Most Efficient Way to Control Boiler

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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Phil May
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Posts: 194
Joined: Sun. Nov. 06, 2011 9:12 pm
Stoker Coal Boiler: EFM 700
Coal Size/Type: Buckwheat
Stove/Furnace Make: EFM
Stove/Furnace Model: 700
Location: Wellsville NY

Post Sun. Jan. 08, 2012 8:14 pm

What is the most efficient way to control the boiler with a primary/secondary loop system. With indirect hot water it would seem quick supply would be important.

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Freddy
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Posts: 6606
Joined: Fri. Apr. 11, 2008 2:54 pm
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Mon. Jan. 09, 2012 6:07 am

OK, I'll bite....Do you mean efficient in dollars or in fuel used? In my opinion the most efficient way would be a cold start oil boiler with a thermostat on the wall along with an outdoor sensor to anticipate heat load. That being said.... no coal boiler is ever a cold start boiler. Oil is efficient with fuel, coal is efficient with dollars. If oil were still $.69 a gallon you wouldn't find a coil boiler in use.

Part of the beauty of an indirect hot water tank is that it doesn't need a terribly quick heat supply to maintain a good amount of hot water.
Last edited by Freddy on Mon. Jan. 09, 2012 6:11 am, edited 1 time in total.
Orrington, Maine
Fred

"If you can't say something nice, don't say anything at all".

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Rob R.
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Posts: 11354
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 Mon. Jan. 09, 2012 6:11 am

Freddy, cold start is a novel idea...but with a coal boiler there is always some heat being generated. I guess you could do it if you let the fire go out each day, then the boiler would go cold and you would get to start all over again. :lol:

As for the indirect, if it has enough storage the rate of recovery is less important. Generally you want the indirect first in the primary loop, and use the pipe size and circulator recommended in the install manual.

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Freddy
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Posts: 6606
Joined: Fri. Apr. 11, 2008 2:54 pm
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Mon. Jan. 09, 2012 6:14 am

*smile*

Rob, while you were typing I was editing.... I hit "send" before all my thoughts were down & spent 3 or 4 minutes re-writing... you were Johny on the spot! :)
Orrington, Maine
Fred

"If you can't say something nice, don't say anything at all".

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Phil May
Member
Posts: 194
Joined: Sun. Nov. 06, 2011 9:12 pm
Stoker Coal Boiler: EFM 700
Coal Size/Type: Buckwheat
Stove/Furnace Make: EFM
Stove/Furnace Model: 700
Location: Wellsville NY

Post Mon. Jan. 09, 2012 1:11 pm

I want the best way to use the least amount of coal and still have heat on demand. Constant circulation in primary loop or only circulate on demand. Fire boiler independent of zones or only when call for heat. Oil is a dirty word on here supprised you would even mention it.

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Sting
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Posts: 2970
Joined: Mon. Feb. 25, 2008 4:24 pm
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG
Location: Lower Fox Valley = Wisconsin

Post Mon. Jan. 09, 2012 7:27 pm

There is the best way

and there is the best way

you want comfort or economy

pick one
When you turn your boiler on -Does it return the favor?
I have finally lost my mind. Don't bother to return it. It wasn't working properly anyway!

Phil May
Member
Posts: 194
Joined: Sun. Nov. 06, 2011 9:12 pm
Stoker Coal Boiler: EFM 700
Coal Size/Type: Buckwheat
Stove/Furnace Make: EFM
Stove/Furnace Model: 700
Location: Wellsville NY

Post Thu. Jan. 12, 2012 2:30 pm

What are the pros and cons. The c70 I have now is primary loop constant circ with boiler temp controlled by aquastat with a high limit dump zone.

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