Weil McLain 521-100-042 Beckett Oil Burner for 4-Section WGO/SGO/WTGO Boilers

The Weil-McLain 521-100-042 is a genuine OEM Beckett oil burner engineered specifically for Weil-McLain 4-section GO-series oil boilers, including the WGO-4, WTGO-4, and SGO-4 models. Supplied as model WL7604, this burner is certified to operate on #2 fuel oil as well as up to 100% biodiesel (B100), making it a forward-compatible solution for homeowners and contractors looking to reduce their carbon footprint without sacrificing reliable heat output.

As a direct replacement burner from Weil-McLain, this unit is built to factory specifications and integrates seamlessly with the 4-section boiler configuration. The Beckett platform is one of the most widely trusted oil burner platforms in the residential and light-commercial heating industry, known for consistent ignition, efficient combustion, and long service life.

Key Features:

• Genuine OEM Weil-McLain replacement oil burner
• Beckett model WL7604 — engineered for GO-4 series boilers
• Compatible with #2 fuel oil and B100 biodiesel
• Designed for 4-section Weil-McLain WGO, WTGO, and SGO oil boilers
• Cross-reference OEM part number: 386-700-404
• Delivers consistent, efficient combustion performance
• Professional installation recommended

This burner is the correct factory-specified replacement for Weil-McLain GO-4 boiler installations and should be installed by a licensed HVAC technician in accordance with all applicable local codes and manufacturer guidelines.

OEM Cross-Reference: 521-100-042 replaces 386-700-404