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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CoalHeat
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Posts: 8327
Joined: Sat. Feb. 10, 2007 9:48 pm
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Baseburners & Antiques: Sears Signal Oak 15 & Andes Kitchen Range
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert
Location: Stillwater, New Jersey

Post Sat. Dec. 14, 2013 10:48 pm

franco b wrote:Measuring the draft directly opposite the baro might not give a correct reading. There is not enough room between the stove and baro to get a reading before the baro. If it is true that reading before or after should be the same then you have been running at .08 and not .05 because the higher reading is far enough away from the baro to read true.

If this is so it could explain your problem.
I thought of that as well, and reread the Field Controls manual for the damper to try and find out how close to the appliance the control should be installed. The instructions only indicate "as close as possible".
http://www.fieldcontrols.com/pdfs/02702600.pdf
Heating a circa 1832 farmhouse with a Harman Magnafire Mark I & a 1959 EFM 350 (heating DHW).
100% Oil Free!
"It's what we learn after we think we know it all that counts."

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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 10:53 pm

franco b wrote:Measuring the draft directly opposite the baro might not give a correct reading. There is not enough room between the stove and baro to get a reading before the baro. If it is true that reading before or after should be the same then you have been running at .08 and not .05 because the higher reading is far enough away from the baro to read true.

If this is so it could explain your problem.
Nah ...you can't see from the pics but I have a spot on the other side before that gives a good reading.

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oliver power
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Posts: 2266
Joined: Sun. Apr. 16, 2006 9:28 am
Stoker Coal Boiler: KEYSTOKER Kaa-2
Hand Fed Coal Stove: Hitzer 50-93 & 30-95, Vigilant (pre-Vigilant-II), D.S. 1600 Circulator
Baseburners & Antiques: MANY (Mostly when burning wood)
Location: Near Dansville, NY

Post Sat. Dec. 14, 2013 11:19 pm

The stove is a little on the small side for your square footage. It's bitter cold out side. Let the furnace help out a little. The air is preheated. The furnace won't run long. You'll be very comfortable. You may like it so much, you'll leave the furnace help out all the time. Oliver

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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 11:29 pm

oliver power wrote:The stove is a little on the small side for your square footage. It's bitter cold out side. Let the furnace help out a little. The air is preheated. The furnace won't run long. You'll be very comfortable. You may like it so much, you'll leave the furnace help out all the time. Oliver
Thanks Oliver, we did do that today and the Saudi powered unit only had to run a few minutes.

I'm making it my mission though to not fund Muslim terrorists!

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Lightning
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Posts: 8301
Joined: Wed. Nov. 16, 2011 9:51 am
Hand Fed Coal Furnace: Overmodified/Bored out Clayton 1537
Coal Size/Type: Anthracite/Awesome Size
Location: Olean, NY

Post Sun. Dec. 15, 2013 6:30 am

franco b wrote:Measuring the draft directly opposite the baro might not give a correct reading. There is not enough room between the stove and baro to get a reading before the baro. If it is true that reading before or after should be the same then you have been running at .08 and not .05 because the higher reading is far enough away from the baro to read true.

If this is so it could explain your problem.
Yes. I agree :D

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Lightning
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Posts: 8301
Joined: Wed. Nov. 16, 2011 9:51 am
Hand Fed Coal Furnace: Overmodified/Bored out Clayton 1537
Coal Size/Type: Anthracite/Awesome Size
Location: Olean, NY

Post Sun. Dec. 15, 2013 6:42 am

Wood'nCoal wrote:I think you can open up the under fire air a little more and try to get the draft in the pipe before the baro a little closer to -.04" WC. , that's about it.
I agree with this too. :D

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 Sun. Dec. 15, 2013 7:05 am

oliver power wrote:The stove is a little on the small side for your square footage. It's bitter cold out side. Let the furnace help out a little. The air is preheated. The furnace won't run long. You'll be very comfortable. You may like it so much, you'll leave the furnace help out all the time. Oliver
that's what I posted but it was taken down. The Mark II is rated at 72k BTU for 1900 square feet.

FWIW, Harman dropped the Mark II and only make/sell the Mark I and Mark III now.

A good match would be a Mark III or a Magnafire SF, the latter will do 5000 square feet, and puts out 120k btu.
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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lsayre
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Posts: 12247
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sun. Dec. 15, 2013 7:09 am

What are the internal firebox dimensions (firebrick to firebrick) of the Harman MKI, MKII, and MKIII?

For comparison, DS Machine's largest sized Circulator stoves BTU's appear to be related to firebox length and width as follows:

L x W x 375 = BTU's
Last edited by lsayre on Sun. Dec. 15, 2013 7:23 am, edited 1 time in total.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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coalcracker
Member
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 Sun. Dec. 15, 2013 7:23 am

lsayre wrote:What are the firebox dimensions of the Harman MKI, MKII, and MKIII?

For comparison, DS Machine's stove BTU's appear to be related to firebox length and width as follows:

L x W x 375 = BTU's
You hit the nail there, it all comes down to firebox size, there's only so much BTU's in any given fuel.
The Magnafire SG is on Harman's site listed at the "highest BTU coal stove on the market"- by that they must mean hand fed free standing, because there are stokers higher rated than that- don't know if that's true anymore, but it's rated at 120k btu, and will heat up to 5000 square feet. 120k BTU is more than a furnace, that's a big hand fed stove. Here's the info from their site.

Model Specifications
MAGNAFIRE SF
Front Width: 20-1/2
Height: 43
Depth: 35-1/2
Viewing Area: 8-1/2 x 4-1/2
BTU/Hour Input: 120,000
Heating Capacity*: 1,900 - 5,000 sq ft.
Magnafire SF Coal Stove
The Magnafire SF-250 Coal Stove is a true workhorse. It’s loaded with features to help you squeeze the most out of your fuel. An optional heat collector works to send hot air out into hard-to-heat places—or lets you tie into an existing system.
•120,000 BTUs — heats 1,900 to 5,000 square feet, based on climate and home efficiency
•Up to 24 hours of burn time on one load of coal
•Harman Grate System extends heating by completely burning coal to fine ash
•Highest BTU coal stove on the market

here's the Mark III
Model Specifications
MAGNAFIRE MARK III
Front Width: 25
Height: 32-1/2
Depth: 24
Glass Size: 14-15/16 x 8-1/2
BTU/Hour Input: 92,000
Heating Capacity*: 1,900 - 4,900 sq ft.
Last edited by coalcracker on Sun. Dec. 15, 2013 7:27 am, edited 2 times in total.
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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lsayre
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Posts: 12247
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sun. Dec. 15, 2013 7:25 am

coalcracker wrote:•Highest BTU coal stove on the market
But what are its internal firebox dimensions?
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Cap
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Posts: 1581
Joined: Fri. Dec. 02, 2005 10:36 pm
Hand Fed Coal Stove: Harman SF 250, domestic hot water loop, heat accumulator
Coal Size/Type: Nut and Stove
Other Heating: Heat Pumps
Location: Lehigh Twp, PA
Contact:

Post Sun. Dec. 15, 2013 10:46 am

SF 250 is 13" wide at the grates. My unit is divided in half. So it is 13"x 12". Actual depth about 24".
Attachments
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SF 250 reduced 50% heating 2400sf plus full basement
Cap
Lehigh Twp.
Northampton Co., PA

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