I just received some interesting news today

User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Wed. Jun. 26, 2019 4:01 pm

McGiever wrote:
Wed. Jun. 26, 2019 3:58 pm
Where can I get a coal fired combi-boiler? :lol:
Install an AA-260 for DHW only use along side of your AA-130. DHW requires twice the heat of home heating.

CapeCoaler
Member
Posts: 5371
Joined: Sun. Feb. 10, 2008 3:48 pm
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post By: CapeCoaler » Wed. Jun. 26, 2019 11:27 pm

The Combi-Coal Boiler...
LOL...

User avatar
Richard S.
Mayor
Posts: 13301
Joined: Fri. Oct. 01, 2004 8:35 pm
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite
Location: NEPA

Post By: Richard S. » Fri. Jun. 28, 2019 10:41 am

nepacoal wrote:
Wed. Jun. 26, 2019 7:32 am
Wow, i never looked at NG boilers water capacity.
Don't know about the capacity on the one they installed here at my Grandmother's but it's not much. It only takes 1 or 2 minutes to bring it up to temp, you can watch the digital gauge go up, probably about a degree or two each second. The aquatstat by default has no lo setting so the water will drop to ambient room temp if there is no call for heat. Even if you wanted to set it it's blocked from factory from being set above 120.

User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Mon. Jul. 01, 2019 7:25 am

I stand corrected. A Combi-Boiler is not two boilers in one. It only has a single burner and it incorporates a water to water heat exchanger to provide DHW. Anytime that DHW is flowing heat to the home is cut off.


User avatar
McGiever
Member
Posts: 7963
Joined: Sun. May. 02, 2010 11:26 pm
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: RICE,PEA,NUT,STOVE /ANTHRACITE and EGG / BIT
Other Heating: Ground Source Heat Pump and some Solar
Location: Junction of PA-OH-WV

Post By: McGiever » Mon. Jul. 01, 2019 9:45 am

lsayre wrote:
Mon. Jul. 01, 2019 7:25 am
I stand corrected. A Combi-Boiler is not two boilers in one. It only has a single burner and it incorporates a water to water heat exchanger to provide DHW. Anytime that DHW is flowing heat to the home is cut off.
With that being said, then the boiler sizing would need to match the sizing requirements of which ever is the larger of the two loads...generally that is the DHW side.
Seems this negates the fuel savings sought by using a combi-boiler...

Rob R.
Site Moderator
Posts: 13483
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 By: Rob R. » Mon. Jul. 01, 2019 10:41 am

McGiever wrote:
Mon. Jul. 01, 2019 9:45 am
With that being said, then the boiler sizing would need to match the sizing requirements of which ever is the larger of the two loads...generally that is the DHW side.
Seems this negates the fuel savings sought by using a combi-boiler...
That is correct. From what I have read, the combi units are normally oversized for many homes.

User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Mon. Jul. 01, 2019 2:24 pm

The one I'm considering can only put 52,000 gross BTUH output into home heating, but it puts twice that into domestic hot water heating. All from the same burner. Very confusing.

Rob R.
Site Moderator
Posts: 13483
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 By: Rob R. » Tue. Jul. 02, 2019 6:38 am

Those combi units are also sensitive to low flow rates. A friend of mine has one, and said if he takes a cool shower he can feel the burner cycling off and on.

I would also expect some kind of annual maintenance to flush out the heat exchanger.


User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Tue. Jul. 02, 2019 9:04 am

One of the combi's I looked at (I believe the Weil-McLain AquaBalance 2) has a programmable percentage of output that can be assigned to home heating only, so for example if it delivers 150,000 BTUH for DHW, and its home heating percentage is set to 35%, then it can only deliver 52,500 BTUH into the zones of the home. I believe this is the first one I've come across that is being honest in explaining why the other unit I looked at has a single burner and claims 120K BTUH for DHW and 60K BTUH for home heating, with the presumption that rather than the home heating "cut off" being end user selectable as to percent, it is fixed at 50%.

The one with end user percentage selectability is great for dialing in the boilers max output to perfectly match the homes heat emitters and never (in theory) exceed them.

User avatar
franpipeman
Member
Posts: 355
Joined: Fri. Jan. 11, 2008 4:27 pm
Stoker Coal Boiler: efm 520 stoker fitzgibbons pressure vessel
Hand Fed Coal Stove: harman, russo
Coal Size/Type: rice
Other Heating: alpine propane condensing boiler radiant floor
Location: Wernersville pa

Post By: franpipeman » Sat. Jul. 13, 2019 9:15 am

lpg here is Central pa i just received a price for .879 cents per gallon . I use the gas for the temperate fall and spring when the highs may be 48 and the coal for the rest of the season. I use the same piping system but separate boilers of course. Its good to have two fuels for economy and redundancy

User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Mon. Jul. 15, 2019 5:51 pm

As fate has it, my coal supplier could not come up with Lehigh and offered me Blaschak at the Lehigh price. Delivery was made today.

User avatar
franpipeman
Member
Posts: 355
Joined: Fri. Jan. 11, 2008 4:27 pm
Stoker Coal Boiler: efm 520 stoker fitzgibbons pressure vessel
Hand Fed Coal Stove: harman, russo
Coal Size/Type: rice
Other Heating: alpine propane condensing boiler radiant floor
Location: Wernersville pa

Post By: franpipeman » Wed. Jul. 17, 2019 8:17 am

Lehigh usually less expensive than Blaschak?

User avatar
lsayre
Member
Posts: 16822
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post By: lsayre » Wed. Jul. 17, 2019 8:44 am

franpipeman wrote:
Wed. Jul. 17, 2019 8:17 am
Lehigh usually less expensive than Blaschak?
Around here it is.

Post Reply

Return to “Wood, Pellets, Gas, Oil, Geothermal & Other Heating Types”