Ventless gas fireplace - effect on blooms?

watergal(z6/7 Westminster, MD)January 19, 2008

I know there is controversy about vented versus unvented gas heaters for orchids growing in greenhouses (I don't have a greenhouse, but I do fantasize).

My question is - how about ventless natural gas fireplaces? The best place to display my phals in bloom is in the same room with the fireplace.

What is everyone's opinion - will the fumes degrade the blooms? Thanks!

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I grew my orchids in the room next to an unvented gas fireplace for several years and never had any problems. I'd often put blooming ones on the mantle.

If your fireplace is functioning properly and burning completely, you shouldn't have a problem -- at least, that's my understanding. If it's putting off enough fumes to drastically affect your flowers, I would think that it could be causing problems for you, too.

You can always try it and see, call the manufacturer of your fireplace, or call a local store and see what they have to say about it. I'm definitely not an authority, but I never had any problems. :)


    Bookmark   January 19, 2008 at 9:40AM
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watergal(z6/7 Westminster, MD)

Stacy, thanks. I just had the fireplace setup cleaned, and I have a carbon monoxide detector in the room showing zero all the time, so hopefully it's OK.

    Bookmark   January 19, 2008 at 2:42PM
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I agree with turkey. A big drawback to a fireplace is the huge amount of heated air that is vented, modern FPs have heat exchangers to capture that vent heat. If yours is newly cleaned and "draws" well as a good design would, I think you will have no problem with your orchids.

    Bookmark   January 19, 2008 at 7:10PM
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As long as there is complete combustion of the gases, there should be no problem. However, the air around the plant maybe rather dry. Might desiccate flowers prematurely.

    Bookmark   January 19, 2008 at 9:08PM
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My understanding is that one of the by-products of natural gas combustion is water, so a ventless gas fireplace actually makes the interior air *more* humid. If the fireplace is working properly there should not be any "fumes"--just H20 and CO2. I hope I'm right, as we're also considering one of these fireplaces.

    Bookmark   September 4, 2008 at 10:43AM
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ttkidd(Toronto ON)

Have a look at the following link.

It explains natural gas chemestry pretty well. To sum it up though, you won't just be getting CO2 and H2O. You'll also be getting small amounts of carbon soot, carbon monoxide and nitrogen compounds. The more efficient your fireplace the less soot and carbon monoxide you'll get, but you won't escape the nitrogen compounds. They might not harm the orchids, but in high enough levels they aren't that good for you.


    Bookmark   September 4, 2008 at 6:22PM
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This is similar to one of the problems I deal with, growing indoors, as I do... our winter heating source is a wall-mounted propane unit. It dries the air terribly, but other than that, it doesn't seem to have an adverse affect on any plants. Two ceiling fans at either end of the one large room circulate the air very well. Compensating for the dry air, and the lower winter light, seem to be about the only things I can do to help.

I will be very glad to move into a home with normal heating and cooling systems, which should happen in about a year!

    Bookmark   September 5, 2008 at 8:25AM
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For 8 years I have had a small ventless gas heater in my orchid room...never lost a bloom or got a headache from any fumes.


    Bookmark   September 5, 2008 at 3:25PM
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I have a natural gas unvented heater in my growing room & have no problems with my orchids.

    Bookmark   September 6, 2008 at 7:55PM
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watergal(z6/7 Westminster, MD)

Thanks everyone! Fireplace season is almost upon us again. However, I've decided to display the blooming orchids in the dining room instead, mainly because there is really good indirect light there. I experimented with putting some blooming phals in dark rooms last winter. I left them there too long even though I didn't overwater, and it's been a long process getting them healthy again.

    Bookmark   September 24, 2008 at 11:35PM
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I'm pretty sure that ventless fireplaces have hazards especially in producing harmful gas by-products like carbon monoxide. If this kind of gas does harm to humans, it should affect blooms as well.

Here is a link that might be useful: Ventless Fireplace Hazards

    Bookmark   June 19, 2010 at 10:06PM
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