Following the thread along.  Seems there are several popular heater
types, ranging from the unglazed ceramic inverted on the westy stove,
to full blown furnaces (propex is a furnace).  Coleman (RIP) had
propane catalytics for years and mine still work pretty well.   Then
other radiant heaters like buddys, black cats, and so on rounding out
the bunch, with the exception of Rocket's kero blaster they all run on
either petrol or LPG.  Now since amount of energy going from fuel to
water and CO2 is gained by breaking CH bonds is proportional to the
number of bonds broken in the process, the most efficient is the Kero
using long chain hydrocarbons as the energy source.  The least
efficient is the Propane.  So for more BTU per buck stick with the
most efficient.

Lighting one candle with nominal airflow will keep the inside warmish
until you can caffeine or mate' up.  Several of our esteemed
adventurers keep the lid up but with a heat isolating membrane over
the upstairs to keep a modicum of the expensive hot air (we see a lot
of that around these days) in the cabin.  Bob has one I think.  A
sleepytime hat will do wonders for those of little thatch.  And I use
a makeshift shawl around my shoulders made of dead synchilla skins,
adjusted to cover those nasty drafts.

Oh ya, I do have a wondrous old propex which whines away under the
seat on occasion.

Some years a go a fellow in colorado made and marketed a certified
radiant heater with an exhaust system to vac the nasties outside.
Disremember the fellow and the name of the heater.

The organic squirrel coats can be a problem as the squirrels tend to
come out of hibernation and scurry around inside the coat.

Pensionerd.,