Vent pipe temperatures

We have a nearly 4 foot horizontal run on the big Whit and have one of those magnetic stick on thermometers on the pipe.

I am wondering what sort of temps other folks see while there stove is running.

With a good fire going we generally see 140-150 F on the vents outer skin.

The vent never has any creosote in it.

Really a shame they don't have an easily installed finned wrap with a little fan in it to capture and utilize that heat

 

With your knowledge, I'm sure you'll whip something together. A slow speed fan would do the job. Mine is showing 150*F and it's not running hard. No creosote is a good thing.

 

125 F approx., on the outer wall of the DuraVent pipe here, 290-300 F internal temp., as measured by the thermo probe, directly behind the Combustion Blower. ( That's burning Granules LG wood pellets, 1.4 lb/hr average feed rate. )

Those Hazelnut shells must really crank out the heat !

 

We're burning on level 3 just to keep the convection air above 200, the vent temp is 145 to 160.

 

Great, thanks.

Every stove will likely be slightly different.
Keeping the gas flow hot enough to prevent any creosote or or nasty formations is the trick

The flow from the pot through the heat exchangers and the the exhaust fan will definitely make a lot of difference in the temp at the outflow.

Our Quad 1000 will keep the vent hot enough that you will not put your hand on it.

 

Mine is at 150 most of the time.

 

I seen my rise to 200*F with the dist. temp at 250*F. This is the Harman Accentra with duravent vent burning LG's.

 

I think I would be getting quite nervous with the temp at 200 F

I have had the short vent on the P2 catch fire inside from buildup and this got the paint SMOKING on the inside of the house.

That issue has been resolved with adjustments to feed timing and blower air

 

The vent pipe on the ol' SCF 050 rarely got too warm to touch. The Revolution, on the other hand, will burn your hand. No temps unfortunately.

 

Agree, that is a beautiful thing. (One thing I don't miss from the wood burning days here.)

 

OH YEAH

Used to toss in a bunch of paper and cardboard in the wood stove and get it ripping about once a month.
(old wood stove)

That thing would get the chimney a howling like a jet engine.

That chimney was heavy brick with a 8 inch 3/16 wall stainless steel unit.
Nearly indestructible.

Used to get that thing all "SOTED UP" and then let it rip.
Would scare the hell out of the neighbors.
Flames and debris shooting into the night sky was always a sight to behold.

Was tough on top hats though.
Would turn them red and they would fly off into the yard

Get a quarter inch of nasty old "Sote" in the chimney and have a real display.

If'n your gonna do this stuff, ya better have a real hard core chimney with a heavy (real heavy liner) This one was suspended inside a larger brick chimney with a good air gap around it.

 

I had my CB1200 at 300 vent and 440 internall set on high with feed 80% open, using EasyBlaze pellets.

 

Smokin

 

Just curious.
Where are you guys measuring the temp at?
Near the stove? Two feet away? at the thimble?

 

the "no creosote" thing is likely more due to the fact your stove is running efficiently (burning all those nasty tars), rather than the fact that youre keeping a fairly low stack temp

 

Remember the temp temperatures are on the outside of the outer wall, it's more for the touching pipe temps.

 

I have nearly a 4 foot horizontal run on the big Whit (Needed that to get the stove where it would be centered on the raised hearth and have the vent thimble pass between studs, AND the terminus be far enough away from the closest window)

I have stuck the thermometer in various places along the run, from right at the connection to the stoves exhaust housing, all the way out to the one 45 in the run at the thimble.

The temp does not vary much along the pipe.

Since doing a real deeeeeeep cleaning the other day the temp dropped to 130 F instead of 140-150 F

That has got to be due to better/faster air flow through the pip

Here are some pix of the setup

The little Fur Child was there to help too

 

LW, as you are an experienced Stove guy, what would you think the minimum stack temp. should be for a decently operating Pellet stove?

Not looking for 'specifics', (or to put anyone on the spot) I was thinking 210 F would be an adequate temp. running the stove here.

Would appreciate your opinion / feedback on this.

 

Get below 100 F on the side you can touch and the thing is going to start gathering nasty crud on the inside.

Our baby Whit used to run a barely warm vent (it's only 2 feet long) and it would get nasty inside and if the stove got kicked up the stack would catch fire and then things got real interesting

 

Where in the vent are you measuring temps? And what are you all using?