Rinnai RU199I Lp to Ng Fuel Conversion Kit Tankless

Product Description

The RINNAI RU199I fuel conversion kit provides all components required to convert 199-size indoor tankless water heaters from liquid propane to natural gas operation. The kit includes a calibrated orifice set, conversion regulator components, screws, seals, and natural gas configuration labeling for appliance documentation. The hardware is engineered to match the combustion-air settings, burner geometry, and modulation logic of the 199-class tankless platform, maintaining correct gas-air ratios across the full firing range. Licensed gas technicians perform this conversion as part of a fuel-source change or service upgrade on qualifying indoor units.

This kit is designed for indoor residential tankless installations where the gas supply is being changed from liquid propane to natural gas. Compatible units include the RU199i, RUR199i, and CU199i models. The conversion addresses the full combustion system requirements for these 199-class units, including inlet pressure compatibility, burner operation, and modulation performance under natural gas supply. Technicians must verify that inlet pressure, venting configuration, and gas supply capacity meet natural gas requirements before and after conversion.

Key Features

• Converts 199-class indoor tankless units from liquid propane to natural gas
• Includes calibrated orifice set matched to 199-class burner geometry
• Conversion regulator components, screws, and seals included in kit
• Natural gas configuration labeling included for appliance documentation
• Engineered to maintain stable ignition and accurate modulation across full firing range
• Matches factory combustion-air settings for proper gas-air ratios

Compatibility

Compatible with Rinnai RU199i, RUR199i, and CU199i indoor tankless water heater models. Verify unit model designation before ordering. This kit is not intended for outdoor-rated or non-199-class units.

Installation Notes

Installation must be performed by a licensed gas technician in accordance with local codes and the manufacturer conversion instructions. Shut off the gas supply and disconnect power to the unit before beginning any conversion work. After completing the conversion, verify inlet gas pressure, venting integrity, and gas supply capacity meet natural gas specifications before returning the unit to service. The appliance label must be updated with the supplied natural gas configuration labeling at the time of conversion.

Technical Specifications

• Fuel Conversion Direction: Liquid Propane to Natural Gas
• Compatible Platform: 199-class indoor tankless units
• Kit Contents: Calibrated orifice set, conversion regulator components, screws, seals, NG configuration labeling

Standard Information

• Brand: RINNAI
• Manufacturer Part Number: RU199I