Rheem RTG 9.5 GPM 199,900 BTU Natural Gas Outdoor Non-Condensing Tankless Water Heater (.82 UEF)

High-Efficiency Outdoor Natural Gas Tankless Water Heater Delivering 9.5 GPM

The Rheem RTG Series RTG-95XLN-3 is a high-efficiency, outdoor non-condensing natural gas tankless water heater designed to deliver dependable on-demand hot water with a maximum gas input of 199,900 BTU/h, a maximum flow rate of 9.5 GPM at a 35°F temperature rise, and a 0.82 Uniform Energy Factor (UEF).

Engineered for outdoor installation, this compact unit eliminates the need for indoor venting and features an enhanced profile that is up to 10% smaller and 22% lighter than previous generations for easier handling. It includes an external digital remote control, a built-in digital display, and 1/2-inch gas line compatibility for seamless replacement applications.

Key Benefits

• High Heating Capacity: Delivers up to 199,900 BTU/h maximum gas input to support high-demand residential hot water applications.
• On-Demand Hot Water: Provides up to 9.5 GPM at a 35°F temperature rise. Actual flow rate varies with incoming water temperature and selected output temperature.
• Hot-Start Programming™: Rheem-exclusive programming keeps the unit in a ready state between back-to-back hot water uses to minimize cold water bursts.
• Space-Saving Outdoor Design: Built specifically for exterior mounting, freeing up interior utility space and removing the need for dedicated flue venting.
• Compact & Lightweight Profile: Enhanced cabinet design is up to 10% smaller and 22% lighter to simplify one-person installation.
• Retrofit-Friendly Clearances: Industry-best 1/2-inch side-to-side clearance allows for safe placement in tight exterior spaces.
• 1/2-Inch Gas-Line Compatibility: Accommodates 1/2-inch gas supply lines where permitted by local plumbing codes.
• Low NOx Compliance: Meets strict 14 ng/J NOx requirements and is SCAQMD Rule 1146.2 compliant.

Understanding Tankless Water Heater Sizing

The RTG-95XLN-3 provides a maximum flow rate of 9.5 GPM at a 35°F temperature rise. At a 45°F temperature rise, the maximum flow rate is 7.4 GPM, while a 67°F temperature rise provides a maximum flow rate of 5.0 GPM.

Flow capacity varies based on incoming groundwater temperature and the desired hot water temperature. The unit's flow-rate capacity ranges from 3.3 to 9.5 GPM based on standard temperature rises from 35°F to 100°F.

How to Calculate Temperature Rise

To determine temperature rise, subtract the incoming water temperature from your desired hot water temperature. For example, if the incoming water temperature is 55°F and the desired water temperature is 120°F:

120°F - 55°F = 65°F Temperature Rise

Refer to the Water Flow (GPM) chart below to compare estimated flow rates at different temperature rises and determine whether the Rheem RTG-95XLN-3 model can meet your household's hot water demand. Actual flow rates vary depending on incoming water temperature and the selected water heater temperature.

Energy Efficiency & Performance

• Uniform Energy Factor (UEF): 0.82
• Maximum Flow Rate: 9.5 GPM at a 35°F temperature rise
• Gas Input: 11,000 up to 199,900 BTU/h
• Activation Flow Rate: 0.4 GPM (0.26 GPM minimum continuous flow)

Actual hot water flow depends on the incoming water temperature and the required temperature rise.

Warranty

Rheem provides a 15-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty for single-family residential installations.

Important Warranty Conditions:

• Residential Use: Standard residential installations qualify for full coverage. Commercial installations receive 5-year heat exchanger and parts coverage.
• Recirculation Systems: Controlled recirculation qualifies for full residential coverage. Uncontrolled, continuously operating recirculation reduces heat exchanger and parts coverage to 3 years.
• Operating Hours: All warranty coverage ends after 12,000 hours of operation.
• Installation & Maintenance: Damage from improper installation, mineral buildup, scale, or water quality outside Rheem's specified limits is excluded.
• Labor Coverage: Covers reasonable labor costs for covered repairs during the first year when performed by a licensed, qualified contractor trained on Rheem tankless water heaters.
• Ownership: Warranty applies only to the original owner at the original installation location and is nontransferable.

Warranty coverage begins on the documented installation date. Without documentation, coverage begins 90 days after manufacture. Product registration does not extend the warranty period.

Review Rheem's official Limited Warranty Certificate for complete terms, exclusions, and coverage details.

What's Included

• Rheem RTG-95XLN-3 Outdoor Tankless Water Heater
• External digital remote control
• Factory-installed power cord
• Hanging mounting bracket

Requirements & Considerations

• Fuel Type: Configured for Natural Gas. (Propane alternative models available separately).
• Installation Type: Outdoor installation only. No venting required.
• Gas, Water Connections: 3/4-inch NPT gas, hot water, and cold water connections.
• Electrical Requirements: 120V, 60Hz power supply (85W normal operation, 132W anti-freeze protection draw).
• Clearances: Maintain 12 inches top/bottom, 1/2 inch sides, 1/2 inch front, and 0 inches back clearance for safe operation and service access.
• Controls: Includes an external remote control and built-in digital display.