Dual Feeds Into and Out of HS Tarm?

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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pine grove coal user
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Posts: 119
Joined: Tue. Feb. 24, 2009 8:50 pm
Hand Fed Coal Boiler: H. S. Tarm, model 202, 1980
Hand Fed Coal Stove: Reading 'bucket a day' stove in storage, waiting for attention
Coal Size/Type: Pea, from Little Buck mine
Other Heating: New Yorker oil burner which almost never runs, thanks to the Tarm!
Location: Pine Grove, Schuylkill County, Pennsylvania

Post Sun. Jun. 16, 2013 9:48 pm

Soon I will be installing my "new" Tarm boiler. I am installing it in parallel with my oil burner. A circulator pump will continuously circulate the Tarm water to the oil burner.
A while back I remember reading about cold spots inside an EFM 520 and the fix was that it was very important to have the incoming water come in at both sides of the boiler and the outgoing water going out both sides of the boiler. Is this how I should plumb my Tarm? Or would it be sufficient to just have the in/out at catty-corners (lower front-right and upper rear-left) of the boiler? Or am I over thinking this?
Is the Tarm susceptible to cold spots inside the boiler?

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Rob R.
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Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Jun. 16, 2013 10:02 pm

Some manufactures recommend the use of both return ports, others do not...what does the Tarm piping diagram show?

I suppose using both ports is best, but for most applications it will run perfectly fine with just one return port in use. If you were going to run the boiler wide open with a wide differential between the supply and return the use of both ports becomes more important.

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pine grove coal user
Member
Posts: 119
Joined: Tue. Feb. 24, 2009 8:50 pm
Hand Fed Coal Boiler: H. S. Tarm, model 202, 1980
Hand Fed Coal Stove: Reading 'bucket a day' stove in storage, waiting for attention
Coal Size/Type: Pea, from Little Buck mine
Other Heating: New Yorker oil burner which almost never runs, thanks to the Tarm!
Location: Pine Grove, Schuylkill County, Pennsylvania

Post Mon. Jun. 17, 2013 9:00 am

The piping diagram shows just one connection for both supply and return.
I was also thinking while it is still in the barn, connect a garden hose to one port on the bottom and filling it with water. It the water comes out both top ports evenly then I would know that using just one port at top and bottom would be okay.

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