Markiii Blower on a Mark II Stove

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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coal-cooker
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Posts: 128
Joined: Sat. Feb. 23, 2008 12:18 pm
Stove/Furnace Make: Crane/Harman
Stove/Furnace Model: Coal Cooker/Mark II
Location: Coopers Mills, ME

Post Mon. Nov. 24, 2008 9:14 am

Has anyone ever put a blower from a Harman Mark III on a Mark II stove? Does anyone know if they are interchangable? I would like to get more air flow through my stove and thought this might be the quickest way to go.
Justin S.

Burning anthracite nut & pea coal in an old Crane Coal-Cooker since 1985.

There is nothing like a bin full of coal to give you that warm fuzzy feeling. OH, I forgot to mention the fridge full of beer.

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LsFarm
Member
Posts: 7385
Joined: Sun. Nov. 20, 2005 8:02 pm
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland
Location: Michigan

Post Mon. Nov. 24, 2008 9:31 am

Be aware that speeding up the airflow through the air jackets on your Mark II may actually produce cooler air.. the air needs to have time in the heat jacket to warm up..

That said, I'd go to the Harman site and compare CFM ratings of the blowers.. and then I'd remove your blower, take photos with a measuring tape showing the size of the mounting flange,, post the photos here, and ask for a comparrison to a Mark III mounting flange..

You might also do a search for the model number on your fan on Google and see if you can find a wholesale supplier for your blower, then call then for a slightly larger CFM model.

If you do install a higher CFM blower, I'd recommend installing it with a reostat so you can slow it down if it blows too hard and fast,, producing cooler air instead of more hot air..

Hope this helps..

Greg L
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

User avatar
coal-cooker
Member
Posts: 128
Joined: Sat. Feb. 23, 2008 12:18 pm
Stove/Furnace Make: Crane/Harman
Stove/Furnace Model: Coal Cooker/Mark II
Location: Coopers Mills, ME

Post Tue. Nov. 25, 2008 1:19 pm

Thanks Greg. I thought I had read at one point on here about someone swapping them, but I can not find it now. I'll keep searching. I may also take my measurements over to the Harman shop and see if I can compare them.
Justin S.

Burning anthracite nut & pea coal in an old Crane Coal-Cooker since 1985.

There is nothing like a bin full of coal to give you that warm fuzzy feeling. OH, I forgot to mention the fridge full of beer.

Visit Hitzer Stoves

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coal berner
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Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Tue. Nov. 25, 2008 1:49 pm

Coal cooker Like Greg said to many CFM on a bigger fan will make cooler air. It take the hot air and turns it to cool air. The mark I & II comes with a 76 cfm blower The Mark III comes with a 135 cfm blower in this case bigger is not better. If you do use a Fan speed control you Probably will be
running the blower fan at the same speed as the one that you have now. To keep the hot air
if you run the bigger fan on med or high you will be cooling the air to much save your money.
These Fans are setup from the factory to match the stove's heat output . Maybe you could get away with a 90 or a 100 cmf blower fan but I think that would be about it.
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

sharkman8810
Member
Posts: 359
Joined: Wed. Mar. 05, 2008 7:27 pm
Hand Fed Coal Stove: hitzer 82 ul
Coal Size/Type: nut
Stove/Furnace Make: hitzer
Stove/Furnace Model: 82 u.l.
Location: south central pa

Post Tue. Nov. 25, 2008 8:36 pm

They do seem small, I have a heat collector around my hitzer and about 4' up the 8" duct from the stove I have about a 500 cfm fan pulling air off of the stove, and the temp of the air is about 170* when the stove is at 350*.

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coal berner
Member
Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Wed. Nov. 26, 2008 12:23 am

coal-cooker wrote:Thanks Greg. I thought I had read at one point on here about someone swapping them, but I can not find it now. I'll keep searching. I may also take my measurements over to the Harman shop and see if I can compare them.
Try this Place if you want to upgrade your blower fan But don't go to big from what you have

http://www.electricmotorwarehouse.com/fasco/fasco_blower.htm
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

Visit Hitzer Stoves

User avatar
coal berner
Member
Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Wed. Nov. 26, 2008 12:35 am

sharkman8810 wrote:They do seem small, I have a heat collector around my hitzer and about 4' up the 8" duct from the stove I have about a 500 cfm fan pulling air off of the stove, and the temp of the air is about 170* when the stove is at 350*.
Yes but your Hitzer 82 ul stove is twice the size of a Mark I or II you have alot more heat coming
off of that stove 3.7 Cu Ft. firebox 92.000 BTU's ;) Harman Mark I 48.000K Mark II 72.000K
Mark III 92.000K which has a 135 cfm blower The SF 250 is 120.000K It has a 135 cfm blower
I am not saying you can't pt a higher cfm blower on his stove but you have to make sure you
do not exceed the heat output of the stove or all you will do is make hot air into cool air

http://www.hitzer.com/model82.html

http://www.harmanstoves.com/specifications.asp?id=13
**Broken Link(s) Removed**http://www.harmanstoves.com/specifications.asp?id=15

**Broken Link(s) Removed**
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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EasyRay
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Posts: 468
Joined: Thu. Nov. 16, 2006 8:44 pm
Hand Fed Coal Stove: Harman TLC 2000
Coal Size/Type: Pea,Nut or Stove
Location: Central Connecticut

Post Wed. Nov. 26, 2008 9:49 am

I don't know how Harman figures out what size blowers go on which stove. My TLC 2000 is rated at 72,000 BTU and it comes with a 135 CFM variable speed blower.
It must be the design of the stove because my stove has a jacket on three sides but just uses the rear jacket to blow air through and a much larger area blowing and moving the air off the back and top of my stove.
I think the MK II has only one little hole on each side of the top of the stove for the air to exit from.

The kettle in the picture is blocking the view of the vent on the other side but you get the general idea.
Attachments
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Regards, Ray

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