Rinnai RE199IN 9.8 GPM 199,000 BTU Indoor Non-Condensing Tankless Water Heater

End the hot water wait without sacrificing space or efficiency. The Rinnai RE199IN (trade model RE199iN) delivers up to 9.8 GPM of continuous hot water with a 199,000 BTU burner and a 0.82 UEF, making it well-suited for multi-fixture households. Designed for indoor installation, it uses a compact 3″/5″ concentric vent system and plugs into a standard 120V outlet. A built-in temperature controller simplifies adjustments, while optional Wi-Fi connectivity allows remote monitoring and control.

• Brand: Rinnai
• MPN: RE199IN (trade model RE199iN)
• Type: Indoor non-condensing tankless water heater (natural gas)
• Input: 10,400–199,000 BTU/h modulating
• Flow Rate: Up to 9.8 GPM
• Efficiency: UEF 0.82
• Activation Flow: 0.4 GPM
• Temperature Range: 98–140°F (up to 185°F with optional controller)
• Connections: 3/4″ NPT gas, cold inlet, and hot outlet
• Venting: 3″/5″ concentric vent system
• Electrical: 120V AC, 60 Hz (plug-in)
• Dimensions: 27.3″ H × 14.05″ W × 11.2″ D
• Weight: 42.1 lb
• Included: Integrated temperature controller, approximately 5 ft power cord
• Certifications: AHRI certified; ANSI Z21.10.3 / CSA 4.3 compliant; mobile home approved; ultra-low NOx
• Warranty: 15-year heat exchanger (or 12,000 hours), 5-year parts, 1-year labor (residential)

Energy-Efficient Operation

With a 0.82 Uniform Energy Factor, the RE199IN heats water only when needed, eliminating standby heat loss associated with traditional tank systems. Advanced flow control helps maintain consistent outlet temperatures while reducing overall energy consumption.

Consistent Hot Water Performance

The 199,000 BTU modulating burner adjusts output based on demand, delivering up to 9.8 GPM for simultaneous use across multiple fixtures. A low activation flow of 0.4 GPM ensures hot water delivery even during low-demand usage.

Durable Design and Easy Maintenance

The unit includes a cleanable inlet water filter and supports routine flushing for scale management, helping extend service life in hard water conditions. Operating sound levels around 54 dB help maintain a quiet environment.

Installer-Friendly Setup

Standard 3/4″ NPT water and gas connections simplify installation. The indoor unit plugs into a standard 120V outlet, and approved 3″/5″ concentric venting supports flexible installation layouts.

Compact, Space-Saving Design

Measuring 27.3″ H × 14.05″ W × 11.2″ D, the RE199IN mounts on the wall to free up floor space, making it suitable for closets, utility rooms, and basements.

Smart Control Options

The integrated controller allows on-unit temperature adjustments, while optional Wi-Fi (Control-R module) enables remote monitoring, scheduling, and alerts for added convenience.

Code-Compliant and Versatile

The RE199IN is AHRI certified and meets ANSI Z21.10.3 / CSA 4.3 standards. It is approved for installation in manufactured homes and designed with ultra-low NOx emissions to meet strict air quality requirements.