fig
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Posts: 10
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Post by fig on Nov 23, 2019 5:19:03 GMT -8
I have a pellet stove in my living room. I am considering replacing it with a rocket type heater. I like the batch box type most. Is there a way to size everything according to the existing 3” pellet chimney? Im not looking to heat the whole house. Just the living room which is pretty small. I’d say approximately 10’x12’
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Post by wisc0james on Nov 23, 2019 5:58:12 GMT -8
According to people smarter than I, 4 inches is the smallest that's possible (assuming a good, natural chimney draft), and 6" is the smallest that is reliably functional. I think 3" would be a surprising innovation, and would more likely be a frustrating endeavor.
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Post by wisc0james on Nov 23, 2019 6:00:01 GMT -8
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fig
New Member
Posts: 10
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Post by fig on Nov 23, 2019 6:51:54 GMT -8
Ok thanks. I kind of suspected that but I don’t much about this.
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fig
New Member
Posts: 10
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Post by fig on Nov 23, 2019 7:09:22 GMT -8
Manner
Is that a three inch chimney?
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Post by smartliketruck on Nov 23, 2019 10:31:38 GMT -8
To have any chance of working you'd have to make both the firebox and the riser out of pretty insulative material. Last year I played with a 2.5 inch core constructed of 2 inch thick Roxul panels with a skim coat of flyash and waterglass. The pieces of wood were pretty small the burn time pretty short but it did run fine without the aid of chimney draw.
Edited to add: While the flyash skim coat worked well enough for the test, it is NOT very long lived.
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Post by mannytheseacow on Nov 23, 2019 11:50:06 GMT -8
It’s a 4” (125mm) stove with a 6” chimney. I’ve never tried going 3”.
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Post by gadget on Nov 26, 2019 7:05:49 GMT -8
You could consider using a blower on the exhaust. It would definitely work then. I ran a RMH with a 3" CSA exhaust last winter. It was in a greenhouse. You would want a secure and seal burn box if you had a blower on a heater that is indoors incase the blower goes out for safety. You can get more heat then you need if you use a blower.
I have a spare tap on my water heater 3" flue pipe down stairs. My furnace use to use it. It is a high efficiency model now with a PVC exhaust. I would like to build a mini 3" vertical heater for backup connected to the 3" chimney. No blower, just enough heat to keep the pipes from freezing. Chimney is triple wall.
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Post by roelof on Nov 27, 2019 16:22:41 GMT -8
Hi fig , if your exhaust is only 3" and you cannot change that, I agree with gadget that you would need a blower. At least for the first batch, when the stove is still cold. I recently built a 3" batchrocket that works well without it, but it has a 4" exhaust pipe. It heats my 9' x 14' caravan with only 3 - 5 kilo's of wood a day. Here it is: youtu.be/PibOTvSaRE8
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