MKII Limits

Modern and vintage hand fired coal stove are similar to a wood stove and in some cases can burn either. They need to be regulated and fed by hand usually every 12 to 24 hours depending on your usage. They require no power to operate making them ideal for rural settings with long power outages.
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scalabro
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Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 3:24 pm

I need more heat, I think my puny MKII is maxed out!

I don't know whether or not I'm asking to much of her but here are the facts in my situation.

2450 sq ft two story colonial built in 1995.

MKII located on somewhat open first floor on fireplace hearth.

15 feet away is a foyer with a staircase to the second floor.

We have not had the oil fired forced air furnace on for quite a while, it's set back to 55 deg.

It's 9 deg with a 3 knot wind.

2nd floor zone thermostat thermometer reads 61 deg.

1st floor zone thermostat therm reads 65 deg (other side of kitchen wall)

In the kitchen where the stove is its 76 deg.

Stove side temp with IR gun (lab calibrated) 572 deg.

Exhaust pipe at flange exit reads 347 deg (before baro)

Pipe after baro reads 106 deg.

Draft before baro set at .5 wc

Draft after baro at .8 wc

Primary air 2.5 turns open.

I am going to cut a vent in the kitchen ceiling that will end up right at the top of the staircase landing on the second floor to help promote convection upstairs.

Am I expecting too much or is about what the MKII limit is.

Cheers!

Scott

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EarthWindandFire
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Joined: Sat. Dec. 18, 2010 12:02 pm
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Other Heating: Oil Furnace and Kerosene Heaters.
Location: Connecticut

Post Sat. Dec. 14, 2013 3:49 pm

Scott,

You have a great stove, the numbers look good, how much coal have you been burning per day?
Mark

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GoodProphets
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Joined: Sat. Jan. 07, 2012 9:14 pm
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Anthra Rice
Other Heating: 3 Fireplaces
Location: Lanc Co PA
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Post Sat. Dec. 14, 2013 3:51 pm

The MKII is that rated for 72000 btu?

What is your furnace rated for?

The full output of your stove would be if it is full steam ahead,
maybe others that own it can say if it is near its rating or over/under.

2500 sqft is pretty large.

Does the furnace help with circulation?
Can you do fan only, and have you tested?

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scalabro
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Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 3:54 pm

I average 40 lbs per day, today I'll do 50 I guess.

Warmer days, say in the upper twenties or low thirties right at 40.

I know this because every night after work I have to empty a 40 lb bag in my galvanized coal bucket next to the stove.

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scalabro
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Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 3:58 pm

GoodProphets wrote:The MKII is that rated for 72000 btu?

What is your furnace rated for?

The full output of your stove would be if it is full steam ahead,
maybe others that own it can say if it is near its rating or over/under.

2500 sqft is pretty large.

Does the furnace help with circulation?
Can you do fan only, and have you tested?
I think my oil furnace is 135,000 BTU.

I have two zones with the dampers in the supply for both the first and second floor, so no my furnace squirrel cage will not run on "fan".

coalcracker
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Posts: 146
Joined: Mon. Jan. 24, 2011 6:33 pm
Hand Fed Coal Boiler: Standard sealed hot water boiler, hand fed
Hand Fed Coal Stove: Harman Mark I Magnafire
Baseburners & Antiques: Lehigh Oak 18, Washington potbelly, Sears Roebuck parlor cabinet, PIttston 6 lid cook stove, vintage combo gas/coal cook stove 4 lid
Coal Size/Type: nut
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark I Magnafire

Post Sat. Dec. 14, 2013 5:31 pm

Gekko wrote:I need more heat, I think my puny MKII is maxed out!

I don't know whether or not I'm asking to much of her but here are the facts in my situation.

2450 sq ft two story colonial built in 1995.

MKII located on somewhat open first floor on fireplace hearth.

15 feet away is a foyer with a staircase to the second floor.

We have not had the oil fired forced air furnace on for quite a while, it's set back to 55 deg.

It's 9 deg with a 3 knot wind.

2nd floor zone thermostat thermometer reads 61 deg.

1st floor zone thermostat therm reads 65 deg (other side of kitchen wall)

In the kitchen where the stove is its 76 deg.

Stove side temp with IR gun (lab calibrated) 572 deg.

Exhaust pipe at flange exit reads 347 deg (before baro)

Pipe after baro reads 106 deg.

Draft before baro set at .5 wc

Draft after baro at .8 wc

Primary air 2.5 turns open.

I am going to cut a vent in the kitchen ceiling that will end up right at the top of the staircase landing on the second floor to help promote convection upstairs.

Am I expecting too much or is about what the MKII limit is.

Cheers!

Scott
the draft knobs on those open 6-1/2 turns

how far open do you have them ?

much like a Pioneer, Marantz, Sony silver faced receiver back in the 1970's, when it's not loud enough, you turn the big knob up

in this case, turn the big knobs counterclockwise about 1/2 turn
Coal stoves without fuel, are heavy, expensive decorations. Are there any coal mines in YOUR home state ? If you talk the talk, you have to walk the walk.

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SuperBeetle
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Joined: Sat. Dec. 15, 2007 1:22 pm
Hand Fed Coal Stove: Harman Mark II
Coal Size/Type: Pea, Nut, & Stove Anthracite
Location: Gettysburg, PA

Post Sat. Dec. 14, 2013 6:41 pm

My Mark II is heating just shy of 2000 sq. ft. It keeps this place toasty. House is a split foyer with the stove in the basement. Right now it's 27 out with the draft control open 3/4 of a turn burning pea coal. The temperature in the center of the basement is 78. The temperature in the room upstairs furthest from the stove is 72. Warm air flows up the stairs which are in the center of the house. I run a ceiling fan when its extremely cold to help move the heat around upstairs. Other than that the upstairs is heated by natural convection. Your coal usage sounds about right. Are you burning nut coal? Maybe give some stove coal a try.
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dutch
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Posts: 202
Joined: Mon. Dec. 11, 2006 4:38 pm
Hot Air Coal Stoker Furnace: Alaska Channing III
Location: UPstate NY

Post Sat. Dec. 14, 2013 7:40 pm

i burned in a Mark III for 8 or 9 years, with a smaller home, so I surely
had plenty of stove for our home.

I think you are burning pretty hot, at least compared to what I used to run
as far as stack temps. but you have a larger house and I do think you need
to push that stove in very cold temps. I rarely opened 2.5 turns, but all
stove setups are different, and you stove is a tad bit smaller than my Mark III.
would you say your stove is burning hot, across the entire grate, with a full
load of coal? loaded to the top of the firebrick, with the full bed of coal
burning evenly? I did have times when the ash would start to fill the holes in
the grates, and the bed didn't burn well across the entire surface. I even used
to use some small steel tubing to poke up from the bottom of the grates to
open air passages.

i think you are on the right track trying to improve air movement, if you can find
ways to improve room to room movement of the heat you will probably
be fine with the heat the stove is putting out.
currently running a Channing III in our basement,
feeding into cold air return and circulated with
forced air furnace.
love the even warm heat!
upstate NY, near Syracuse.

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scalabro
Member
Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 8:11 pm

coalcracker wrote:
Gekko wrote:I need more heat, I think my puny MKII is maxed out!

I don't know whether or not I'm asking to much of her but here are the facts in my situation.

2450 sq ft two story colonial built in 1995.

MKII located on somewhat open first floor on fireplace hearth.

15 feet away is a foyer with a staircase to the second floor.

We have not had the oil fired forced air furnace on for quite a while, it's set back to 55 deg.

It's 9 deg with a 3 knot wind.

2nd floor zone thermostat thermometer reads 61 deg.

1st floor zone thermostat therm reads 65 deg (other side of kitchen wall)

In the kitchen where the stove is its 76 deg.

Stove side temp with IR gun (lab calibrated) 572 deg.

Exhaust pipe at flange exit reads 347 deg (before baro)

Pipe after baro reads 106 deg.

Draft before baro set at .5 wc

Draft after baro at .8 wc

Primary air 2.5 turns open.

I am going to cut a vent in the kitchen ceiling that will end up right at the top of the staircase landing on the second floor to help promote convection upstairs.

Am I expecting too much or is about what the MKII limit is.

Cheers!

Scott
the draft knobs on those open 6-1/2 turns

how far open do you have them ?

much like a Pioneer, Marantz, Sony silver faced receiver back in the 1970's, when it's not loud enough, you turn the big knob up

in this case, turn the big knobs counterclockwise about 1/2 turn
Re read my post, 2.5 turns today.

User avatar
scalabro
Member
Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 8:14 pm

SuperBeetle wrote:My Mark II is heating just shy of 2000 sq. ft. It keeps this place toasty. House is a split foyer with the stove in the basement. Right now it's 27 out with the draft control open 3/4 of a turn burning pea coal. The temperature in the center of the basement is 78. The temperature in the room upstairs furthest from the stove is 72. Warm air flows up the stairs which are in the center of the house. I run a ceiling fan when its extremely cold to help move the heat around upstairs. Other than that the upstairs is heated by natural convection. Your coal usage sounds about right. Are you burning nut coal? Maybe give some stove coal a try.
Purchased 7200 lbs of Blaschak nut, but I'll go the local Agway and buy a couple bags of stove and give it a whirl!

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scalabro
Member
Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 8:17 pm

dutch wrote:i burned in a Mark III for 8 or 9 years, with a smaller home, so I surely
had plenty of stove for our home.

I think you are burning pretty hot, at least compared to what I used to run
as far as stack temps. but you have a larger house and I do think you need
to push that stove in very cold temps. I rarely opened 2.5 turns, but all
stove setups are different, and you stove is a tad bit smaller than my Mark III.
would you say your stove is burning hot, across the entire grate, with a full
load of coal? loaded to the top of the firebrick, with the full bed of coal
burning evenly? I did have times when the ash would start to fill the holes in
the grates, and the bed didn't burn well across the entire surface. I even used
to use some small steel tubing to poke up from the bottom of the grates to
open air passages.

i think you are on the right track trying to improve air movement, if you can find
ways to improve room to room movement of the heat you will probably
be fine with the heat the stove is putting out.
The coal bed at the time was topped off and nice bright orange & blue right the way across.

I have tried to get temps past 600 but it takes a long time to get there so I run it below that figuring it's pretty much full throttle.

franco b
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Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea
Location: Kent CT

Post Sat. Dec. 14, 2013 8:27 pm

Burning 40 pounds per day I think you have a ways to go before maxing out the stove. You are only outputting about 20,000 BTU or less per hour.

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scalabro
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Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 8:33 pm

So increase the exhaust draft?

I've had the side temps @ 625 with exhaust flange temps @ 400.

Harman says it's over firing @ 500 measured at the exhaust flange or before the baro.

That's my point, is this thing flat out?

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titleist1
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Joined: Wed. Nov. 14, 2007 4:06 pm
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
Location: Cecil County, MD

Post Sat. Dec. 14, 2013 8:43 pm

have you cleaned off the fly ash from above the baffle plate? it will build up there and impede the heat transfer to the square tubing that the distribution air flows through.
I drive a VW TDI, heat my home & workshop with two coal stokers and have two vintage JD diesel tractors....
The EPA just loves me!!

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scalabro
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Posts: 2815
Joined: Wed. Oct. 03, 2012 9:53 am
Baseburners & Antiques: 2 Crawford 40's, PP Stewart No. 14, Abendroth Bros "Record 40"
Coal Size/Type: Stove / Anthracite.
Other Heating: Oil fired, forced hot air.
Location: Southwick Massachusetts

Post Sat. Dec. 14, 2013 8:46 pm

titleist1 wrote:have you cleaned off the fly ash from above the baffle plate? it will build up there and impede the heat transfer to the square tubing that the distribution air flows through.
Yup, last spring right after I burned my last bag of nut.

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