700 degree flue temp

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Do you have turbulators installed in the fire tubes?

How much wood have you burned since you last cleaned those tubes?

That sounds like a lot of heat going up the chimney to me.
 
Are those internal or external readings? Either way I'd lean towards saying it is too hot. I run 400 degrees external on the single wall pipe about 16" from the boiler exit. I adjust my fan blades a couple times during a burn to keep it at 400. It never gets above 450-500.
 
I run 400 to 450 internal temps in the center of the pipe. This translates to about 250 on the outside of the pipe & the Atmos really heats at these temps., Randy
 
I have never measured 700° stack temps on a solo plus. I would say the tubes probably need cleaned... sometimes a brushing isn't enough... they might need scraped.

cheers
 
I'm with piker. Scrub tubes very hard. Clean turbs. Clean all ashes out of boiler.


Adjust air? Check after cleaning.


My Innova runs about 400 stack temps after cleaning. If it gets to 500 plus means time for a scrubbing.
 
Initially I thought I was getting 600 deg. readings. The internal gauge that came with my Tarm was way off. Thanks to Jebatty's recommendation, I checked its calibration first, and found it to be off some 200 degrees. You might want to do the same just to be sure.
 
Reminds me of my early days with the Solo 40, when I got internal flue temps pushing to 800F+. First, check the accuracy of your flue thermometer, I assume it is a probe type based on the reading. Second, it seems that you likely are burning very dry wood, which is good. That's what you want to do. Third, there is an adjustable damper on the draft fan under the top cover. Start closing that down, experiment, and see what you end up with. Fourth, add turbulators, the chain type work really well and are inexpensive, and should result in at least a 100F drop in flue temp. Last, since others already emphasized this well, brush the hx tubes regularly. I do it every two weeks; will drop temps by 50-80F or so clean vs not clean. I would say that without turburlators your goal should be no higher than 600F internal flue, and down to 500F would be very good. With turbulators, 375-425F is my normal operating range, peaks above that on initial high burn, and less for low coals.
 
Thanks for all the help. I will begin problem solving tommorrow morning when I get home from work. I am burning real dry hardwood and my typical flue temps have been less than 500 degrees. It has been about three weeks since last good tube cleaning so I will start there.
 
I had the same problems with stack temps up high. Turned out my draft was way too high. .12-15 range where Tarm recommends 0.-5 range. I have almost 29 ft of chimney and it was pulling a ton and overfiring. A check of the draft and the addition of a barometric damper has brought my temps down to 380 with good solid burns and i am still a bit high with the draft but at least its close. just my .o02 cents
 
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