One concern I have with Central Boiler is the rumored stack temperature on the E-Classic being between 450 and 600 or possibly higher. Have any of the CB owners measured the temp? I called the factory and the sales rep claimed he did not know. My initial thoughts were that he refused to tell me. He did a pretty good job of playing dumb, but I smell shenanigans. One other thing I'm not a big fan of, is the low gassification chamber temps. (800 to 1200f)
CB E-Classic Stack Temp
- Thread starter Mass Heat
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RobC
Minister of Fire
Welcome, I know some of the towns around here are starting to ban OWB. I realize that some of these (CB's) are secondary burn OWB's but still do smoke while cycling. From the CB web site they they start at 9K, plus thermopex and the rest of installation ?
Why not look at a gassifier and storage. If you want it out side you could put it in a shed and still pex it underground. Your efficiency will go up, greatly reduced smoke and you could get DHW for the summer.
Why not look at a gassifier and storage. If you want it out side you could put it in a shed and still pex it underground. Your efficiency will go up, greatly reduced smoke and you could get DHW for the summer.
stee6043
Minister of Fire
Mass Heat said:
I bet the dealer was being honest when he said he didn't know. I suspect publsihing any meaningful stack temps for an OWB is extremely difficult due to the way they are intended to operate. Are you looking for an average stack temp? Or peak operation stack temp? The E-Classic has such a massive firebox that it will likely idle more than it runs. In this case, your stack temps could be a couple hundred degrees for much of the burn.
What is your concern with 450-600+ degrees? A properly designed and installed chimney should handle significantly more than 1200F. I believe Class A (103HT) will perform up to 2100 F.
muncybob
Minister of Fire
It would concern me also if the actual manufacturer could not answer a question or at least say I'll get back to you. That question is not that difficult to answer if they know their product.
My boiler will run temps within a cerrtain range most of the time but I have seen stack temps considerably higher, for me it dpeneds on the wood I was burning at the time. So, they could have at least told you that the average range is between this and that...right?
My boiler will run temps within a cerrtain range most of the time but I have seen stack temps considerably higher, for me it dpeneds on the wood I was burning at the time. So, they could have at least told you that the average range is between this and that...right?
heaterman
Minister of Fire
Mass Heat said:
This was one of the main pieces of info presented to EPA (speaking of flue temps here) that convinced them that the efficiency ratings being reported under their test parameters were totally bogus. It defies the laws of physics to assert that your boiler is 85%+ efficient with stack temps above 400*. Simply can't be done. Not now, not ever. Doesn't happen in a gas fired boiler much less a wood fired unit.
I would really get a kick out of someone getting CB or any of the OWB type gassers to publish their flue gas temps while firing under normal operation. Probably pay money to see it.
Forgive me if I sound a tad cynical but I'm tired of this industry shooting itself in the foot with false and misleading claims.
martyinmi
Member
Heaterman,
The only thing that I have heard where the CB brand of gassers are concerned is what I've been told by a few dealers. They maintain that their stack temperatures run between 290* and 400*. That may be hearsay, I don't know for sure. Based on stack temperatures I've monitored on my P&M 250, they can't be that far off. I've installed a Love controller(TCS-4010) and a J thermocouple to monitor exhaust temperatures, and the range that mine consistently runs within(with turbulators installed) is between 260* and 400*. Temperatures will be 10*- 40* higher with them removed. 3 of the 4 CB gassers tested had better efficiencies than mine. 3 of 4 also emitted less particulate matter.
PM me and we can set up a time where you can watch mine in operation some time. Feel free to bring your combustion analyzer, as I have holes already drilled for additional probes.
Mass Heat,
Based on what I've learned with mine this winter, I doubt you'll ever see a 600* degree stack temperature with a CB gasser. I think a 450* average stack temperature would only be prevalent in the event the unit went for a lengthy period between cleanings, or if unseasoned fuel(wet) were burned and the heat exchange area became coated with creosote, thus acting as an insulator and preventing proper thermal transfer.
Moisture content tends to dictate exhaust temperature as much or more than anything else. My temperatures will run higher with dryer wood(under 16%).
The only thing that I have heard where the CB brand of gassers are concerned is what I've been told by a few dealers. They maintain that their stack temperatures run between 290* and 400*. That may be hearsay, I don't know for sure. Based on stack temperatures I've monitored on my P&M 250, they can't be that far off. I've installed a Love controller(TCS-4010) and a J thermocouple to monitor exhaust temperatures, and the range that mine consistently runs within(with turbulators installed) is between 260* and 400*. Temperatures will be 10*- 40* higher with them removed. 3 of the 4 CB gassers tested had better efficiencies than mine. 3 of 4 also emitted less particulate matter.
PM me and we can set up a time where you can watch mine in operation some time. Feel free to bring your combustion analyzer, as I have holes already drilled for additional probes.
Mass Heat,
Based on what I've learned with mine this winter, I doubt you'll ever see a 600* degree stack temperature with a CB gasser. I think a 450* average stack temperature would only be prevalent in the event the unit went for a lengthy period between cleanings, or if unseasoned fuel(wet) were burned and the heat exchange area became coated with creosote, thus acting as an insulator and preventing proper thermal transfer.
Moisture content tends to dictate exhaust temperature as much or more than anything else. My temperatures will run higher with dryer wood(under 16%).
heaterman
Minister of Fire
martyinmi said:
If stack temps are in that range that's not too shabby.
Are you referring to the EPA test?
martyinmi
Member
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