Weil-McLain Ultra Boiler

Ultra Series 3-UE delivers peace of mind, unmatched comfort and immediate payback in energy savings.




  • Gas fired water boiler with cast aluminum heat exchanger
  • Venturi mixing body mixes air and gas providing higher efficiency
  • Designed to operate in low temperature condensing applications
  • Outdoor reset and domestic hot water priority standard
  • Negative regulated gas valve precisely delivers gas to the boiler
  • U-Control gives you the power for easy set-up and maintenance
  • Modulates with 5 to 1 turn-down ratio capability
  • Variable speed motor matches combustion output to heating needs
  • High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications
ModelA.G.A. Input (MBH)DOE Heating Capacity (MBH)Net I=B=R Ratings (MBH)Min. Vent SizeAnnual Fuel Utilization Efficiency (AFUE)
UG-808071622 or 3 in. PVC/CPVC95.2%
UG-10510594812 or 3 in. PVC/CPVC95.3%
UG-1551551391233 in. PVC/CPVC95.6%
UG-2302302071833 or 4 in. PVC/CPVC95.4%
UG-2992992702344 in. PVC/CPVC96.4%
UG-399399365*3174 in. PVC/CPVC91.7%*

*Combustion Efficiency

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