Weil-McLain P-WTGO-3 115,000 BTU 85.3% AFUE Hot Water Oil Boiler

Model: P-WTGO-3 Item Number: 50058
Weil-McLain P-WTGO-3
Weil-McLain P-WTGO-3
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Specification Highlights
    New Learn More
    This product is new and has never been used. It's in its original packaging, which has not been opened.
    595 Pounds Learn More
    595 Pounds
    Total weight of the product and any included accessory/components. This total is not the shipping weight, as it does not include packing material, which may increase the overall shipping weight of this product.
    Product Line
    Hot Water
Recommended Accessories
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Required Accessories Add All Required
Installation Accessories
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Overview for Weil-McLain P-WTGO-3

Overview for Weil-McLain 386700832Over the last 130 years, Weil-McLain has built a reputation of designing some of the most reliable boilers in the marketplace. Their dedication to producing lasting heating solutions is seen in every boiler they make. The WTGO is a flexible, durable oil-fired combi boil. In the WTGO, Weil-McLain has taken their exceptional WGO design and added a tankless coil for water heating, making the WTGO an inclusive heating solution. Efficient energy use is a high point of the WTGO's design, allowing you to make the most of your energy dollar. Weil-McLain knows the value of longevity, that's why they used cast-iron for WTGO boiler sections. Between the high efficiency, durable construction, and flexibility the WTGO excels both as a replacement combi boiler and as an addition to new construction.
Product Features
Simple to ServiceInspecting and maintaining a WTGO is incredibly simple. Between the swing-away burner door and the quick-open top panel, the WTGO is always accessible. Weil-McLain uses a recessed target wall design to protect the unit from flue brushes during cleaning.Captured SealsSilicone-coated fiber ropes are used for sealing the boiler sections. These seals expand and contract with the boiler, keeping the unit watertight and preventing contaminants from entering your system.Venting FlexibilityWTGO boilers have two vent connections, one on the rear and one on the top. By providing an alternate venting set up, Weil-McLain has ensured that the WTGO is suited for a variety of installation conditions.Efficiency-Boosting InsulationHeat retention is critical to energy efficiency. Heat leakage represents energy use without any comfort gains. An extended, insulated steel jacket prevents heat from escaping the WTGO and improves the efficiency.Dual Purpose, One Small PackageSatisfying your space heating and DHW needs does not need to take up a lot of space. The tankless water heater included with the P-WTGO-3 does not inflate the size of the unit; it enjoys the same compact size as comparable Weil-McLain WGO boilers.
Product Includes
  • (1) Weil-McLain P-WTGO-3 Hot Water Boiler
  • (1) Weil-McLain 590-921-612 Tankless Water Heater
  • (1) Draft Damper
  • (1) Taco 007 Circulator
Product Note
This boiler does not include an oil burner. Please see the Accessories tab for compatible burners if you require one.
Product Note
This boiler does not include an oil burner. Please see the Accessories tab for compatible burners if you require one.
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General Information
Product Line
Medium Learn More
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
Hot Water
Heat Exchanger Material
Cast Iron
Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Combustion Type Learn More
Combustion Type
Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.
Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
Chimney Vent
DHW Production Learn More
DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.
Modulating/Staging Learn More
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control.
Single Stage
Mount Type
Maximum Altitude
2000 Feet
Includes Pump
Assembly Type
Burner Model
Sold Separately
AFUE Learn More
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace.
85 %
Input Rate
0.95 GPH
DOE Heating Capacity Learn More
DOE Heating Capacity
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
115000 BTU
Net I=B=R Capacity Learn More
Net I=B=R Capacity
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.
100000 BTU
Electrical Data
60 Hz
Flue Connection Size
6 Inches
Supply Connection
1 1/4 Inches
Return Connection
1 1/2 Inches
Product Height
35 5/8 Inches
Product Width
20 1/4 Inches
Product Depth
16 7/8 Inches
Product Weight
595 Pounds
Shipping Width
23 Inches
Shipping Height
39 Inches
Shipping Depth
27 Inches
Shipping Weight
605 Pounds
Country of Origin
United States
CSA Listed
Energy Star Listed
ASME Certified
AHRI Certified
AHRI Reference Number
Warranty Information
Parts Warranty Show ACW Parts Warranty Learn More
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
2 Years
Heat Exchanger Warranty
20 Years
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Weil-McLain P-WTGO-3 115,000 BTU 85.3% AFUE Hot Water Oil Boiler
Weil-McLain P-WTGO-3
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