Unvented catalytic heaters also dump copious amounts of
water vapor
into the van...enough to rust it out from the inside with
regular use.
Plat-Cat makes the best ventded heater for a vanagon...lots
in the
archive...including a plat-ca- vs. propex comparison.
steve

Malcolm Stebbins wrote:

> Harald 90 westy said:
>
> > I found that a unvented catalytic heater can
> > give me a terrible headache if it stays on all night, even with a
> > window partly open.
>
> This may be so, but the heaters that I have used (81 gas & 85
> diesel), I only used for a few minutes in the morning to take the
> chill off while I/we dress.  A sleeping partner and a good sleeping
> bag and a stocking cap are enough for the night.   So for my usage
> pattern,  I think that for just a few minutes use (even 30), an
> unvented heater would work just fine for me.
>
>  Malcolm S