11.1 GPM 199,000 BTU Condensing Tankless Water Heater

The RX199iN is Rinnai's condensing, natural-gas tankless water heater, sized for homes that want a high-output, continuous hot-water supply without a storage tank. It installs indoors or outdoors and mounts to the wall.

It is rated for a maximum input of 199,000 BTU and flow up to 11.1 GPM, with a listed efficiency of 0.98 UEF. The unit runs on 120-volt power. The cabinet measures 30.11 inches high, 18.5 inches wide, and 11.4 inches deep, and weighs 55 pounds.

Installation requires a direct-vent connection at a 2-inch minimum diameter. Rinnai's Smart Sense gas control system and the Rinnai Central app support setup, service, and troubleshooting over Bluetooth. Quick Flush simplified flushing and Versa Vent outdoor vent adapter lime detection are built in, and recirculation is field convertible with an internal pump kit. The unit is Energy Star certified and suited to outdoor conversion with the Versa Vent adaptor, sold separately. A qualified installer should confirm clearances, gas-line sizing, and local code before the unit is mounted.

This listing is for the water heater itself. Gas piping, electrical connections, mounting hardware, and venting materials are not included unless stated.

Rinnai's limited warranty covers this natural-gas unit for 15 years on the heat exchanger.

Delivery and returns: this water heater ships free by ground delivery and arrives within the window shown above. If it is not the right fit, return it free within 30 days in its original packaging.

• Installation and Clearances

  The unit is wall mounted and intended for indoor or outdoor placement. Plan the installation around the published dimensions and required clearances, then have a qualified professional confirm the site, connections, and local code requirements before the heater is installed.

• Venting Requirements

  Direct venting is required for this heater. The source describes 2-inch venting up to 75 feet and identifies the Versa Vent outdoor adapter as sold separately. Confirm the approved vent layout, termination, clearances, and adapter requirements in the installation manual.

• Natural Gas Supply

  This listing is the natural-gas RX199iN configuration, not a selectable fuel-type listing. The 199,000 BTU input makes gas-line supply sizing an installer decision. A qualified professional should verify the natural-gas pressure, line size, connections, and local code before ordering installation materials.

• Flow and Temperature Rise

  The source lists flow up to 11.1 GPM and a 199,000 BTU maximum input. Delivered flow depends on the required temperature rise, incoming water conditions, fixture demand, and installation. Use the manual's performance tables to size the system for the home's actual hot-water load.

• Controls and Recirculation

  Smart Sense provides the gas control system, while Smart Connect supports Bluetooth setup, service, and troubleshooting through the Rinnai Central App. The source describes recirculation as field convertible with an internal pump kit, so confirm the required kit and controls before planning a recirculation loop.

• Efficiency and Power

  This is a condensing tankless heater with a source-listed efficiency of 0.98 UEF and Energy Star certification. It uses 120-volt power. Confirm electrical service, condensate handling, and the installation requirements for a condensing appliance with the qualified installer.

• Flushing and Maintenance

  Quick Flush is described as simplified flushing, and the source also identifies lime detection. Water chemistry and use conditions still affect service intervals. Follow the manual for flushing, descaling, cleaning, and maintenance, and keep service records for the unit.

• Warranty Terms

  The source lists a limited residential warranty with 15 years on the heat exchanger and 5 years on parts. Its labor coverage appears differently in separate source blocks, including a registration condition, so verify the current written warranty and registration deadline before installation.

• What Ships

  The source page identifies the tankless water heater but does not publish a complete box-contents list. The Versa Vent outdoor adapter is specifically described as sold separately. Confirm included installation parts, venting, pump-kit needs, and other required materials before scheduling the install.

Good to know

• 30.11″ W × 11.4″ D × 18.5″ H; wall mounted.
• Natural-gas RX199iN configuration; verify gas-line sizing.
• Direct vent required; 2-inch venting is source-listed.
• Professional installation is required for gas, venting, electrical, and condensate connections.
• Water heater only. Installation materials and other items shown are not included unless stated.