>     Buy the smallest size with the battery operated
>fan and use with the top popped but avoid sleeping
>while in use.    Lack of oxygen is the most serious
>drawback.

Thanks Gary. I did mention that I promise not to sleep with it on.  :-) I
could not sleep with any kind of  heater inside the van. Its making it warm
enough to dress and undress, and fall asleep that I am wanting to deal with.

From what I can tell, using btu, to watt, to heat conversions that confuse me
no end, 1K btus should be able to warm a vanagon enough for me, with all kinds
of variables, but I was hoping to hear some actual experiences.

Guess I will find out this weekend. <g>

Much obliged,

John