SL 26-260g3

SL 40-399g3

SL 40-399g3(Ti)

SL Commercial High Efficiency Condensing Boilers

Suitable for large residential or light commercial applications. 

Touch Screen Boiler Controller:
• Express setup
• Remote monitoring & diagnostics
• Easy USB programmability
• True native BACnet
• Intuitive alert system
• Simplified load pairing
• Visible flame current.
· Better efficiency 95% AFUE on the SL 26-260G3.
· 96% Thermal efficiency on the SL 40-399G3
· Multi-boiler communication up to 9.5 million Btu/h (24 boilers) without additional controls.
· With 24 x 399 boilers turndown ratio is 240:1 = min. firing rate range is 40,000 Btu/h all the way up to 9.5 million Btu/h in 1000 Btu/h increments.
· PVC/CPVC/PPs approved – venting up to 400 feet.
· Now featuring multiple zone pump control – up to 4 zones. Replacing the need for external pump controls.
· MFZ Technology: Patented moisture management system. Protects and ensures long life for all components in the boiler.
· DDC Control 0-10 VDC or 4-20 mA without additional controls.
· Optional SL 40-399 316Ti Titanium enhanced heat exchanger available.
· DHW opt out priority for multi boiler systems.
· Reverse flow detection.
· Up to 10 year commercial heat exchanger warranty. 

SPECIFICATIONSSL 26-260G3SL 40-399G3/SL 40-399Ti
CSA Input (Natural Gas or Propane *) – MBH26 – 26040 – 399
CSA Input (Natural Gas or Propane *) – KW7.6 – 76.211.7 – 117
CSA Output – MBH24.9 – 23938.4 – 383
CSA Output – KW7.31 – 70.011.2 – 112
Efficiency95% (AFUE)96% (CE/TE)
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 – Watts ( without pumps)127190
Weight (empty) – lbs/Kg162 / 74240 / 110
Pressure vessel water content – USG/Liters4.64 / 17.66.66 / 25.2
Max boiler flow rate – USgpm2545
Min boiler flow rate – USgpm620
Max operating pressure – psig3080
Min water pressure – psig88
Approved installation altitude – ASL0 – 12,000 ft0 – 12,000 ft
Ambient temperature – Low (°F/°C)32°F / 0°C32°F / 0°C
Ambient temperature – High (°F/°C)122°F / 50°C122°F / 50°C
Max relative humidity (non-condensing)90%90%
Min water temperature (°F/°C)34°F / 1°C34°F / 1°C
Max water temperature (electronic-limit) (°F/°C)190°F / 88°C190°F / 88°C
Heating surface area – ft² / m²22.71 / 2.1136.56 / 3.40
Max ΔT – supply / return (electronic fence)40°F40°F
Maximum equivalent vent length, each side 3”200′ 
(Natural Gas or Propane) 4”  200’
Air intake options: either direct vent or indoor supply  

MAXIMUM EQUIVALENT VENT LENGTH
 SL 26-260G3SL 40-399G3/SL 40-399Ti
Sched.40; Rigid PPs
3”200’ 
4” 200’
90° Vent elbowallow 8’ equivalentallow 8’ equivalent
90° Long sweep elbowallow 5’ equivalentallow 5’ equivalent
45° Elbowallow 3’ equivalentallow 3’ equivalent
PPs 87-90° Elbowsuse 8’ equivalentuse 8’ equivalent
2” SS Sidewall Terminal 
3” SS Sidewall Terminalallow 20’ equiv. of 3” sched. 40allow 65’ equivalent
3” CPVC for each 1’ allow 3.2’ equivalent
Flexible PPs  
3” Flexible60’ (max.) lineal x 3.33 = equiv. 
4” Flexible 160’ max, using 1.2 x for equiv. length


PIPING CONNECTIONS SL 26-260G3 / SL 40-399G3
AExhaust Outlet3” (260) / 4″ (399) Schedule 40
BCombustion Air3” (260) / 4″ (399) Schedule 40
CRelief Valve & Air Vent3/4” NPT – F
DTouchscreen Display2 1/4” x 4
EWater Outlet1 1/2” NPT – M
FWater inlet1 1/2” NPT – M
GKnock-outs (8)1/2”
HGas Inlet3/4” NPT – F
I

Condensate Outlet

3/4” Hose