Like the feller says JP-4 is 'jet' fuel.  Turns out to be a kerosene style
stuff.  The vehicle heater is a heat exchanger type that has a combustion
chamber and a fan system.  Much like the "space heaters" you can find on
construction jobs.  The ones I am familiar with mounted on the right fender
of the M41,M37,m39 vehicles.  They were 24V though.  The one you have may be
a 12v or selectable.  A bit fuel hungry but very high BTU output.

pensioner (USA Arctic Test Center, USA Northern Warfare Traning Center, Ft.
Greely AK)