Weil-McLain WGO Oil Boiler Overview

The Weil-McLain WGO is a high efficiency, cast iron oil-fired boiler. The WGO has a cast iron heat exchanger and an insulated steel jacket. The unit has a refractory blanket and target wall in the combustion area. The WGO features a quick-open top and a swing-away burner mounting door for easier access and visibility for inspection and servicing. WGO models range in AFUE rating from 85.0% to 87.0%, and certain models are Energy Star compliant when reducing the burner rate and installing the optional vent damper kit.

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Consumer Reviews of Weil-McLain WGO Oil


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #3 of 10 Weil-McLain Boiler
  • 37.5% of customers recommended

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Weil-McLain WGO Oil Boiler Reviews

Showing 6-8 of 8 reviews

""Gold" boiler an utter failure after only 15 years"

1.0 rating
Very Unsatisfied

Our Weil McLain wgo-3 has failed after only 15 years. One of the castings on the internal boiler core must have been cast improperly because it's covered with rust on the outside and water is seeping through the metal itself. Of course, Weil McLain is honoring the "limited" warranty and crediting us something towards the part itself, but nothing towards the labor. All told, we'll be out $3,000. Everything made these days is just crap, and it's pretty infuriating.

Frustrated Weil-McLain owner

North Shore, MA

"Ignition, Burner Primary Control"

2.0 rating
Somewhat Unsatisfied

The WGO/WTGO Series Burner Primary Control buttons have to be replaced every 2/3 yrs. @ $250.00 High maintenance.


Susquehanna PA

"Great furnace"

5.0 rating
Very Satisfied

Have had a Weil-Mcclain wgo Gold oil fired furnace for 8 years now. No problems whatsoever. Minimal, easy maintenance, quiet, highly efficient.

Brian S.

Southern New Hampshire

Other WGO Oil Reviews

In a comparison on hvac-talk.com between the WGO and the System 2000, the choices between the two boilers were quite evenly divided. In another thread on hvac-talk.com, a consumer was considering updating to a different boiler and was advised to stay with the WGO, as it is a good unit. A member on terrylove.com commented that the WGO was using a lot of oil, and another member suggested that he only change the burner because the WGO is a good unit.

WGO Oil Warranty

The Weil-McLain WGO oil boiler is covered by a 20-year heat exchanger and 2-year parts warranty. Labor costs are not covered under the warranty. Registration is not required to activate the warranty, but proof of purchase and the installation date should be retained.

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