Gas-fired boilers
The best combination of gas heating and energy efficiency
Ultra Series 3 Gas Boiler Rating: 93% AFUE
Ultra Series 3 delivers peace of mind, unmatched comfort, and immediate payback in energy savings.
Models: UG-80, UG-105, UG-155, UG-230, UG-310
- 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
- *Ultra 310 93.3% AFUE rating is a gross output and combustion efficiency.
Ultra Series 2 Gas Boiler Rating: 93% AFUE
Highest efficiency comfort heating
Models: UG-80, UG-105, UG-155, UG-230, UG-310
- 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
- Electronic control module automatically adjusts blower speed and gas flow rate in response to environment
- Modulates with 5 to 1 turndown 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
- *Ultra 310 93.3% AFUE rating is a gross output and combustion efficiency.
GV gas boiler Rating: 87% AFUE
High Efficiency Gas, Power Vented Boiler (Water)
Models: GV-3, GV-4, GV-5, GV-6
- Gas-fired direct vent water boiler with cast iron sections
- Uses sealed combustion technology which reduces energy usage by eliminating air infiltration
- Control module and ignition control with mistake-proof wiring and diagnostic indicator lights
- On-board pictorial wiring diagrams and troubleshooting guide
- Fast power hookup with external J-box and pre-stripped wires
- Low NOx Certified by South Coast Air Quality Management District (Rule 1146.2) in California
- Easily accessible components, and fewer parts for quick and easy servicing
- Energy Star Rating
- Simple propane conversion
CGi gas boiler Rating: 81% AFUE
High Efficiency Gas, Induced Draft Boiler (Water)
Models: CGi-25, CGi-4, CGi-5, CGi-6, CGi-7, CGi-8, CGi-3
- Gas fired water boiler with cast iron sections
- Direct vent capability
- Can be used with natural or propane gas
- All units are factory-tested, and include a limited lifetime warranty on cast iron sections
- Compact design saves valuable living space
- No vertical draft hood and no mechanical vent damper
- Intermittent electronic ignition with standard components for easy servicing
CGs gas boiler Rating: 83% AFUE
High Efficiency Gas, Direct Vent Boiler (Water)
Models: CGs-3, CGs-4, CGs-5, CGs-6
- Uses sealed combustion technology which reduces energy usage by eliminating air infiltration
- Compact design saves valuable living space
- Control module and ignition control with mistake-proof wiring and diagnostic indicator lights
- Uses stainless steel burners for quieter ignition, longer life, and improved combustion.
- Easily accessible controls, vertical flueways and top cleaning for easy and quick servicing
- Gas fired water boiler with cast iron sections
CGt gas boiler Rating: 81% AFUE
High Efficiency Gas, Tankless Heater (Water)
Models: CGt-PIN
The CGt is available in one size and has a built-in tankless heater as standard equipment.
- The CGt gas boiler from Weil-McLain offers a compact design boiler that also provides domestic hot water.
- Other features include high-grade stainless steel burners, integrated control module and venting flexibility.
CGa gas boiler Rating: 83% AFUE
Atmospheric Gas Boiler (Water)
Models: CGA-3, CGA-4, CGA-5, CGA-6, CGA-7, CGA-8, CGA-25
- Control module and ignition control with mistake-proof wiring and diagnostic indicator lights
- 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
EG gas boiler Rating: 82% AFUE
Atmospheric Gas Boiler (Water or Steam)
Models: EG-30, EG-35, EG-40, EG-45, EG-50, EG-55, EG-65, EG-75
- Comes with automatic vent damper for higher efficiencies and reduced fuel consumption
- Easy access to controls for convenient servicing
- Available with standing pilot or intermittent electronic ignition
- A versatile gas cast iron boiler for water or steam applications
Oil-fired boilers
Maximum efficiency and reliability in oil heating products
Ultra oil
Rating: 86% AFUE
3-pass cast iron high efficiency heat exchanger
Models: UO-3 (0.80 GPH), UO-3 (1.00 GPH), UO-4, UO-5
- 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
- Energy Star Rating
WGO oil boiler
- Rating: 85% AFUE
High Efficiency Oil Boiler (Water)
Models: WGO-2, WGO-3, WGO-4, WGO-5, WGO-6, WGO-7, WGO-8, WGO-9
- Energy Star Rating
- 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
- Dedicated water-only oil boiler with cast iron section - no tankless heater or cover plate
- 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
WTGO oil boiler
- Rating: 85% AFUE
High Efficiency Oil Boiler - Tankless Heater (Water)
Models: WTGO-6, WTGO-7, WTGO-5, WTGO-8, WTGO-9, WTGO-3, WTGO-3L, WTGO-4
- 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
- Oil-fired water boiler with cast iron sections
- Energy Star Rating
- Available assembled or as a knockdown for installation areas with limited space
SGO oil boiler
- Rating: 84% AFUE
Oil Boiler with Tankless Heater Opening (Steam Or Water)
Models: SGO-3, SGO-4, SGO-5, SGO-6, SGO-7, SGO-8, SGO-9
- 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
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