On 5/3/10, David Beierl <dbeierl@attglobal.net> wrote:
> The current versions of Mr. Heater have an oxygen sensor that shuts
> the device down before the mixture changes enough to generate
> significant amounts of CO...

I have heard that the safety feature can be fooled by the reduced O2
encountered above 9000' or so.  Anyone had experience with this?

Yes, I do often camp above 9K' and, of course, that is just when a
heater is most welcome.

Currently I use the simple Coleman catalytic with the battery operated
fan but only when I am up & awake and (as noted) the Westy is leaky
plus easy top venting thru the roof vent.

Geo