Heating with wood in coal stove?

Re: Heating with wood in coal stove?

PostBy: titleist1 On: Wed Nov 16, 2011 8:57 am

If you happen to have an insulated chimney rather than masonry I think it helps prevent the creosote buildup. The flue gases don't cool as much. In all the years we burned wood along with coal, we never had any kind of creosote in the chimney. I burned a lot of pine and pallet wood along with the oak, maple and poplar. Also our chimney only has to clear a ranch house and isn't going 35' to clear a 3 story home so the exhaust isn't in the chimney very long which means less time to cool down.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Heating with wood in coal stove?

PostBy: Rob R. On: Wed Nov 16, 2011 9:11 am

It is all about maintaining a sufficient stack temperature to prevent the gasses from condensing in the flue. If you must burn wood in a coal stove, leave some coal ash on the grates to protect them and keep the fires short and hot.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice/buck
Other Heating: Dad's 1953 EFM Highboy

Re: Heating with wood in coal stove?

PostBy: poopystain On: Wed Nov 16, 2011 9:22 pm

I've been burning some wood in my HMK 2 and I'll tell you what, get your underpants ready cause it gets hot as heck, quick. It rips through wood however.
poopystain
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark II

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Re: Heating with wood in coal stove?

PostBy: Uglysquirrel On: Wed Nov 16, 2011 9:36 pm

Mark II, ran thru wood fast, took high temp bricks and put them on the grates really close together . Seemed to slow down the burn though I was somewhat concerned about the long term effects (cracking?) of exposing the cast grate to hot and cold spots along their lenghts...

Never did get a lot of consistent heat out plus pretty much every time the top door was opened, smoke came out.

Failed experiment.
Uglysquirrel
 
Stove/Furnace Model: Pocono

Re: Heating with wood in coal stove?

PostBy: Mountinpie On: Sun Nov 10, 2013 8:41 am

Recently purchased a used Mark III coal stove for a new home, masonry chimney never used. The crock coming through the wall is 8". My plan is to install the Mark III in our basement with 6" stove pipe and manual damper then use a thimble for connection to the crock. Any problems burning wood in this thing for a few years until I switch to coal? Reason being...I purchased several cords of wood summer of 2012 and would like to use it a bit during colder months as a supplement to our geothermal. Once I install a coal bin and barometric damper, i'll burn coal. Any thoughts? Thanks.
Mountinpie
 

Re: Heating with wood in coal stove?

PostBy: titleist1 On: Sun Nov 10, 2013 8:55 am

i used a Mark III for about 18 years burning a mix of wood and coal at different times. It will go through the wood faster than a dedicated wood stove. you really need to cut down on the ash door air. you may even need a manual damper to keep some heat in the stove, depends on your stove / chimney draft situation. the one downside is there is no way to control over the fire air since the source is the air wash gap at the top and bottom of the door glass.

the wood was a good fit for us in the shoulder months where a once a day fire to take the chill off is what was needed. we had cleared many trees on our property so it was convenient to use them up and served as good exercise.

Get a manometer and connect it so you can manipulate the air and damper (if installed) to an actual draft number rather than a guess.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Heating with wood in coal stove?

PostBy: Sprinklesplz On: Sun Jan 26, 2014 3:31 pm

We have a Gibraltar SCC and we've switched back and forth a bit between coal and wood this winter. We recently bought this house so everything with the stove has been a learning experience. Love the coal but unfortunately, we don't yet have anywhere to store a large amount, so we've gone through the few bags we picked up quickly. Been keeping wood on hand as well. Once the fire gets going, it's gotten quite warm and heats a few rooms nicely. Does burn quick and too hot, though, if it's not carefully watched. Once it's going I find that leaving the secondary draft open just a bit is enough to keep it going, but not out of hand. Just cleaned down to the grates to get a few old pieces of coal out, but I think I'll shovel a little ash on the grates before I start today's wood fire.
Sprinklesplz
 
Hand Fed Coal Stove: Gibraltar
Coal Size/Type: Anthracite
Other Heating: 1953 forced hot air furnace

Re: Heating with wood in coal stove?

PostBy: dlj On: Sun Jan 26, 2014 5:15 pm

I'm trying to remember the details of burning wood in my coal stove when I used to do that years ago. Not sure I remember everything, but here goes with what I can. First, wood likes to burn in a nice bed of fluffy ash, unlike coal. So when burning on top of coal grates, I'd let a nice bed of ash get laid down (unless I wanted a really hot fire). Then I'd run mostly the top door air feed (secondary air) to control the fire. I would only shake the grates when the ash bed would get hard - I don't remember - maybe like once a week or even less often. For my stove I used to cut short pieces of wood, only 10 to 12 inches long. They would lay nicely cross ways and I could fill up to the top of the stove. Once I had a nice fire going, I'd fill the stove all the way to the top, even taking off the top piece and stuffing in more wood from the top plate down. That's if I was going to bed or off to work. When hanging around the house, I'd just throw wood in and keep the fire nice all the time. I used to like that. Now I like forgetting about the fire and just being warm...

dj
dlj
 
Hand Fed Coal Stove: Vermont Castings Resolute
Baseburners & Antiques: Glenwood Baseheater #6
Coal Size/Type: Stove coal
Other Heating: Oil Furnace, electric space heaters

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