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Rocket stove exhaust question

Posts: 2
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hi all, very new here and to rocket stoves...tried to find answer to my questions, but no luck...hoping for some help.

So, i build t a rocket stove, not a mass heater as first foray into this and just need to occasionally heat my small workshop. I built out of pretty heavy short water heater. Tank is prob 40" in dia and 36 hi. I built the fire box and internal riser from 1/16"(i think, not as heavy as i wanted, but it is what i had) 5x5 square tubing. I did not insulate the riser on this.

I went cheap on the exhaust for the trial run and just used 5" galv. gas vent pipe(will replace it, but is what i had). Stove has 90 at stove, a horizontal run for about 5ft. then another 90 and up about 12ft, but not totally clear of peak, but is probably 4' from roof surface.

My question is on exhaust. 1st run went great, it drew well before even starting a fire. Once lit, it drew very well, burned cleaned, was very happy and now ready to make this a little more permanent. I had 5" pipe, so used it for the ouput in the stove and matched up fine with the 5" galv. gas vent. My 2nd test run though it was much colder out and could get no draft at all smoked me out of the place.

My plans are to replace the galv with something else....6" black stove pipe or 6" stainless chimney pipe ($$$$) and was wonder on thoughts on this:

- Should i need or even use the insulated pipe for this rocket stove? even with the galv. the exhaust temp were pretty low...w/ in 18 of stove the paper sticker on the 1st 90 did not burn off.
- If using the insulated chimney pipe, should i Repostion the stove to avoid the 4ft horizontal run?
- If if get the insulated chimney pipe higher and away, will this usually take care of back draft problem?

Thanks for any help!!!

Posts: 293
Location: US, East Tennessee
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Chimney performance wise, you'll want the portion outside of the heated envelope of the structure insulated, and the exit point should be 2 to 3 feet above the roof's peak or any object or tree within ten feet. The 4 foot horizontal run should not be a problem.

About the stove, the steel in the combustion core will quickly burn out with the heat riser most likely being the first to go. Got any plans for building a replacement refractory core?
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