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Stokerace
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# Posted: 31 Dec 2024 04:05pm - Edited by: Stokerace
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I am interested to know what others with wood stoves have successfully done with their chimney design to get optimal heating benefit. I am considering copying something I saw in Switzerland, where a cabin's woodstove had it's chimney pipe run horizontally across the room before leaving the insulated space.
If I do run the pipe across the room, it will be 12' run at a 45 degree angle before turning vertical to pass through the roof. A total of 90 degrees in bends (vertical out of the stove, 45 to run across the room, then 45 back to vertical).
The only significant down side on my mind is not having an easy brush-out access point.
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travellerw
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# Posted: 31 Dec 2024 04:20pm
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There is a reason you don't see things like that here. Its not because it innovative and no one has thought about it. Its because it SIGNIFICANTLY raises the danger level of a wood stove for minimal benefit.
The cooler your pipe is, the higher creosote and higher risk of a chimney fire. So much so, that many local codes are changing and requiring double wall pipe.
You are much better off buying a high efficiency stove than trying pull BTUs from your chimney. Wood heating isn't really about trying to be efficient, especially if you have a good supply of wood.
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Stokerace
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# Posted: 31 Dec 2024 04:46pm
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Understood, thank you!
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ICC
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# Posted: 31 Dec 2024 04:55pm
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Pipe straight up out of the stove top with no bends is best for good solid draft. Some stoves will list a minimum length and, or a maximum length. There may also be a max single wall interior length for reasons of keeping a draft and enough heat in the piping to reduce creosote build up. Listen to travellerw.
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Brettny
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# Posted: 2 Jan 2025 11:21am
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If I have to remove more than the chimney cap to clean it in definitely not building a chimney like that. I go up through the roof on all of mine.
Cooling the smoke in a chimney makes creosote. Creosote makes chimney fires then add on the fact that it would be hard to clean..no way.
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Stokerace
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# Posted: 2 Jan 2025 01:15pm
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Ok thank you, very helpful
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Grizzlyman
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# Posted: 3 Jan 2025 03:10pm - Edited by: Grizzlyman
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Agree with all these reasons- not a good idea.
BUT- I have thought about this in the past and wondered if it actually would matter in reality.
food for thought…I wonder… how much does the extra pipe contribute to the total heat output of the entire system.for instance a 45* angle on a 10’ distance to ceiling makes it a 14’ pipe instead of 10’
How much total heat would that last 4’ produce vs the entire system. I bet it’s marginal at best. Especially since it’s the coldest part of the system… even if it was 10’ extra ft… it’ll be colder yet. I’ll bet it doesn’t make a difference.
Idk??
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gcrank1
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# Posted: 3 Jan 2025 03:34pm
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I had pondered it in my old cabin too. While pondering I just threw another log on while I thought about it 
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paulz
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# Posted: 3 Jan 2025 06:42pm
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https://www.extension.purdue.edu/extmedia/fnr/FNR-100.html
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ICC
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# Posted: 3 Jan 2025 07:08pm - Edited by: ICC
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Re: single wall pipe length. I would check to see if the stove mfg has a recommendation.
The current version of the user manual for my Vermont Castings Aspen wood burner states a maximum single wall connector pipe length of 8 feet up from the stove top collar. The reason is to be able to have a strong enough draft. And I believe them.
Many years ago someone I know bought the Aspen stove as I had said I was happy with it. After installation he was not as happy as I. He was downright peeved. He had draft problems. I could not understand why.
To make a long story short, his single wall black pipe was way too long. My cabin has an 8 foot high flat ceiling. Black pipe of about 5 feet.
His cabin had a 12/12 pitch roof with a cathedral ceiling over the stove location. The chimney exited right to one side of the peak. I think he had something like 14 feet of black pipe. After he hung 2 or 3 lengths of insulated pipe from the chimney support in place of some black pipe his draft improved a lot.
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Grizzlyman
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# Posted: 3 Jan 2025 08:19pm
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ICC
Because it was cooling to much and killing the draft? That’s kind of what I was thinking.
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ICC
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# Posted: 3 Jan 2025 11:53pm
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paulz
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# Posted: 9 Jan 2025 08:01am - Edited by: paulz
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While southern California burns, I up north have my cabin wood stove going almost full time (arrow straight double wall pipe all the way).
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