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Weil-Mclain 386-701-000 SGO-3 133 Input MBtu 85% AFUE Cast Iron Oil-Fired Steam Boiler with Tankless Heater Option Series 4 - Chimney Vent (Burner Sold Separately)

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Product details

Weil-Mclain 386-701-000 SGO-3 133 Input MBtu 85% AFUE Cast Iron Oil-Fired Steam Boiler with Tankless Heater Option Series 4 - Chimney Vent (Burner Sold Separately)

  • 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 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
  • 85% AFUE
  • Available assembled or as a knockdown for installation areas with limited space




  • Factory tested and assembled cast iron section assembly (jacket and collector hood are not assembled on 7, 8 and 9 section blocks)
  • Insulated steel jacket
  • Aluminized steel flue collector hood with flue cap on top outlet (convertible to rear outlet)
  • Swing-away burner mounting door
  • Refractory blanket and target wall in combustion area
  • Tankless heater opening cover plate
  • Electrical junction box with wiring harnesses
  • Junction box cover plate with service switch
  • Two vent pipe brackets
  • Drain valve
  • Barometric damper
  • Oil vent damper
  • High limit pressure control
  • Low water cutoff; Packaged units only (float or probe type)
  • 15 PSI ASME relief valve
  • Steam pressure gauge
  • Siphon
  • Gauge glass, cocks and guard


  • High-efficiency flame-retention Oil Burner (Beckett AFG, Carlin EZ or Riello). Specify 2-stage fuel unit (optional, Beckett) if required.
  • Tankless heaters and controls
  • Low water cutoffs (float or probe type)
  • Weil-McLain five- and ten-year homeowner protection plan
  • Weil-McLain indirect-fired water heaters


  • Residential: 10 Years Heat Exchanger; 2 Years Parts
  • Commercial: 10 Years Heat Exchanger; 1 Year Parts
See All Weil-McLain Products

Specification Sheet

Basic Information
MPN ? Manufacturer Part Number 386-701-000
UPC / GTIN 672619219427
Manufacturer Weil-McLain
Series ? A manufacturer's grouping of items that match, coordinate, or complement each other. SGO Series 4
Dimensions and Measurements
Weight ? Weight 600.00
BTU Input 133,000
AFUE 85%
Height (Inches) ? The vertical measurement from bottom to top, measured in inches. 35-5/8"
Length (Inches) ? The distance of the product's longest side, measured in inches. 16-7/8"
Characteristics and Features
Material ? The material(s) used in the construction of the product. Cast Iron
Boiler Type Residential
Fuel Type Oil
Venting Chimney Vent
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