EFM 350-520

EFM 350-520

PostBy: coalboy On: Wed May 21, 2008 5:52 am

Could some one tell me what the specs are on these two units. BTU'S ,WEIGHT ,OVER ALL DIMENSIONS. Thanks Coalboy
coalboy
 
Stove/Furnace Make: AxemanAnderson
Stove/Furnace Model: 1949 AA130

Re: EFM 350-520

PostBy: stoker-man On: Wed May 21, 2008 5:57 am

42" long (without the coil, 41"), 25 3/4" wide and 27 1/2" high.

Gross output 220,000 BTUH, Net output 188,600 BTUH

Total weight 1300, with the boiler being the heaviest at 800#, 5/16" boiler plate.

The 350 is a smaller version of the 520. They are only available in used condition.

Contact scrapper_23jr on this forum for a used 350.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM 350-520

PostBy: EnergyManager On: Wed Jul 09, 2008 12:22 pm

The EFM 350 is one unit that is sized better than the EFM 520 for modern homes. I have heard the sales pitch that the 520 can be gear down. But the 520 unit is far overkill for today’s better insulated homes. Bigger is not always better when it comes to efficiency, otherwise Big Cars would get as good mileage as smaller cars. Make the unit work harder and the efficiency will go up. This is from a person who is an mechanical engineer and understands the laws of science not Sales Hype. EFM Bring the EFM 350 back into PRODUCTION
EnergyManager
 
Stove/Furnace Make: EFM 350

Re: EFM 350-520

PostBy: stoker-man On: Wed Jul 09, 2008 3:10 pm

We have made that opinion LOUD and CLEAR to the company. We are re-introducing the hand-fired WCB-24 and there is a smaller boiler being looked at to fill the 350 gap.

Just like everybody else in the stoker business, we are way behind on our orders for the 520, but I will keep sending the message to the company.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM 350-520

PostBy: EnergyManager On: Wed Jul 09, 2008 9:44 pm

Good Job stoker-man...
EnergyManager
 
Stove/Furnace Make: EFM 350

Re: EFM 350-520

PostBy: LsFarm On: Fri Jul 11, 2008 8:39 pm

The 350 is the same height as a 520, it is 2" narrower, and 4" shorter,, may hold 5-10 gallons less water,, the stoker is the same as the 520, just set to be limited to 15# of coal per hour instead of 25# per hour..

So maybe the boiler would use $20-$50 dollars less steel, take the same time to build, have the same number of parts, stoker, and labor,, and to what effect?? with tooling up costs, it would be the same cost as a 520.. and no more efficient..

The very slight reducttion of heated surface area in the boiler is not going to make this smaller boiler any measureable amount more efficient.. If the boiler was say 25% smaller, maybe the steel savings would be worth a few hundred dollars off the purchase price..But reducing the heated surface area does not make for more efficiency, nor does a smaller stoker, not with the EFM design. Now with an AA boiler, using a 260 where a AA130 would work is probably going to cost you some unburnt coal.. but not with the underfeed pot design in an EFM.

But I'd not hold my breath waiting for EFM to start another product line up, when they are selling all they can produce, and have a bituminous experiment ongoing..

Greg L.
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland

Re: EFM 350-520

PostBy: mozz On: Fri Jul 11, 2008 10:39 pm

Somewhere on this page was a pdf which gave measurements, heating capacities etc. etc of the popular older style boilers such as EFM AA etc.
http://www.heatinghelp.com/library.cfm
This link is broken, either the page no longer exists or there is some other issue like a typo.
mozz
 
Stoker Coal Boiler: Axeman Anderson 1982 AA-130 Steam

Re: EFM 350-520

PostBy: coal berner On: Fri Jul 11, 2008 11:31 pm

Read Thae last Post on the first Page I have all of the sizes for all of the EFM stoker boilers models except The 520 Highboy

EFM, Keystoker, or AHS
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520