Manifold Assembly Kit With Gas Proportional Valve (For NAT)

Rheem RTG20329D Manifold Assembly Kit with Gas Proportional Valve – OEM Replacement for Tankless Systems

The Rheem RTG20329D manifold assembly kit is an OEM component designed specifically for Rheem tankless gas water heaters. This kit includes a factory-calibrated gas proportional valve and associated manifold hardware to ensure accurate fuel-air mixture control, essential for maintaining consistent combustion and thermal efficiency.

Engineered for natural gas systems, this replacement assembly restores original performance characteristics and complies with Rheem’s factory specifications. It is a critical part for service technicians and installers tasked with diagnosing inconsistent burner operation, fluctuating outlet temperatures, or ignition irregularities in compatible Rheem models.

Product Features

• OEM-Calibrated Gas Proportional Valve – Provides precise modulation of gas input to match demand and maintain system efficiency.
• Natural Gas Application – Designed for use in natural gas-fired Rheem tankless water heaters; not intended for conversion to or from LP gas.
• Direct Replacement – Designed to replace the existing manifold assembly with no modifications required when used with specified models.
• Component Integrity – Manufactured using corrosion-resistant metals and factory-tested for tolerance, pressure rating, and performance under load.

Compatibility & Use

• Part Number: RTG20329D
• Compatible Systems: Select Rheem RTG-series tankless natural gas water heaters
• Fuel Type: Natural Gas only (not convertible)
• Installation: Requires professional service tools and diagnostic confirmation of failure prior to replacement

Installation Notes

This manifold assembly should be installed only by qualified technicians familiar with tankless water heater servicing. System must be depressurized and de-energized prior to disassembly. Following installation, combustion testing and gas leak checks are required to ensure operational safety and regulatory compliance. Installation in accordance with Rheem technical bulletins and the original I&O manual is mandatory to preserve warranty coverage.

Contractor Considerations

• Designed for straightforward drop-in replacement using existing mounts and connection points.
• Valve calibration is not field-adjustable; do not attempt to modify or retrofit outside of designated model series.
• Use in preventive maintenance or during burner system repairs to restore gas modulation accuracy and correct fluctuating output temperatures.
• Ensure system firmware or controls are updated as required when replacing major gas path components.

The Rheem RTG20329D manifold assembly is a purpose-built, model-specific component for restoring combustion control performance in compatible Rheem tankless natural gas water heaters. For optimal results and safe operation, replacement should be handled by licensed professionals trained in water heater diagnostics and combustion system repair.