Safe Operating Temp. Hotblast Stove

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ncpajohn
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Joined: Fri. Feb. 27, 2015 10:42 pm
Hot Air Coal Stoker Furnace: Alaska model 140
Hand Fed Coal Furnace: U.S.S.C. Model 1557M
Coal Size/Type: Anthracite / Nut
Other Heating: Nat Gas

Post by ncpajohn » Tue. Mar. 17, 2015 1:22 pm

Hello Everyone, Happy Saint Patrick's day to all.
As Coal burns much hotter than wood I have had my stove up to 500* even 600*, 650 - 700 * with coal to keep the house warm on really cold days.
I am concerned about safely using my stove, Hotblast 1557-M. Since I just started using coal, It is obvious that it burns hotter than wood.
I called USSC to ask about maximum firebox operating temp. and was told by the " Technician " Lady who answered the phone that it was 400* !!!! :roll: :roll: :shock: She even asked her supervisor... To me that sounds low. Does anyone here have a more realistic number. ??
Thanks in advance. :D :)
That is temperature with a magnetic burn indicator on the firebox next to the top right corner of the feed door.
Last edited by ncpajohn on Sat. Apr. 01, 2017 8:59 am, edited 3 times in total.
Reason: Moved to Hand Fired Coal Stoves

 
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warminmn
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Location: Land of 11,842 lakes
Hand Fed Coal Stove: Chubby Junior, Efel Nestor Martin, Riteway 37
Coal Size/Type: nut and stove anthracite, lignite
Other Heating: Wood and wear a wool shirt

Post by warminmn » Tue. Mar. 17, 2015 2:49 pm

If you can only burn it to 400, there wouldnt be much use for one. I think they are just covering themselves from liabilities. Theres going to be a temp you will hit where your coal consumption really jumps. Stay below that temp if possible because that is likely the point of overfiring your stove. But Im pretty sure you can run it 500 all day and maybe 600. Over that, other than short spells of time, Im not sure. It will start turning red somewhere around 900 on a thermometer, depending on how accurate your thermometer is. If you are using a magnetic thermometer it will fall off the stove about then. Dont ever get it that hot. Im sure others will chime in too.

 
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Ky Speedracer
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Posts: 492
Joined: Sun. Dec. 21, 2014 9:38 pm
Location: Middletown, Kentucky
Hand Fed Coal Stove: Florence HotBlast NO.68 & Potbelly
Hand Fed Coal Furnace: HotBlast 1557M
Coal Size/Type: Ky Lump & Anthracite Nut
Other Heating: Oil

Post by Ky Speedracer » Tue. Mar. 17, 2015 2:56 pm

Can't speak to the manufacturer's specs as I've never seen them published anywhere. But, I can tell you that mine usually spends a couple of hours over 500* when I first get her stoked up. It's been over 800* a couple of times when I let the primary air go for to long.
I've been over it with a fine tooth comb while I was cleaning it up last week and It doesn't show any signs of over-fire like warped baffles or scorch marks. All the gaskets seem good and tight as well.

I typically try to keep it between 500* and 600* during the initial burn.


 
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hotblast1357
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Location: Peasleeville NY
Stoker Coal Boiler: 1984 Eshland S260 coal gun
Coal Size/Type: Lehigh anthracite pea
Other Heating: air source heat pump, oil furnace

Post by hotblast1357 » Tue. Mar. 17, 2015 7:20 pm

My normal burn temps for winter are between 300-500, fall and spring between 140-300, during the coldest of winter it will hit 600 a couple times for a little while, I wouldn't have any fear of running it at 500-550 all day every day, I just don't need too.

 
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Lightning
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Location: Olean, NY
Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Tue. Mar. 17, 2015 7:58 pm

During extreme cold mine will run about 375-425 over the load door. Right now its running 280 and cooking us out of the house lol... 77 in here, 30 outside. I only had mine over 500 once, using bituminous coal..

 
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ncpajohn
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Posts: 47
Joined: Fri. Feb. 27, 2015 10:42 pm
Hot Air Coal Stoker Furnace: Alaska model 140
Hand Fed Coal Furnace: U.S.S.C. Model 1557M
Coal Size/Type: Anthracite / Nut
Other Heating: Nat Gas

Post by ncpajohn » Wed. Mar. 18, 2015 11:30 am

Surprise. !! USSC engineer called me back and this is what he said..

Per United States Stove Company. Engineer, 1557-M firebox maximum operating temperature, with magnetic thermostat on stove front attached to firebox next to upper right hand corner of load door. = 1,000* ( They test them hotter than that. ) is ok and not to exceed 600* in stovepipe and take Manometer reading at 18" from stove collar. :D


 
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Lightning
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Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Wed. Mar. 18, 2015 11:36 am

Perfect. Thanks for reporting. That's good information!

 
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Ky Speedracer
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Posts: 492
Joined: Sun. Dec. 21, 2014 9:38 pm
Location: Middletown, Kentucky
Hand Fed Coal Stove: Florence HotBlast NO.68 & Potbelly
Hand Fed Coal Furnace: HotBlast 1557M
Coal Size/Type: Ky Lump & Anthracite Nut
Other Heating: Oil

Post by Ky Speedracer » Wed. Mar. 18, 2015 11:46 am

Nice. That's good info to know.
When mine got up just over 800* the air from the supply duct about 5' from the stove was over 200*. I can't imagine how hot it would have been if it was burning at a 1000*.
I don't intend to find out...

 
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SWPaDon
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Location: Southwest Pa.
Hand Fed Coal Furnace: Clayton 1600M
Coal Size/Type: Bituminous
Other Heating: Oil furnace

Post by SWPaDon » Wed. Mar. 18, 2015 4:29 pm

I don't have a thermometer on mine, but I've had mine glowing more than once. I've gotten cracked firebrick(even without the glowing) and the front liner cracked, but other than that nothing is warped.

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