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DOE Heating Capacity (BTU)

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.

30000 - 179999 (134)

180000 - 329999 (24)

330000 - 479999 (8)

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Net I=B=R Capacity (BTU)

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.

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190000 - 359999 (14)

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2400000+ (1)

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Maximum Input Capacity (BTU)

The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.

30000 - 239999 (116)

240000 - 449999 (11)

450000 - 659999 (9)

660000 - 869999 (4)

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1080000 - 1289999 (3)

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1920000 - 2129999 (7)

2130000 - 2339999 (2)

2340000 - 2549999 (5)

2550000 - 2759999 (4)

2760000 - 2969999 (2)

2970000+ (1)

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AFUE (%)

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. Learn More

81 (40)

82 (9)

83 (2)

84 (93)

85 (8)

86 (20)

87 (3)

91 (5)

92 (1)

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96 (1)

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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 (164)

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Medium

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 (199)

Hot Water/Steam (9)

Steam (45)

Fuel Type

To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.

Indirect Fired (8)

Liquid Propane (70)

LP to NG (7)

Natural Gas (218)

NG to LP (19)

Oil (71)

Modulating/Staging

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. Learn More

Modulating (38)

Staging (179)

Brand

Weil-McLain (679)

Weil-McLain WTGO-5 - 147K BTU - 86.1% AFUE - Hot Water Oil Boiler - Chimney Vent - Burner Sold Separately

Model: 386701035

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$3,970.00

Factory-Direct

Free Shipping & Lift Gate

*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.

2% Check Discount

Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.

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Weil-McLain EG - Boiler Base Box

Model: 381800827

Weil-McLain - Boiler Base Box - for EG-30 Boilers - 381800827

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$210.00

In-Stock

Free Shipping & Lift Gate

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Weil-McLain Oil Burner for GO-6 - EZ-2 - 1.75 GPH - Chimney Vent

Model: 386700440

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$597.00

Factory-Direct

Free Shipping

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Weil-McLain Oil Burner for WGO-2 - EZ-1 - 0.7 GPH - Chimney Vent

Model: 386700424

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$597.00

Factory-Direct

Free Shipping

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Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent

Model: 383500736

Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 230K BTU Gross Input, 207K BTU DOE Capacity, 183K BTU Net IBR Capacity. Includes Circulator.

(2)

$4,978.00

Est. Availability

Estimated Availability

Secure your place in line to receive this item once the manufacturer has provided us new inventory. Keep in mind orders are fulfilled in the order they are received. If you wish to no longer wait on the item, you are more than welcome to cancel the order. However, please keep in mind you will lose your place in line.

12-16 Weeks

Free Shipping & Lift Gate

2% Check Discount

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Weil-McLain LGB-6-S - 395K BTU - 81.0% Combustion Efficiency - Steam Gas Boiler - Chimney Vent

Model: 133064304

Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 650K BTU Gross Input, 527K BTU DOE Capacity, 395K BTU Net IBR Capacity.

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Q&A (1)

$10,307.00

Backordered

Est. Ship Date Dec 29

Free Shipping & Lift Gate

2% Check Discount

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Weil-McLain LGB-9-S - 632K BTU - 81.0% Combustion Efficiency - Steam Gas Boiler - Chimney Vent

Model: 133094304

Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1,040K BTU Gross Input, 842K BTU DOE Capacity, 632K BTU Net IBR Capacity.

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Q&A (1)

$14,358.00

Backordered

Est. Ship Date Sep 30

Free Shipping & Lift Gate

2% Check Discount

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Weil-McLain has been producing durable, American-made boilers for over a century. Their lineup of boilers spans a massive range of capacities and efficiencies with gas-fired and oil-fired options. Shop now for Weil-McLain.