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wood stove in green house

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by fespo, Jun 22, 2013.

  1. fespo

    fespo Feeling the Heat

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    Hello everyone, I bought a new 10x12 green house that I want to keep warm in the winter. I'm looking for any brand of stove as long as it is cheap. The question is, has anyone or know anyone who has done this? I went and looked at an old blaze king for 250, but I can't find any info on the net about it. I missed one stove with flue for 150. Any idea would be great. I have not set up the green house yet, I waiting till fall. Thanks Frank

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  2. SteveKG

    SteveKG Minister of Fire

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    I have a 12 x 23 ft greenhouse attached to my house, opens into the house via French doors. I have a wood stove out there which I light maybe 20 nights a year. Works fine. The portion of the roof above the stove is wood framed, so it was easy to put a chimney pipe up through it. I have only read about, and not done, a chimney through a glass-panelled roof.

    I do not attempt to heat the greenhouse space 24/7 in order to grow winter crops. That would require, as you can imagine, a lot of monitoring and reloading and a hefty supply of wood. The greenhouse does not hold heat as would a regular room, so I have to load the stove one last time right before I go to sleep, as late as possible. I am interested in keeping the room from freezing. This is even with double-paned glass and a well-insulated floor [tile over concrete over 5" foam panels]. If the stoves goes cold, and it's zero F. outdoors after a cloudy day, the greenhouse will be in the mid-thirties in the morning. Unless I stuff the stove that last time, perhaps at midnight or so.

    But, it works.
  3. begreen

    begreen Mooderator Staff Member

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    Our greenhouse is 12 x 20. I have our Jotul 602 in there. It has saved crops more than once when there is a sudden dip in temps in late fall.
  4. DevilsBrew

    DevilsBrew Minister of Fire

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    I know of people that use various types of stoves for their greenhouses. I am not recommending it because I have never done it myself. I am only throwing out there. So yes, there are people who use stoves to heat their greenhouses.
  5. begreen

    begreen Mooderator Staff Member

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    A used Godin stove would be nice, compact, affordable and good for a boost.
  6. mellow

    mellow Resident Stove Connoisseur

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    I helped a friend install an older pellet stove in his greenhouse, easy to vent, he already had power run to it for lights so that was a bonus, you can't beat having a thermostat that will automatically kick it on. Keep an eye out on CL this time of year and yard sales.
  7. trx680

    trx680 New Member

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    Ive heard of taking BLACK 55 gal plastic drums and filling them with water and putting them in the greenhouse. During the day the black drums become hot from the sunlight. At night heat will radiate from them. If I ever get a greenhouse I'll try it.
  8. Augie

    Augie Feeling the Heat

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    If you add this + a woodstove you would be set. Your not looking to keep the greenhouse tropical usually but overnight temps in the 50's would be ok. Water as a storage medium and a woodstove to heat the place, make a simple heat exchanger and you are good to go. I have thought of this myself as Id like to grow some veggies in the winter and get a jump on growing in the spring. .
  9. fespo

    fespo Feeling the Heat

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    Im having a hard time finding a stove cheap. I found a V C on C L for $500.00 but more then I want or can spend. And I don't want a hunk of scrap.
  10. begreen

    begreen Mooderator Staff Member

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    At that price put in an Englander VL 17.
  11. fespo

    fespo Feeling the Heat

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    Ok, I got the V C stove, the person I got it from wants me to check everything out first. She let me take it home with out putting any money out for it. Ok this is what I know. It's a V C Intrepid II, in the inside of the stove is 1987. It looks like it in good shape. I know I need new gaskets. There is 2 pieces glass for each door that has been taken out by someone, not me!!! I have not looked into anything else yet. This should be more then enough for my green house. Now I can not find a owners manual online for a 1987. Please help, Thanks Frank
  12. Sprinter

    Sprinter Minister of Fire

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    Put in lots and lots of thermal mass close to the stove so it can absorb heat directly from the stove. In addition to the water drums, I have a friend who put in a 14" thick concrete floor with insulation under that.

    I'm playing with the idea myself for our 10x20. I'm just not convinced yet that it's worth it.
  13. DevilsBrew

    DevilsBrew Minister of Fire

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    I am very interested in this concept so please keep posting, Fespo. I would like to see the results.
  14. vacation

    vacation New Member

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    10x12? Get a vent free propane stove and put a borometric damper somewhere.. your plants will enjoy the heat, C02 AND moisture... No brainer!
  15. fespo

    fespo Feeling the Heat

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    Wow James, for new member with 9 post you know it all thanks!!!!!!!!
  16. SteveKG

    SteveKG Minister of Fire

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    For years, I've been told and have read sources in the greenhouse community that combusting propane can emit sulfurous compounds which will burn and harm plants in a greenhouse. Therefore, they say, only use a vented-to-outside propane heater around plants. The Hobby Greenhouse Association, of which I used to be a member, says the same thing.

    I have no personal experience, though, and the OP wants to use a wood stove anyhow. I did purchase an Ecotherm heater [propane] for a room adjoining the greenhouse, one of those which brings in outside air for combustion and vents the exhaust back outside, no indoor air used or mixing. I could, if ever needed, run that Ecotherm and leave the room door open to keep the greenhouse from freezing, were I to be gone for a while during the winter. However, in 20+ years, I've never had to do so.
  17. begreen

    begreen Mooderator Staff Member

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    Depends on the greenhouse location. In Western WA moisture in the winter can be the enemy of the greenhouse. I literally go all winter with just one or two watering in ours. The key is to keep the soil surface dry, otherwise fungus and fungus gnats start taking over the place. Ours is 12 x 20 and I heat it at night to about 40F with a small electric heater. It is well insulated on the north side and with double pane glass on the south side. That seems to work well. When it gets extra cold I will fire up the Jotul in there.
  18. oldspark

    oldspark Guest

  19. oldspark

    oldspark Guest

  20. SteveKG

    SteveKG Minister of Fire

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    The James McCullagh book is what I used to design my greenhouse, and I still have the book. Someone gave me a brand-new [never read] copy lately and I gave it to our library.

    It is why I have a wood-framed area of the ceiling in the greenhouse through which to run my wood stove pipe.

    Anyone building a greenhouse from scratch, whether to run it passive heating or adding a wood stove for supplemental would do well to read this one.

    As I mentioned earlier in this topic, wood stoves do fine in greenhouses. I have an old Rais-Wittus stove out there in mine, it's great.
  21. fespo

    fespo Feeling the Heat

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    Thanks for the info update!

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