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Product Type:

oil-fired residential

WGO Oil Boiler
Where to Buy
Contact us today to obtain a contractor or distributor in your area.
  • Dedicated water-only oil boiler with cast iron sections - no tankless heater or cover plate
  • 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
  • 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


Model     Burner Cap (GPH)DOE Heating Capacity (MBH)Net AHRI Ratings (MBH)Min. Chimney SizeAnnual Fuel Utilization
Efficiency (AFUE)
WGO-2RD0.7086758 x 887.0*
WGO-20.7086758 x 886.4
WGO-3RD0.8098858 x 887.0*
WGO-30.951151008 x 885.3
WGO-4RD1.001231078 x 887.0*
WGO-41.201451268 x 885.0
WGO-5RD1.201481298 x 887.0*
WGO-51.451751528 x 885.0
WGO-6RD1.401731508 x 887.0*
WGO-61.752121848 x 885.0
WGO-7RD1.601971718 x 887.0*
WGO-72.002422108 x 885.0
WGO-82.302662318 x 12--
WGO-92.552952578 x 12--
*ENERGY STAR®compliant with Version 3.0 Boiler Specification of 87% AFUE only when installed at the reduced burner rate (R) and with the optional vent damper kit (D). Burners shipped with standard rate nozzle, reduced rates achieved through nozzle change - refer to burner instructions or boiler's rating label for correct selection.