Weil-McLain®, 383-500-390, Gas Valve Kit

Weil-McLain 383-500-390 Gas Valve and Venturi Assembly for Ultra 299 Boilers

The Weil-McLain 383-500-390 Gas Valve Kit is an OEM replacement component for Ultra Series 299 gas-fired condensing boilers. This kit includes a gas valve and Venturi assembly engineered to regulate combustion airflow and gas input with precision, supporting consistent burner performance and safe operation.

Designed specifically for use with the Ultra 299 model, this assembly maintains factory calibration standards for gas-to-air ratio and is essential for restoring or maintaining boiler efficiency. Ideal for service calls, repairs, or preventive maintenance on existing installations using the Ultra platform.

Included Components

• Gas Valve: Electronically controlled valve compatible with original control system
• Venturi: Sized and matched to boiler burner specifications

Product Applications

• Boiler Compatibility: Weil-McLain Ultra Series, Model 299 only
• Fuel Type: Natural gas
• Use Case: OEM replacement during service or system restoration

Installation Information

This kit must be installed by a qualified HVAC or plumbing technician experienced with gas-fired boiler systems. Proper calibration and leak testing are required after installation. The gas valve and Venturi are critical to burner modulation and combustion control—incorrect installation may affect safety and performance.

Contractor Notes

The 383-500-390 kit is factory-approved and should be used only on Weil-McLain Ultra 299 boilers. Always verify model and serial number compatibility before installation. When replacing this assembly, ensure all control wiring and gas piping meet original specifications and local code requirements. Recommission the unit per Weil-McLain’s service procedures following installation.