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RE: [Aroid-l] Heaters, vented & otherwise (was "Anthurium")

  • Subject: RE: [Aroid-l] Heaters, vented & otherwise (was "Anthurium")
  • From: "Harry Witmore" harrywitmore@witmore.net
  • Date: Tue, 21 Nov 2006 19:46:54 -0500
  • Thread-index: AccNx2P0GpKnLFLuRju8YPUDOV0nyAAB7ijg

I have what I call my fern house with a propane heater in it not vented and
have had no problems I would attribute to the heater. Now, I do make sure
there is some fresh air coming in since if I don't and the fans go off it
goes out. So I think there is more of a problem with getting enough oxygen
to the heater than buildup of carbon monoxide or dioxide to the plants. At
least ferns that is. 

Harry Witmore
Cloud Jungle Epiphytes

-----Original Message-----
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com]
On Behalf Of Steve Marak
Sent: Tuesday, November 21, 2006 6:47 PM
To: Discussion of aroids
Subject: [Aroid-l] Heaters, vented & otherwise (was "Anthurium")

The topic of combusting greenhouse heaters without external venting came up
at an orchid society meeting a couple of years ago and the older, more
experienced growers unanimously issued dire warnings. Most said that their
orchids didn't die, but dropped flowers and leaves and generally ailed until
they vented their heaters externally or switched to another heat source.

I've always assumed this was due to carbon monoxide from incomplete
combustion, since that's always a concern when burning things indoors, and
since I've read/heard many times that carbon monoxide damages plants at very
low concentrations. I have no idea what the chemical mechanism would be and
for some reason find it counterintuitive, but it seems to be so - dying
plants is often listed as one of the things to watch for when a carbon
monoxide problem is suspected. 

But I've seen a lot of these self-venting greenhouse heaters advertised, and
I've used a portable kerosene heater to heat my sunroom, one winter until we
could get the failing house system replaced. I was meticulous about
everything to get the most complete combustion I could, used the heater the
bare minimum, and kept two carbon monoxide detectors nearby, and didn't see
any problems.

If there are people with experience here, I'd love to hear from them - I
need a non-electric backup heat source for a new structure.


On Mon, 20 Nov 2006, D. Christopher Rogers wrote:

> Hi Tom,
> The heater I purchased supposedly does not need a vent, but is "self
> and was sold as a greenhouse heater. You have given pause to worry 
> now! But then, my greenhouse is fairy small (17 feet x nine feet with 
> an eight foot peak), and I have a strong exhaust fan, a good 
> circulating fan, and three sliding glass windows that I use for vents, 
> one of which is immediately above the heater.

(stuff deleted)

> -----Original Message-----
> From: aroid-l-bounces@gizmoworks.com
> [mailto:aroid-l-bounces@gizmoworks.com]On Behalf Of Tom Croat
> Sent: Friday, November 17, 2006 2:34 PM
> To: Discussion of aroids
> Subject: [Spam] RE: [Aroid-l] Anthurium
> Dear Chris:
>             Will this propane burner be exhausted in your greenhouse.  
> You have to be concerned with the combustibles because as I recall we 
> caused leaves to fall off plants by using a burner within the greenhouse.
> Tom

(more stuff deleted)

-- Steve Marak
-- samarak@gizmoworks.com
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