Any advice on doing this?
You'll have to excuse Ben he's
a douche French.
To go hot, you just need the Corwoods boiler, advertised on the rolling banner at the top of the page.
You cut the hose that goes from pump to reel and collect the boiler in series.
Hang it up, on an open back door of your van or something.
Connect the gas regulator, supplied, to your PROPANE (reddy orange bottle) after securing the bottle with a ratchet strap or something.
Check for leaks.
Put a couple of D batteries in the chamber, turn your boiler on, turn your water on, turn the gas on.
The water flowing through the boiler triggers the spark that ignites the gas.
Fiddle with flow & temp numptys till you're happy.
And Roberts your fathers brother.
It really is simple.