Insert top at 900+F at slow burn?

[BIG JAKE]

I think your thermometer is no good. You need to find a way to verify that. You could set your oven to 400 and pop it in there and see what it reads. Should read within 50 degreees of setpoint

 

[Streblerm]

Excellent points about checking the accuracy of your thermometer.

What kinds of burn times are you getting? How long do you get between 600-900 degree output and how long can you go before you have to completely rebuild the fire meaning how long do you have enough coals to relight a fire.

 

[md1486]

I think your thermometer is no good. You need to find a way to verify that. You could set your oven to 400 and pop it in there and see what it reads. Should read within 50 degreees of setpoint

Yes good idea im gonna try that tonight

 

[md1486]

Excellent points about checking the accuracy of your thermometer.

What kinds of burn times are you getting? How long do you get between 600-900 degree output and how long can you go before you have to completely rebuild the fire meaning how long do you have enough coals to relight a fire.

Normally i can get 4 hours of burn time with flames, then with coal left I can reload a fire within 2 hours of that, so 6 hours. But my insert is not that big (2 sq.ft I think) But sometime after like 20 hours I rebuild a fire with papers, and papers ignite by itself with the coal left. IMO this seems pretty decent burn time

 

[md1486]

I found my answer by looking at the manual. I had read it before but didnt see it. Manual say maximum efficiency at 500C (900F). So my burn is ok but my thermometer useless since it goes only to 900F. Thanks everybody for replies.

 

[moresnow]

hi guys,
I have an insert wood stove that Im used to since I burn 6-7 face cords per year. By curiosity I put a thermometer on top as you can see in the pics, it shows 900+F after 1hr burn and air flow all closed.
What can be wrong ? I thought that 400 to 650F was the normal for stove top temp. Thermometer is new.
Thanks

If your fire is this active at the 1 hour point I bet you could try shutting down the primary air much sooner in your burn, or you have a gasket issue. Maybe?
Is this a standard load size? Looks like just a few splits? Your burn time would be much longer if you stuff the box full. What is the make/model? Good luck!

 

[NSMaple1]

I can't see needing a thermometer that goes past 900, for stove or insert operation. Except maybe for a cat thermometer in a cat stove. That seems awfully hot. Also not sure about the wording in the manual. 500c and up? Yikes.

It does say in the firebox though. Which a magnetic thermometer won't tell you. Does it instruct on exactly how & where to measure temps?

Exactly what do you have for an insert?

An IR gun should tell you roughly how good or bad the magnetic is.

 

[md1486]

I can't see needing a thermometer that goes past 900, for stove or insert operation. Except maybe for a cat thermometer in a cat stove. That seems awfully hot. Also not sure about the wording in the manual. 500c and up? Yikes.

It does say in the firebox though. Which a magnetic thermometer won't tell you. Does it instruct on exactly how & where to measure temps?

Exactly what do you have for an insert?

An IR gun should tell you roughly how good or bad the magnetic is.

This is the only information available about temps. They dont instruct about how/where to measure it. I dont know if temp in the firebox vs temp right on top of the stove would differt a lot.
This is a BIS Ultima insert, 55 000 btu , about 2 feets cube if I remember right.

I closely monitored temp yesterday, it goes up to 900+F about 30 min after startup, then I start the blower and it goes down to maybe 600F. But as soon as I reload the stove, and shut down air flow within minutes, temp goes up to 700-800F. Air flow all closed. Maybe this is how it is suppose to burn. Never had any problem with it.

 

[NSMaple1]

This is the only information available about temps. They dont instruct about how/where to measure it. I dont know if temp in the firebox vs temp right on top of the stove would differt a lot.
This is a BIS Ultima insert, 55 000 btu , about 2 feets cube if I remember right.

I closely monitored temp yesterday, it goes up to 900+F about 30 min after startup, then I start the blower and it goes down to maybe 600F. But as soon as I reload the stove, and shut down air flow within minutes, temp goes up to 700-800F. Air flow all closed. Maybe this is how it is suppose to burn. Never had any problem with it.

But do you know if those temps are accurate?

 

[md1486]

But do you know if those temps are accurate?

Yes I checked the thermometer temp yesterday in the oven and it was accurate

 

[md1486]

Update: I have called the company, they cant even tell me about expected temps for the stove, although they find 900F to be quite high.

I ran my stove tonight and close air flow sooner when it reaches 500F. Now he run at 550F with turbulent flames. The problem is that I dont get my secondary combustion doing it this way. Dont know if its better 800-900F with secondary combustion or 550F without.

 

[NSMaple1]

Yes I checked the thermometer temp yesterday in the oven and it was accurate

That might not be an accurate test. I think ovens only go to 500 or so? Have an IR gun?

 

[md1486]

That might not be an accurate test. I think ovens only go to 500 or so? Have an IR gun?

Well I tried it at 350F and it give me 375F, so seems accurate. Maybe at higher temps it is not. I dont have an IR thermometer. I just reload the stove, 5-7min with good air flow, then close everything. Now stove top at 900F with good secondary combustion...maybe I shouldnt have bought that damn thermometer haha

 

[CaseyForrest]

Whats the moisture content of the wood you're burning?

 

[md1486]

Whats the moisture content of the wood you're burning?

Between 18% and 22% inside fresh split log.

 

[CaseyForrest]

Between 18% and 22% inside fresh split log.

That's good. I may have missed it but what species of wood are you burning?

sent from a field

 

[md1486]

That's good. I may have missed it but what species of wood are you burning?

sent from a field

Mostly sugar maple and oak

 

[moresnow]

Update: I have called the company, they cant even tell me about expected temps for the stove, although they find 900F to be quite high.

I ran my stove tonight and close air flow sooner when it reaches 500F. Now he run at 550F with turbulent flames. The problem is that I dont get my secondary combustion doing it this way. Dont know if its better 800-900F with secondary combustion or 550F without.

Starting to shut air down at 500 in a couple of increments sure sounds safer! Is the stove still gaining temp at this point? Is it producing lazy floating dancing blueish/orange flame above the splits when doing it this way? If it is you are indeed getting correct secondary burn characteristics. Hard charging jets of yellow flame being expelled from your secondary system for more than a short time may indicate that you are burning with more primary air than nessasary.

 

[md1486]

Starting to shut air down at 500 in a couple of increments sure sounds safer! Is the stove still gaining temp at this point? Is it producing lazy floating dancing blueish/orange flame above the splits when doing it this way? If it is you are indeed getting correct secondary burn characteristics. Hard charging jets of yellow flame being expelled from your secondary system for more than a short time may indicate that you are burning with more primary air than nessasary.

I get charging jets from secondary burn for maybe 30minutes after reloading. Then I get a lot of dancing flames. But even when I completely shut down air flow when it reaches 550-600F, the temp eventually goes up to 850-900F. I cant do anything to lower temp since everything is close. But except for the high temp, stove seems to burn really well, turbulent flames, no burnt smell, no glowing stove/pipe. .And if I close air flow too soon after reloading (450-500F), I only get a few flames covering like 25% of the load in the stove.

 

[U&A]

How thick is the piece of steel you’re reading temperature off of on top of your stove?

In your picture it looks to be fairly thin sheet metal and that is going to show much higher temps.




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