Hand Fired Harman Temps

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.
Post Reply
User avatar
Cap
Member
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 Mon. Oct. 06, 2008 10:30 pm

Hello List,
We have many new carbon burners here this season. I thought I would post some images of idea temps for a Harman hand fired. In my case, a SF 250 with the firebox reduced by 50%. Therefore my firebox is about 12"x12". Roughly the size of a Harman Mark I. Baro set at .05"wc.
My burn is at an easy simmer. This will comfortably heat a two story home & full basement with ambient temps 34F and above.
Attachments
10-6-08 007.jpg
Temps of hot air accumulating into the collector. I do not measure the actual steel plate temps. But it's hot!
10-6-08 009.jpg
Actual flue temp. below baro damper. Notice the 68F difference to the low side? This is a great thing.
10-6-08.jpg
I heat the domestic 80 gal hot water tank. 110F is perfect for a hot shower!
Cap
Lehigh Twp.
Northampton Co., PA

User avatar
Blackdiamonddoug
Member
Posts: 328
Joined: Wed. Jun. 11, 2008 8:52 am
Stove/Furnace Make: axemen 260 rebuilt by Matt
Stove/Furnace Model: stoker AA 260
Location: haverhill Ma

Post Tue. Oct. 07, 2008 7:11 pm

swagock valves and fitting and SS tubing and Bi-therm TI
Do you work at a power plant?
Nice job
BDD

User avatar
Cap
Member
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 Thu. Oct. 09, 2008 7:08 pm

No to power plant but I was an industrial gas technician since I was 18. Still in the business in a different capacity.
Thanks.
Cap
Lehigh Twp.
Northampton Co., PA

Visit Hitzer Stoves

User avatar
CoalHeat
Site Moderator
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 Thu. Oct. 09, 2008 9:28 pm

Looks good, Mark.
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."

User avatar
Cap
Member
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 Tue. Dec. 23, 2008 8:37 pm

I posted back in Oct with images showing the efficency of a hand fired stove when it is simmering along on a 40F day. You can see the hot air is much higher than the stack temps. Page up a few posts to see images.

Now, see below images on a cold day in the low 20's. These images from today. Last night I was pushing higher temps when ambient was in the teens. 300F hot air & 450F stack when outside temps were 17F. This hows how a hand fired stove will loose efficiency the harder it is pushed to create heat. My take on this trial, a hand fired stove is most efficient when burning at an easy simmer. Once you push the flames 6"+, heat will fly right up the stack, baro or no baro.

I've also performed tests with my baro set at .06w.c. thru .15"w.c. My conclusion is simple. The more the baro damper is open (.06), the less heat the stove will make. The more it is closed (.15), the more heat will be generated. Its all relative at a given outside temp & relative humidity. And as you create more heat, your firebox will empty sooner. Simple, right? I believe the baro damper will help for high winds & huge barometric changes to the atmosphere and or to make operation easier on an older maybe loose stove. This test was only performed using a Harman handfired, no stokers, no coal fired boilers.
250F 001.jpg
Hot air off of the heat accumulator. 250F
250F 002.jpg
Stack temps below baro damper. 410F
250F 003.jpg
Reads in metric. 1.9mm w.c. = .075" w.c.
Cap
Lehigh Twp.
Northampton Co., PA

Post Reply

Return to “Hand Fired Coal Stoves & Furnaces Using Anthracite”