It does produce moisture as I explained in previous post. If you have proof that no moisture is produced then get busy and write a paper. It's going to upset a lot of chemistry.

:-)

Combustion of a hydrocarbon in an oxygen containing atmosphere does produce water vapour. I bet you don't see that water vapour coming out of the tail pipe of your van when the van is warmed up. But you sure see it when it's cool outside and the van has just been started. And in really cold places, and I've seen this in Edmonton, you get quite thick clouds of ice crystals at stop lights from the car exhausts.

Stick a cold bit of aluminum , like a 1/2" thick plate , above the heater. Before the plate heats up above the dew point at that position, you'll see moisture on the plate.

Actually it really doesn't matter if people don't believe the chemistry involved, you can believe what ever you like. That's been human nature for ever. I just find it hard to understand that in 2016 most people still don't have a grasp of science that was done way back beginning with Lavoisier et al.

Alistair

> On Dec 23, 2016, at 8:57 AM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> I am not sure that the Mr Heater produces vapor or steam. I have 2. Yes
> there's condensation on the propane bottle when in use but not vapor from
> the radiant heat. I think the interior of the van and other stuff in the
> van contain a small percentage of humidity and the heat from the heater
> makes the humidity evaporate.
> Similar to hanging a wet cloth or a wet towel in front of the heater...
> steam will come out of it