
SFC 199
Simple - Reliable - Efficient
A dual fired combi the SFC provides not only high-efficiency space heating, but unrivaled domestic hot water efficiency too. We call this ‘Double HE’. The secret lies in our patented two-in-one heat exchanger that ensures optimal heat transfer and minimal heat loss.
Flue gases are condensed with both space heating and domestic hot water production ensuring heat extraction to the fullest extent possible.
The SFC 199 assures you unrivaled high-efficiency and economical operation year in, year out.
Accessories: SUPERFLOW Contractor Parts Kit – Floor Stand – EZ Pipe Manifold

SIMPLE
Mount > Connect > Plug-in > Enjoy endless heat & hot water |
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RELIABLE
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EFFICIENT
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SPECIFICATIONS | SFC 125 | SFC 199 | |
CSA Input (Natural Gas or Propane) – MBH | 16.5 – 99 | 28.3 – 125 | |
CSA Input (Natural Gas or Propane) – KW | 4.84 – 29.0 | 8.29 – 36.6 | |
CSA Output – MBH | 15.8 – 88.9 | 27.1 – 111 | |
CSA Output – kW | 4.63 – 26.0 | 7.94 – 32.5 | |
DHW – CSA Input (Natural Gas or Propane) – MBH | 16.5 – 125 | 28.3 – 199 | |
DHW – CSA Input (Natural Gas or Propane) – KW | 4.84 – 36.6 | 8.29 – 58.3 | |
A.F.U.E | 95% | 95% | |
Min gas pressure (Nat. Gas or Propane) – inch w.c. | 4 | 4 | |
Max Gas Pressure (Nat. Gas or Propane) – inch w.c. | 14 | 14 | |
Power (120Vac/60Hz) – Watts @ full fire with internal pump | 120 | 120 | |
Weight (empty) – lbs/Kg | 85 / 39 | 84 / 38 | |
Pressure vessel water content – USG/Liters | 0.5/1.9 | 0.19/.72 | |
Max boiler flow rate – USgpm | 10 | 12 | |
Min boiler flow rate – USgpm | 2 | 2 | |
Max operating pressure – Space Heating Coil – psig | 43.5 | 43.5 | |
Max operating pressure – Domestic Hot Water Coil – psig | 150 | 150 | |
Min water pressure – psig | 8 | 8 | |
Approved installation altitude – ASL | 10,000 ft | 10,000 ft | |
Ambient temperature – Low (°F/°C) | 32/0 | 32/0 | |
Ambient temperature – High (°F/°C) | 122/50 | 122/50 | |
Max relative humidity (non-condensing) | 90% | 90% | |
Min water temperature – Space Heating (°F/°C) | 50/10 | 50/10 | |
Max water temperature – Space Heating (°F/°C) | 194/90 | 194/90 | |
Min water temperature – Domestic Hot Water (°F/°C) | 104/40 | 104/40 | |
Max water temperature – Domestic Hot Water (°F/°C) | 149/65 | 149/65 | |
Min flow rate to activate DHW heating – USgpm | 0.5 | 0.5 | |
Max flow rate DHW heating – USgpm | 4 | 7 | |
Max equivalent vent length 2″ (each side) | 35′ | 35′ | |
Max equivalent vent length 3″ (each side) | 120′ | 120′ | |
Domestic hot water delivery: @70°F/ 39°C temp. rise | 3.2 GPM | 5.0 GPM |
VENTING | MAXIMUM EQUIVALENT LENGTH |
Schedule 40 PVC, CPVC or PPs | (each side) |
2” | 35’ |
3” | 120’ |
2″ or 3″ 90′ Long Sweep Vent Elbow | Allow 5 equivalent feet |
2″ or 3″ 90′ Short Sweep Vent Elbow | Allow 8 equivalent feet |
2″ or 3″ 45′ Vent Elbow | Allow 3 equivalent feet |
PPs | |
PPs 87-90′ Elbow | Allow 8 equivalent feet |
Flex PPS | |
3″ PPs Flex | (Max. 35) actual feet times 1.4 |
SURFACE | DISTANCE FROM COMBUSTABLE SURFACES | RECOMMENDED DISTANCE FOR INSTALLATION & SERVICE |
Front | 2” | 24” |
Rear | 0” | 0” |
Left Side | 1.5” | 6” |
Right Side | 4” | 6” |
Top | 2” | 24” |
Bottom | 8” | 24” |
DESCRIPTION | SFC 125 | SFC 199 | |
A | Exhaust outlet | 3” Schedule 40 | 3” Schedule 40 |
B | Combustion air | 3” Schedule 40 | 3” Schedule 40 |
C | Cold dom. water connection | 1/2” Male NPT | 3/4” Male NPT |
D | Hot dom. water connection | 1/2” Male NPT | 3/4” Male NPT |
E | Heating water inlet (return) | 3/4” Male NPT | 3/4” Male NPT |
F | Heating water outlet (supply) | 3/4” Male NPT | 3/4” Male NPT |
G | Gas inlet | 1/2” Male NPT | 3/4” Male NPT |
H | Condensate outlet | 3/4” Hose | 3/4” Hose |
I | Control Wiring Passage | 7/16” Rubber Plug | 7/16” Rubber Plug |
The SFC controller functions as an interactive touch-sensitive panel with buttons that light up, showing indicators such as numbers, icons, or letters. Some of these lit indicators signify boiler operational status. Other indicators enable you to program the boiler.
A | Numerical Display | Main Display |
B | Plus & Minus | Temperature Adjustment |
C | Flame | Burner ON Indicator |
D | Dot | Power ON Indicator |
E | Faucet | DHW Indicator |
F | Radiator | Heating Indicator |
G | Wrench | Service / Reset |
H | Return Arrow | Enter / Save |
I | Numerical Display | Service |
Manuals
↓ SFC 125 Installation & Operating Instruction Manual |
↓ SFC 199 Installation & Operating Instruction Manual |
↓ SFC Controller Manual |
↓ SFC User Manual |
Literature
↓ SFC Sales Brochure |
↓ SUPERFLOW Parts Kit |
↓ EZ Pipe Manifold |
↓ Floor Stand |
↓ SFC 125 Engineering Submittal |
↓ SFC 199 Engineering Submittal |
Other
↓ SFC Measurements |
↓ SFC Junction box |