DS Kozy-King

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69mustang
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Post by 69mustang » Wed. Aug. 12, 2015 5:37 pm

I am looking for a bi-fuel forced air furnace. I am young and enjoy cutting firewood yet, but am planning to burn some anthracite. How do these models burn wood and anthracite? I am fearful that they may eat wood with the forced induction. What is the reasoning for forced induction vs natural draft? I have heard many time that wood/coal stoves are usually better at burning one fuel than the other. Anyone have any input?

Thanks!

 
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Lightning
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Post by Lightning » Wed. Aug. 12, 2015 10:24 pm

Welcome to the board! You have some challenging questions there. This thread may get pretty interesting. Yes it's true that multi fuel appliances tend to lack efficiency from one fuel to another. The differences between wood and coal are mainly the ratios of primary and secondary air. For efficient burning, wood needs a huge amount of secondary air (combustion air that passes over the fuel) as compared to coal. Coal needs it's combustion air mostly to come in underneath and to go up thru the fuel bed (primary air). It's these differences between the two fuel requirements that make it difficult for one appliance to burn both at their best efficiency.

I've never used a draft induction unit that pumps combustion air into the fire box. It actually could be dangerous if the fire box pressure goes positive. It can result in carbon monoxide venting into the stove room. I would never operate one without a manometer (an instrument that measures draft pressure) installed.

 
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SWPaDon
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Post by SWPaDon » Wed. Aug. 12, 2015 10:34 pm

Welcome to the forum.

There are a lot of threads on this site about the Kozy King. Just type those two words in the search box at the top right for lot's of reading material. They seem to be a good coal burning furnace.


 
coalfan
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Post by coalfan » Thu. Aug. 13, 2015 7:23 am

i think member ld Posse has one though he hasnt been on lately I recall he liked his unit .

 
69mustang
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Post by 69mustang » Fri. Aug. 14, 2015 5:21 pm

I know I am on a coal forum..... but I was hoping somebody at burned wood in them...

 
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coaledsweat
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Post by coaledsweat » Fri. Aug. 14, 2015 5:32 pm

The forced draft is much more responsive than a natural draft. Coal is a little grumpy and is slow to respond, the blower fixes that. I actually did some draft testing with my old hand fired to see what changes the blower made. Only with the MPD closed up did I see positive pressure in the firebox. It lasted seconds and returned to normal. You just need a good chimney and the coal will do the work.


 
69mustang
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Post by 69mustang » Sat. Aug. 15, 2015 10:45 am

One thing I don't understand on the Kozy King is that the draft blower supplies the firebox with both primary combustion air and the secondary air. This is different from what I am used to seeing. Most stoves have an automatic damper for the primary combustion, while the secondaries have their own system that pulls air from the room at will. Does any one have any insight on this?

Thanks!

 
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LDPosse
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Post by LDPosse » Wed. Aug. 19, 2015 9:45 pm

I have burned a little wood, but mainly coal.

The Kozy King has a handle that you push in/pull out depending on whether you are burning wood or coal. When in the coal position, a majority of the air from the blower comes in as primary air, and vice versa in the wood position.

The stove seems to burn wood fairly well, and a load of wood lasts longer than I would have expected, but nowhere near the burn times of coal. From what I could tell, I would not expect burn times with wood to exceed 6-8 hours, and still have enough hot coals to just toss more wood in and keep going.

Burn times with coal are 12+ hours in the winter and 24-48 hours during the shoulder months.

Having used the DS1500 with hopper previously, I would say that the Kozy King is not as easy to use, and the fire recovery time after reloading is not as quick, but it got the job done this past winter. We saw -11F here on the farm this past winter, and the Kozy King did not disappoint.

 
69mustang
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Post by 69mustang » Thu. Aug. 20, 2015 11:08 pm

LD Posse,
How many sq ft are you heating with the 100-14?

 
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LDPosse
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Post by LDPosse » Tue. Aug. 25, 2015 12:16 pm

About 1300 sf of un-insulated farmhouse. 1/2 log construction and 1/2 framed. You can feel a cold breeze indoors when the wind blows.

I'm glad I didnt go any larger, or we would have bern cooked outof the house on mild days.

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