Rheem IKONIC SR 8.4 GPM 157,000 BTU Natural Gas Indoor Condensing Tankless Water Heater with Integrated Recirculation Pump (.96 UEF)

High-Efficiency Tankless Water Heater Delivering 8.4 GPM

The Rheem IKONIC SR Series Tankless Water Heater provides high-efficiency on-demand hot water with a maximum gas input of 157,000 BTU/h, a maximum flow rate of 8.4 GPM at a 35°F temperature rise, and a 0.96 Uniform Energy Factor (UEF).

Designed for indoor installation and retrofit applications, the unit supports PVC vent runs up to 70 feet with 2-inch venting or 150 feet with 3-inch venting. It also supports flex venting through existing B-vent up to 50 feet and features a full-text digital display without dip-switches.

Product Features:

• 157,000 BTU/h Maximum Gas Input: Provides heating capacity for on-demand hot water applications.
• 8.4 GPM Maximum Flow Rate: Delivers up to 8.4 GPM at a 35°F temperature rise.
• 0.96 UEF: Provides high-efficiency operation.
• Stainless Steel Heat Exchangers: Primary and secondary stainless steel heat exchangers support durability and efficient heat transfer.
• Built-In Recirculation Pump and Hot-Start Programming™: The SR model's recirculation pump helps deliver hot water at the tap, while Hot-Start Programming™ helps minimize cold water bursts between back-to-back uses.

Understanding Tankless Water Heater Sizing

The RECTGH-SR84iP provides a maximum flow rate of 8.4 GPM at a 35°F temperature rise. At a 45°F temperature rise, the maximum flow rate is 6.9 GPM, while a 67°F temperature rise provides a maximum flow rate of 4.6 GPM.

Flow capacity varies based on incoming groundwater temperature and the desired water temperature. At a 120°F unit setting and a mixed shower temperature of 105°F, the rated flow capacity ranges from 3.7 to 7.2 GPM across groundwater temperatures of 37°F to 77°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 SR84iP 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): 0.96
• Maximum Flow Rate: 8.4 GPM at a 35°F temperature rise
• Gas Input: Up to 157,000 BTU/h
• Built-In Recirculation Pump: Provides faster hot water delivery and helps reduce water waste.

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 IKONIC SR84i tankless water heater with built-in recirculation pump
• Brass service valves
• Pressure relief valve
• LP to NG gas conversion kit
• 5-foot, 120V, 3-prong power cord
• Mounting and spare-parts kit
• Vent screens
• Use and care manual

Requirements & Considerations

• Fuel Type: Factory-configured for liquid propane (LP) and includes a natural gas (NG) conversion kit for qualified field installation.
• Installation Type: Indoor installation. The outdoor conversion kit is sold separately.
• Venting: Use approved vent materials and configurations according to Rheem's installation instructions.
• Gas, Water & Condensate Connections: Follow the installation manual for connection sizes and requirements.
• Clearances: Maintain the clearances specified in the installation manual for safe operation and service access.
• Wi-Fi: Standard included feature for the SR84i model.
• Recirculation: The built-in recirculation pump supports selectable operating modes. Follow Rheem's installation instructions for setup and operation.