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Weil-McLain Boilers

The "Gold Standard" in boilers delivers peace of mind, unmatched comfort and immediate payback in energy savings.

WM97 Key Features
  • Gas fired water boilers with stainless steel or cast aluminum heat exchangers
  • 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


Model Heat Exchanger A.G.A. Input (MBH) DOE Heating Capacity (MBH) Net I=B=R Ratings (MBH) Min. Vent Size Annual Fuel Utilization Efficiency (AFUE)
WM97+70 Stainless Steel 23-70 65 57 3 in PVC/CPVC 97.3
WM97+110 Stainless Steel 37-110 101 88 3 in PVC/CPVC 97.0
WM97+155 Stainless Steel 52-155 143 124 3 in PVC/CPVC 97.2
UG-80 Cast Aluminum 80 71 62 2 or 3 in. PVC/CPVC 95.2%
UG-105 Cast Aluminum 105 94 81 2 or 3 in. PVC/CPVC 95.3%
UG-155 Cast Aluminum 155 139 123 3 in. PVC/CPVC 95.6%
UG-230 Cast Aluminum 230 207 183 3 or 4 in. PVC/CPVC 95.4%
UG-299 Cast Aluminum 299 270 234 4 in. PVC/CPVC 96.4%
UG-399 Cast Aluminum 399 365* 317 4 in. PVC/CPVC 91.7%*

Contact us for product selection. We are glad to help.

Image Model Name Price Add to Cart
wm97.png WM97+70 Weil-McLain WM97+ 97% 70,000 BTU/hr Boiler - Stainless Price: $3,448.36
wm97.png WM97+110 Weil-McLain WM97+ 97% 110,000 BTU/hr Boiler - Stainless Price: $3,778.24
wm97.png WM97+155 Weil-McLain WM97+ 97% 155,000 BTU/hr Boiler - Stainless Price: $4,869.47
ultra_boiler_biggg.jpg UG-80-NG Weil-McLain Ultra Series 3-UE 95.2% 80,000 BTU/hr Natural Gas Boiler Price: $3,555.66
ultra_boiler_biggg.jpg UG-80-LP Weil-McLain Ultra Series 3-UE 95.2% 80,000 BTU/hr Propane Boiler Price: $3,555.66
ultra_boiler_biggg.jpg UG-105 Weil-McLain Ultra Series 3-UE 95.3% 105,000 BTU/hr Gas Boiler Price: $3,940.11
ultra_boiler_biggg.jpg UG-155 Weil-McLain Ultra Series 3-UE 95% 155,000 BTU/hr Gas Boiler Price: $4,420.09
ultra_boiler_biggg.jpg UG-230 Weil-McLain Ultra Series 3-UE 95.4% 230,000 BTU/hr Gas Boiler Price: $4,999.59
ultra_boiler_biggg.jpg UG-299 Weil-McLain Ultra Series 3-UE 96.4% 299,000 BTU/hr Gas Boiler Price: $6,922.70
ultra_boiler_biggg.jpg UG-399 Weil-McLain Ultra Series 3-UE 92% 399,000 BTU/hr Gas Boiler Price: $8,047.02
389-900-180.jpg 389-900-180 Weil-McLain Wall Install Kit for Ultra Boilers Price: $48.46
Concentric-Vent.JPG 383-500-350 Weil-McLain Concentric Vent Kit for Ultra Boilers Price: $79.95
Concentric-Vent.JPG CONCVENT 3" PVC Concentric Vent Kit for Condensing Boilers and Water Heaters Price: $78.40