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Q&A Direct Vent question

Post in 'Questions and Answers' started by QandA, May 26, 2007.

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  1. QandA

    QandA New Member Staff Member

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    Nov 27, 2012
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    Question:

    We have a wood burning stove on an interior masonry wall and want to replace it with a gas stove. We have 8" stove pipe going through a cathedral ceiling and would have to have a vertical run of approximately 17 feet from the top of the stove to the top of the pipe outside on the roof. Our house is small, around 1200 square feet and we want to use the gas stove as a primary hear source with our heat pump as the backup, or alternate source. I know if we go with the direct vent we will have to replace the pipe, but my question is will the stove draw properly with that long a vertical run? Would we be better off to use a B vent instead? Also, what is the average usage of LP if the average night temp is around 26 degrees and daytime temp is around 35 to 40 degrees. As with some of the other comments I have read, we have received as many, or more, answers that are different. By the way, our house is extremely air tight. We have to crack a window at night in the winter or else we wake up with headaches because of oxygen depletion when using the wood burning stove. We live in a rural area and choice of stores is limited. We are currently comparing Vermont Castings Radiance with HearthStone Sterling. Any comments on either one of these? The price is comparable.



    Answer:

    1. Length of Vertical DV Piping - This is no problem as long as it falls within the specs given by the particular manufacturer. Most of the current DV stoves are approved for this length (and more) of vertical piping. A direct vent will be more efficient that a B-Vent stove, and will work better in your tight home. Stay away from B-Vent because of the lack of air flow in your home. In addition there are Class A chimney adapters that allow you to utilize your exising class A chimney and essentially convert it to direct vent by running a 4" 2 ply aluminum liner down the chimney

    2. Stove Sizing - The stove can react to a thermostat, and many DV stoves can also be turned down, so sizing may not be too much of an issue. You would want a minimum of 30,000 BTU input , which would give you about 23,000 Output. A smaller stove may also do. Vermont Castings makes the Stardance and HearthStone the Tucson, which are both about 25,000 BTU, still enough to do the job.

    3. Brands. Vermont Castings and HearthStone are both well-known. You will not go wrong with either. Budget, style and size will come into play in making your decision.

    4. Use of LP - Assuming the stove averages 23,000 BTU Hour (in colder weather) input, you will go about 4 hours to each gallon of LP. In reality, the stove will cycle on and off most times, so your use may not bee that high

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