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Boilers

If your home has hot water radiators in each room for heat, you have a boiler to heat the water. Like a furnace, the energy efficiency of a boiler is given as the Annual Fuel Utilization Efficiency (AFUE). Boilers manufactured since 1992 must have an AFUE of at least 80%. We offer a complete line of gas and oil boilers starting at 80% AFUE and up.

Gas Boiler Product Offering

Feature Comparison
Gas Boiler Product Offering
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Gas Boiler Product Offering
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Gas Boiler Product Offering
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Gas Boiler Product Offering
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Product NameEvergreen Gas BoilerUltra Gas BoilerGas Boiler Series 3Gas Boiler Series 2
Model FamilyEVGUGCGiCGa
Annual Fuel Utilization EfficiencyUp to 96.5% AFUEUp to 94.1% AFUEUp to 85.1% AFUEUp to 84% AFUE
Energy Star RatedNoNoNoNo
Heat Exchanger Warranty12 Year Heat Exchanger Warranty12 Year Heat Exchanger Warranty12 Year Heat Exchanger Warranty12 Year Heat Exchanger Warranty
Warranty2 Year Parts Warranty2 Year Parts Warranty2 Year Parts Warranty2 Year Parts Warranty
Manufacturer's Stated Benefits
  • Stainless Steel Fire Tube Heat Exchanger with non-metallic base
  • Floor Standing Boiler with optional wall mount kit
  • Modulating Condensing Boiler with 10:1 Turndown
  • 4 Pump/Auxiliary Outputs
  • Up to 8 Multiple Boiler Control with lead/lag rotation
  • Modbus® to BMS connectivity
  • Each input can be assigned to a priority (Up to 3 Priorities)
  • Multiple Inputs can be assigned one priority (Zone Based Control)
  • All Lag Boiler Inputs and Output can be used
  • 0-10 Volt Input (modulation or set point)
  • Configurable Auxiliary Input/Output System
  • Boiler Circulator Included
  • 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
  • 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
  • Gas fired water boiler with cast iron sections
  • Natural draft and direct exhaust capability
  • Can be used with natural or propane gas
  • All units are factory-tested
  • Compact design saves valuable living space
  • No vertical draft hood and no mechanical vent dampe
  • Intermittent electronic ignition with standard components for easy servicing
  • Compact design saves valuable living space
  • Stainless steel burners for quieter ignition, longer life, and improved combustion
  • Gas fired water boiler with cast iron sections
  • Easily accessible controls, vertical flueways and top cleaning for easy and quick servicing

Oil Boiler Product Offering

Feature Comparison
Oil Boiler Product Offering
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Oil Boiler Product Offering
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Oil Boiler Product Offering
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Oil Boiler Product Offering
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Product NameUltra Oil BoilerWTGO Oil BoilerWGO Oil BoilerSGO Oil Boiler
Model FamilyULTRAWTGOWGOSGO
Annual Fuel Utilization Efficiency87% AFUEUp to 87% AFUEUp to 87% AFUE84% AFUE
Energy Star RatedENERGY STAR®ENERGY STAR® ENERGY STAR®No
Heat Exchanger Warranty12 Year Limited Heat Exchanger Warranty12 Year Limited Heat Exchanger Warranty12 Year Limited Heat Exchanger Warranty12 Year Limited Heat Exchanger Warranty
Warranty2 Year Limited Warranty2 Year Limited Warranty2 Year Limited Warranty2 Year Limited Warranty
Manufacturer's Stated Benefits
  • Optional Advanced Features Module that provides indoor/outdoor reset, DHW priority, stage firing and more
  • Dedicated water-only oil boiler
  • Flexible direct or chimney venting - no power assisted fan needed
  • Reversible swing-away burner door
  • Three-pass cast iron heat exchanger with captured elastomer seals
  • Oil-fired water boiler with cast iron sections
  • High capacity / high efficiency tankless heater
  • Quick open top and swing-away burner door with full chamber access increases visibility for inspection and servicing
  • Includes factory-wired circulator, service switch and Weil-McLain exclusive captured elastomer seals for added reliability
  • Recessed target wall design protects unit from flue brushes
  • Two flue outlets- rear and top - for complete venting flexibility
  • Available assembled or as a knockdown for installation areas with limited space
  • Dedicated water-only oil boiler with cast iron sections - no tankless heater or cover plate
  • Quick open top and swing-away burner door with full chamber access increases visibility for inspection and servicing
  • Two flue outlets- rear and top - for complete venting flexibility
  • Recessed target wall design protects unit from flue brushes
  • Includes factory-wired circulator, service switch and Weil-McLain exclusive captured elastomer seals for added reliability
  • Oil-fired steam boiler with cast iron sections and tankless heater opening
  • Has large water content for longer steaming times
  • Two flue outlets- rear and top - for complete venting flexibility
  • Includes factory-wired circulator, service switch and Weil-McLain exclusive captured elastomer seals for added reliability
  • Quick open top and swing-away burner door with full chamber access increase visibility for inspection and servicing
  • Recessed target wall design protects unit from flue brushes