Plumbing & Heating Products

Weil Mclain Ultra Series 3-UE Gas Boiler

Weil Mclain Ultra Series 3-UE Gas Boiler

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



UG-80, UG-105, UG-155, UG-230, UG-299, UG-399

Key Features

  • 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

Efficiency Rating Chart

ModelA.G.A. Input (MBH)DOE Heating Capacity (MBH)Net I=B=R Ratings (MBH)Min. Vent SizeAnnual Fuel Utilization Efficiency (AFUE)
UG-80 80 71 62 2 or 3 in. PVC/CPVC 95.2%
UG-105 105 94 81 2 or 3 in. PVC/CPVC 95.3%
UG-155 155 139 123 3 in. PVC/CPVC 95.6%
UG-230 230 207 183 3 or 4 in. PVC/CPVC 95.4%
UG-299 299 270 234 4 in. PVC/CPVC 96.4%
UG-399 399 365* 317 4 in. PVC/CPVC 91.7%*

*Combustion Efficiency


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