Harman Mark II

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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jrplumber87
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Posts: 4
Joined: Tue. Nov. 08, 2011 6:15 pm
Stove/Furnace Make: alaska
Stove/Furnace Model: channing 2
Location: Apalachin, NY

Post Fri. Aug. 09, 2013 6:57 pm

Hello all! Awhile back I posted a question about the Reading Swatara. I never received a response and long story short I never bought the stove. However, after last winter (cold here in NY) I need to get off my butt and settle on a stove. I have one question about the Harman Mark II. If anyone out there has one, what is the average unattended burn time you are getting out of it. By unattended I mean no shaking, filling, or poking. They advertise 24 hour unattended burn but the real world is different. This stove would be the perfect size for my 1300sq ft house. The only reason I ask this is I am a heating technician and sometimes I get home a few hours late in the winter and I don't want to come home to a cold stove and the sound of my propane furnace running if I can help it. Thanks for your time! I would appreciate any insight anyone has.

Anthracite Ed
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Posts: 43
Joined: Mon. Feb. 18, 2013 5:37 pm
Hot Air Coal Stoker Stove: Alaska Channing III
Hand Fed Coal Stove: Harman Mark II
Coal Size/Type: UAE Classic Deep Mined
Other Heating: Electric Heat Pump
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark II
Location: Harrisburg Pa

Post Fri. Aug. 09, 2013 7:09 pm

Greetings , I have been burning a mark II for about 12 years in central penna, in the dead of winter I get about 8-10 hours unattended,

jrplumber87
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Posts: 4
Joined: Tue. Nov. 08, 2011 6:15 pm
Stove/Furnace Make: alaska
Stove/Furnace Model: channing 2
Location: Apalachin, NY

Post Fri. Aug. 09, 2013 8:18 pm

Thank you! Not as long as I expected for burn time but your info is valuable! Thank you for your time. I'm sure experimenting with pea and nut mix and adjusting air intake could extend these burn times. If anyone has more input please chime in. Thanks!

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jpete
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Posts: 10580
Joined: Thu. Nov. 22, 2007 9:52 am
Hand Fed Coal Stove: Harman Mk II
Coal Size/Type: Stove, Nut, Pea
Other Heating: Dino juice
Location: Warwick, RI

Post Fri. Aug. 09, 2013 8:24 pm

I had a Mk I and now have a Mk II.

I typically tend mine twice a day. If I'm running it hard, maybe 3.

Normal routine is tend it in the morning before work. ~6:30am

Hit it again anytime after work between 4pm and 7pm.

Then maybe a quick shake and top off the fire box before bed at ~11pm.

That's not to say the stove "needed" to be tended. Those are just easy times for me. I went 22hrs on my Mk I once but I don't think I'd try that every day.

And for the record, I normally burn nut in the early and late seasons and stove in the dead of winter.
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Chuck_Steak
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Joined: Wed. Jan. 06, 2010 9:03 pm
Coal Size/Type: mostly nut, sometimes stove, Santa brand
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark III
Location: New Hampster

Post Sat. Aug. 10, 2013 10:27 am

As a heating tech, you know it is strictly a math proposition..
24 hour burn does work.
If it's cool outside, and you need to take the chill off.
If it's zero outside and windy, you may only get 8-10.
All depends on temp differential, and how warm you want to be..

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JohnB
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Posts: 434
Joined: Sat. Jul. 06, 2013 6:06 pm
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Mostly nut, some pea
Location: Northeastern Ct.

Post Sat. Aug. 10, 2013 6:49 pm

You might want to also consider the Hitzer 30-93. The 30lb gravity feed hopper would give you longer burn times.

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SMITTY
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Joined: Sun. Dec. 11, 2005 12:43 pm
Stoker Coal Boiler: Patriot Coal - (custom built by Jim Dorsey, Taunton MA - RIP 4/18/13)
Hand Fed Coal Stove: Harman Mark III (SOLD!)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler
Location: West-Central Mass

Post Sun. Aug. 11, 2013 12:50 am

I used to get 10 -15 hour burn times until I switched brands of coal. Kimmels to Blaschak.

My Mark III will easily go over 24 hours during the not-so-cold part of the fall. During a sub-zero January night, that gets knocked back to about 18 or so.

Sure, I could refresh it every 12 .. but why? It's enough work as it is. Besides, if it's still burning hot, refreshing is a waste, IMO.
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Lightning
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Posts: 8300
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. Aug. 11, 2013 3:56 am

jrplumber87 wrote:The only reason I ask this is I am a heating technician and sometimes I get home a few hours late in the winter and I don't want to come home to a cold stove and the sound of my propane furnace running if I can help it. Thanks for your time! I would appreciate any insight anyone has.
I don't have a mark II or a "stove" for that matter but hopefully this may help. I have a hand fed furnace much tended to the same way as a stove would be. My opinion is that an appliance properly sized for the space should get 12 hour tending times minimum thru a majority of the winter. Occasionally when its below normal cold, tending 3 times a day may be required to maintain a steady high heat output. That's why we love coal right? To get burn times that don't make us a slave to the heat 8-) SO, it would be wise to figure out how many BTUs you average use thru an average winter day and take it from there. It may take some math work to figure out your BTU needs based on propane usage. Since yer a heating technician the following should be right up your ally :) I had a 100,000 BTU propane furnace (which nets 80,000) so I decided to go after an appliance that could max 120,000 BTU (which would net 100,000 btu) so I would have the extra umph to get thru the abnormal lows without more than 2 tendings per day. On the coldest days I burn 75-80 pounds which is roughly 42,000 btus per hour to maintain 75 degrees in the house. Keep in mind that maximun rated BTU output from the manufacturer isn't realistic. I would never want to push my furnace to produce 100,000 btus per hour. It probably wouldn't be safe and definitely wouldn't be efficient. My opinion would be to get a stove that is rated double what you need, so you don't have to crank the hell out of it and you could maintain the steady heat output required to get 12 hour burn times. Once you learn the burn, you'll see that even an oversized appliance can be cut back to throw low heat on warmer days. Those days you could get a 18-24 hour burn and not heat yourself out of the house. Better oversized than undersized. :D

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lowfog01
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Posts: 3895
Joined: Sat. Dec. 20, 2008 8:33 am
Hand Fed Coal Stove: Mark II & Mark I
Coal Size/Type: nut/pea
Location: Springfield, VA

Post Sun. Aug. 11, 2013 6:58 am

The Mark II is a heat monster that you should be able to get a 20 hour burn out of with no effort. I've burned one for 7 or 8 years and get 12 - 14 hour burns routinely because that's what convenient for my schedule, I get up in the morning I tend the stove, I go to bed I tend the stove. The one issue I know you will have with the Mark II is the small ashpan. That will fill up fast - get two if at all possible so you can switch them out quickly. The Harman is a very easy stove to use and as I've said is a heat monster. Good luck, Lisa
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wilder11354
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Posts: 939
Joined: Sat. Jan. 29, 2011 10:48 pm
Hand Fed Coal Boiler: Harman SF260 Boiler
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed
Location: Montrose, Pa.

Post Sun. Aug. 11, 2013 8:07 am

not a Mk2 user, but I live a few miles down the road from you. 12 hour burn times should be no problem, except on extremely cold/windy days. I burn a SF260 boiler, go 12 hours between tendings. Extreme cold days I try to get home mid day to top off with a little bit more coal, to ensure it will keep up the burn, and not get to low a fire and have a long recovery time after tending. But it will burn for 12 hours on the extrememly cold days, just takes longer to restoke the bed of coals.(recovery time).

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michaelanthony
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Posts: 3987
Joined: Sat. Nov. 22, 2008 10:42 pm
Hand Fed Coal Stove: Vigilant 2310, gold marc box stove, vogelzang pot belly coat rack
Baseburners & Antiques: Home Sparkle 12
Coal Size/Type: Coal Contractor's stove, a little Kimmels 'nut
Other Heating: Very cold FHA oil furnace
Location: millinocket,me.
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Post Sun. Aug. 11, 2013 8:12 am

...like jpete say's, it's about what works for you and your schedule. If I didn't have to get up and out for work I could squeeze 16 -20 hrs. of moderate heat, but I want HEAT and more than moderate so my stove works on my schedule not the other way around!
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