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SFC 125

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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 assures you unrivaled high-efficiency and economical operation year in, year out.

Features

SIMPLE

Mount > Connect > Plug-in > Enjoy endless heat & hot water
  • 2 independent copper waterways embedded in a cast aluminum block
  • A total of 5 moving parts – Unparalleled in the industry (Fan, Pump,  Bypass Valve, Gas Valve & Damper)
  • New illuminated touchscreen control display panel
  • Contractor friendly, reduced internal parts, easy to install, maintain and service. 

RELIABLE

  • 30-year track record, 2 million installations worldwide
  • Innovative state of the art electronic control 
  • Compatible with standard Propylene Glycol
  • Built-in bypass valve to prevent temperature fluctuations (SFC 199)
  • No need for a 3-way valve or secondary DHW plate heat exchanger
  • Will accept a 0-10 VDC signal

EFFICIENT

  • 95% AFUE with full ASME-rated heat exchanger
  • Packaged with a high-efficiency variable speed pump (ECM)
  • Outdoor reset technology increases efficiency by lowering the water temperature automatically
  • Advanced modulating temperature control

Technical Data

SPECIFICATIONS SFC 125SFC 199
CSA Input (Natural Gas or Propane) – MBH 16.5 – 9928.3 – 125
CSA Input (Natural Gas or Propane) – KW 4.84 – 29.08.29 – 36.6
CSA Output – MBH 15.8 – 88.927.1 – 111
CSA Output – kW 4.63 – 26.07.94 – 32.5
DHW – CSA Input (Natural Gas or Propane) – MBH 16.5 – 12528.3 – 199
DHW – CSA Input (Natural Gas or Propane) – KW 4.84 – 36.68.29 – 58.3
A.F.U.E 95%95%
Min gas pressure (Nat. Gas or Propane) – inch w.c. 44
Max Gas Pressure (Nat. Gas or Propane) – inch w.c. 1414
Power (120Vac/60Hz) – Watts @ full fire with internal pump 120120
Weight (empty) – lbs/Kg 85 / 3984 / 38
Pressure vessel water content – USG/Liters 0.5/1.90.19/.72
Max boiler flow rate – USgpm 1012
Min boiler flow rate – USgpm 22
Max operating pressure – Space Heating Coil – psig 43.543.5
Max operating pressure – Domestic Hot Water Coil – psig 150150
Min water pressure – psig 88
Approved installation altitude – ASL 10,000 ft10,000 ft
Ambient temperature – Low (°F/°C) 32/032/0
Ambient temperature – High (°F/°C) 122/50122/50
Max relative humidity (non-condensing) 90%90%
Min water temperature – Space Heating (°F/°C) 50/1050/10
Max water temperature – Space Heating (°F/°C) 194/90194/90
Min water temperature – Domestic Hot Water (°F/°C) 104/40104/40
Max water temperature – Domestic Hot Water (°F/°C) 149/65149/65
Min flow rate to activate DHW heating – USgpm 0.50.5
Max flow rate DHW heating – USgpm 47
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 GPM5.0 GPM
VENTINGMAXIMUM EQUIVALENT LENGTH
Schedule 40 PVC, CPVC or PPs(each side)
2”35’
3”120’
2″ or 3″ 90′ Long Sweep Vent ElbowAllow 5 equivalent feet
2″ or 3″ 90′ Short Sweep Vent ElbowAllow 8 equivalent feet
2″ or 3″ 45′ Vent ElbowAllow 3 equivalent feet
PPs 
PPs 87-90′ ElbowAllow 8 equivalent feet
Flex PPS 
3″ PPs Flex(Max. 35) actual feet times 1.4
SURFACEDISTANCE FROM COMBUSTABLE SURFACESRECOMMENDED DISTANCE FOR INSTALLATION & SERVICE
Front2”24”
Rear0”0”
Left Side1.5”6”
Right Side4”6”
Top2”24”
Bottom8”24”

Connections

 DESCRIPTIONSFC 125 SFC 199 
AExhaust outlet3” Schedule 403” Schedule 40
BCombustion air3” Schedule 403” Schedule 40
CCold dom. water connection1/2” Male NPT3/4” Male NPT
DHot dom. water connection1/2” Male NPT3/4” Male NPT
EHeating water inlet (return)3/4” Male NPT3/4” Male NPT
FHeating water outlet (supply)3/4” Male NPT3/4” Male NPT
GGas inlet1/2” Male NPT3/4” Male NPT
HCondensate outlet3/4” Hose3/4” Hose
 IControl Wiring Passage7/16” Rubber Plug7/16” Rubber Plug

Touch Panel

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.

ANumerical DisplayMain Display
BPlus & MinusTemperature Adjustment
CFlameBurner ON Indicator
DDotPower ON Indicator
EFaucetDHW Indicator
FRadiatorHeating Indicator
GWrenchService / Reset
HReturn ArrowEnter / Save
INumerical DisplayService

Documentation

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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 assures you unrivaled high-efficiency and economical operation year in, year out.

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