has a very small fan in it, so you can only put so much fuel through it before getting a sooty burn. The SDC burner will support a higher combustion rate, but you've got to...
Super Swivel, 1/2" FPT X 1/2" FPT
5,000 PSI, 400°, Greaseable
Regularly $50.11
Sale price - $33.00
Plus shipping. Good through 11/30/13
Buy 4, we ship them free!