Aqua Balance 640000025 Conversion Kit, For use with for AquaBalance 120 MBH Model Boilers

Product Overview

The Weil-McLain 640-000-025 LP Conversion Kit is a factory-authorized component designed for converting AquaBalance Series 120 MBH wall-mounted gas-fired water boilers from natural gas to liquid propane (LP) operation. This kit includes all necessary components for safe and code-compliant fuel type conversion, maintaining manufacturer performance and combustion specifications. Engineered for use with both the AB-120C (combi) and AB-120H (heat-only) models, it ensures consistent operation under propane fuel conditions while preserving boiler efficiency and warranty compliance.

Technical Specifications

• Manufacturer: Weil-McLain
• Model Number: 640-000-025
• Description: LP Gas Conversion Kit for AquaBalance Boilers
• Reference Number: 2002238
• Kit Type: Natural Gas to LP (Propane) Conversion Kit
• Application: Fuel system conversion for AquaBalance 120 MBH gas-fired water boilers
• Compatible Models:
  • AquaBalance AB-120C (Combi Boiler)
  • AquaBalance AB-120H (Heat-Only Boiler)
  • AquaBalance Series 1/2 Boilers
• Boiler Type: Wall-mounted, gas-fired, condensing water boiler
• Fuel Conversion: Natural Gas to Liquid Propane (LP)
• Included Components:
  • LP orifice kit and gaskets
  • Conversion identification labeling
  • Installation instructions
  • Adjustment and verification documentation
• Operating Pressure Range: Factory-calibrated for standard LP system inlet pressures
• Maximum Input Capacity: 120 MBH (thousand BTU/hr)
• Installation Requirements:
  • Performed by a qualified technician per Weil-McLain instructions
  • Requires combustion analysis and verification after installation
  • Must comply with all local fuel gas and mechanical codes
• Material Composition: Brass, steel, and polymer components as required for fuel adaptation
• Function: Adjusts combustion air/fuel mixture and burner operation for propane gas characteristics
• Operating Environment: Indoor hydronic heating installations
• Compliance:
  • Certified to applicable ANSI Z21.13 and CSA 4.9 standards when properly installed
  • Meets manufacturer and local regulatory code requirements for LP conversions
• Country of Manufacture: United States

Summary

The Weil-McLain 640-000-025 LP Conversion Kit is a natural-to-LP gas conversion package for AquaBalance 120 MBH wall-mounted boilers. Compatible with AB-120C and AB-120H models, it includes factory-calibrated components for proper fuel conversion, maintaining manufacturer-rated combustion efficiency and system performance in professional hydronic heating applications.