Steam Boilers

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Steam boilers are common in many parts of the country and have been a very popular heat source for decades because of the steam's ability to heat uniformly. Steam boilers are fueled by gas or oil, are either chimney vented or power vented, and are manufactured by some of the biggest brands in the industry.

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Weil-McLain (58)

Burnham (34)

Crown Boiler Co. (56)

ProSelect Force Boilers (6)

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.

30000 - 89999 (45)

90000 - 149999 (47)

150000 - 209999 (26)

210000 - 269999 (8)

270000 - 329999 (3)

390000 - 449999 (1)

450000 - 509999 (1)

510000 - 569999 (1)

630000 - 689999 (1)

690000 - 749999 (1)

750000 - 809999 (1)

810000 - 869999 (1)

930000 - 989999 (1)

990000 - 1049999 (1)

1110000 - 1169999 (1)

1170000 - 1229999 (1)

1290000 - 1349999 (1)

1350000 - 1409999 (1)

1470000 - 1529999 (1)

1530000 - 1589999 (1)

1590000 - 1649999 (1)

1710000 - 1769999 (1)

1770000+ (1)

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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.

50000 - 109999 (31)

110000 - 169999 (44)

170000 - 229999 (29)

230000 - 289999 (15)

290000 - 349999 (7)

350000 - 409999 (2)

410000 - 469999 (1)

470000 - 529999 (1)

590000 - 649999 (1)

710000 - 769999 (1)

830000 - 889999 (1)

890000 - 949999 (1)

1010000 - 1069999 (1)

1130000 - 1189999 (1)

1250000 - 1309999 (1)

1310000 - 1369999 (1)

1430000 - 1489999 (1)

1550000 - 1609999 (1)

1670000 - 1729999 (1)

1790000 - 1849999 (1)

1850000 - 1909999 (1)

1970000 - 2029999 (1)

2090000 - 2149999 (1)

2210000 - 2269999 (1)

2270000+ (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.

60000 - 249999 (66)

250000 - 439999 (22)

440000 - 629999 (5)

630000 - 819999 (2)

820000 - 1009999 (1)

1010000 - 1199999 (2)

1200000 - 1389999 (1)

1390000 - 1579999 (2)

1580000 - 1769999 (1)

1770000 - 1959999 (2)

1960000 - 2149999 (1)

2150000 - 2339999 (1)

2340000 - 2529999 (2)

2530000 - 2719999 (1)

2720000+ (2)

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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 (27)

82 (75)

83 (16)

84 (5)

85 (10)

86 (8)

Efficiency (%)

77 (3)

82 (3)

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 (149)

Power Vent (4)

Fuel Type

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

Liquid Propane (19)

Natural Gas (92)

Oil (42)

Product Line

Bermuda (25)

EG (15)

EGH (9)

Force (6)

Freeport (14)

Independence (26)

Independence PV (4)

Kingston (17)

LGB (20)

MegaSteam (4)

PEG (6)

SGO (7)

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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.

Available (22)

No (109)

Yes (16)

Weil-McLain P-SGO-4 - 108K BTU - 84.0% AFUE - Steam Oil Boiler - Chimney Vent - Burner Sold Separately

Model: 386700820

Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 1.20 GPH Gross Input, 144K BTU DOE Capacity, 108K BTU Net IBR Capacity.

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Q&A (1)

$2,600.09

Only 1 In-Stock

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.