Exhaust temps, Catalytic stoves

My double wall pipe internal flue temp is reading 425 on the PH... could put my hand on the pipe for 20-30 seconds not a problem... Then got my IR gun and shot that outside of the double wall pipe, 150 degrees... so I'm thinking the PH is retaining it's heat pretty well.

 

Yes, I've done many tests and the internal temps on single wall are basically double the external on single wall pipe but they may lag behind a bit.

 

I notice the PH is not fussy about wood at all... I burned some red oak that was at 26% just to see what would happen... no issues... smokeless chimney top..

 

the new cat stoves are impressive

Gonna get a exhaust probe. I think it can tell me a lot of info on how well the combustor is performing.

 

I think it would be easier to just go with a pipe damper, then you have infinite control and if you ever did have a fire,,, you wouldn't be denied insurance because of a modified stove..

 

Yeah I guess a pipe damper would accomplish the same thing but I kind a wonder why manufactures don't build something into their fire boxes to keep more heat in the stove verses up the stack? Seems there's some room for improvement in efficiency with lower flue temps. Look at the WS PH and it's double baffle system, I bet that contributes to higher efficiency and lower flue temps.

 

That's what I burn ,, I find my flue gas temps and stove temps pretty well run neck and neck... I believe there is so much thermal mass that you can't keep some of that heat from going up the flue... At some point I would like to try a pipe damper just to see what happens, yet I don't want to cool the flue gases where I cause issues... I really want to install a wire probe to the back side of the cat, then I can see what MR cat is up to... Woodstock said there is a bolt in the back of the stove that I can remove to fish a wire in, then HT silicone the hole shut that the wire goes in... I think that the Cat is towards the back of the stove it just naturally runs the flue gases hotter... Yet at times I don't think I have an overdraft because I will get burst of gases wanting to burn off with the draft closed 100%,,, that tells me more air is needed... That happens with a big load that's shut right down quickly... Maybe the cat isn't hot enough at that point... I would like to run the damper when I see 500 flue gases, just to bring it down to 400 and see how the stove burns... Would it slow the secondary burn down, would it get the cat too hot ? That's why I would want to have something monitor cat temps before adding a damper... Don't get me wrong, I'm super happy with the PH...

 

Your talking internal temps correct? I would think 400-500 is a pretty low internal pipe temp, I don't know if I'd want to run much lower. I think my old BK Princess ran in that range with a full load and low burn setting for the first 1/3 of the burn.

My Fireview and Keystones were in the 500-700 range I believe.

 

Burning at hotter setting, 2.6
not able to hold my hand on the pipe

 

That pretty clean glass. And I notice you are burning e/w there. Why the change? Coal burn down?

 

Threw on 2 splits to help burn down the coals & keep the heat output cranking.

 

Yes , I'm talking about internal flue temps...probe reading..

 

Yes I believe that's the one I was told about, closest to the flue collar.. One on either side...