> I know years ago I was at a winter camp out and a guy was parked
next to me with an air cooled Westy with the gas heater, and it ran
all night. I know because there were no hook ups, and I was freezing
my a** off all night while lis
>  tening
>  to the hum of that heater.

I have an '81 with the gas heater and it cannot run
continuously.  With the engine off, it will run about
10 min on a timer built in the temp control knob.

Push it IN and turn and it winds up the timer.

The manual writes about using it once or twice to warm
up the van, but warns about running the battery down
with too much use.

And thanks to Robert Keezer, too!  Over the years I've
gotten parts for my heater to keep it running.

Richard