Rinnai RE199iN 9.8 GPM 199,000 BTU Non-Condensing Tankless Water Heater (Natural Gas)

Rinnai RE199iN 9.8 GPM 199,000 BTU Non-Condensing Tankless Water Heater (Natural Gas)

The Rinnai RE199iN is a high-performance 199,000 BTU non-condensing tankless water heater designed for whole-home hot water. Delivering up to 9.8 GPM, this indoor natural gas model provides continuous hot water for medium to large homes. Its reliable build, simple venting options, and long service life make it a strong choice for homeowners and installers looking for efficiency without the complexity of a condensing system.

Part of Rinnai’s High Efficiency non-condensing lineup, the RE199iN features an efficient heat exchanger design, Ultra Low NOx emissions, and a compact wall-mounted form factor. It is ideal for replacing traditional tank heaters or upgrading from older tankless units.

Key Features

• 9.8 GPM max flow rate — supports multiple fixtures running at the same time.
• 199,000 BTU high-output burner for strong, reliable hot water supply.
• Non-condensing design with simplified venting requirements.
• Natural Gas model engineered for residential indoor installation.
• Ultra Low NOx emissions for cleaner operation.
• Wi-Fi Smart Connect™ compatible for remote monitoring and system diagnostics.
• Durable heat exchanger designed for long service life.
• Compact wall-mounted design frees up valuable space.

Ideal Applications

• Medium to large homes needing continuous hot water
• Multiple bathrooms and simultaneous showers
• Upgrading from older tankless units or large tank heaters
• Homes requiring a simpler venting configuration (non-condensing)

Performance & Efficiency

• Flow Rate: Up to 9.8 GPM (varies by temperature rise)
• BTU Input: 15,000 – 199,000 BTU/h
• Uniform Energy Factor (UEF): ~0.81 (non-condensing)
• Temperature Range: Up to 120°F standard; up to 140°F with settings
• Fuel Type: Natural Gas

Technical Specifications

Benefits for Homeowners

• Endless hot water for larger families and multi-bath homes.
• Simpler venting compared to condensing systems.
• Lower operating cost than traditional tank heaters.
• Cleaner combustion with Ultra Low NOx output.
• Smaller footprint frees up space in utility rooms or garages.

Installation Notes

• Requires adequate gas supply (ensure correct line sizing).
• Indoor installation only.
• Non-condensing venting must meet local code requirements.
• Professional installation is recommended for best performance.

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