199,000 BTU Commercial Tankless Water Heater

The CX199iN is Rinnai's commercial, natural-gas tankless water heater, built for demanding applications with industry-leading thermal efficiency in a compact combustion design meant for easier installation and serviceability. It is listed for indoor location, with indoor-to-outdoor conversion available using the separately sold Versa-Vent outdoor vent cap.

It is rated for a maximum input of 199,000 BTU, a maximum flow of 11.1, and a minimum flow rate of 0.26 gallons per minute, operating between 98°F and 140°F. 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 is wall-mounted and requires professional service, with a 2-inch minimum vent diameter. Rinnai's Smart Sense gas control system and the Rinnai Central app support setup and registration over Bluetooth, and Economy, Comfort, and Commercial Recirculation modes are available. A qualified installer should confirm clearances, gas-line sizing, and local code before installation.

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 unit's heat exchanger for 15 years, parts for 5 years, and labor for 1 year on residential use; commercial coverage is 8 years on the heat exchanger, 5 years on parts, and 1 year on labor.

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

  Wall-mounted installation is required. Before work begins, have a qualified professional confirm the indoor location, or the outdoor conversion path, required clearances, mounting surface, service access, condensate routing, and local code requirements.

• Venting requirements

  Direct venting is required, and the source lists a 2-inch minimum vent diameter. The product information also describes 2-inch venting and an outdoor Versa-Vent adapter, sold separately. Confirm the vent layout, termination, clearances, and approved materials in the installation documentation.

• Natural gas supply

  This listing is the natural-gas configuration. Size the gas line and supply for the 199,000 BTU maximum input, then have a qualified installer verify gas pressure, shutoff, connections, and local code. Propane is a source-described alternative, but it is not the fuel variant offered here.

• Flow and temperature rise

  The source lists a maximum flow rate of 11.1 GPM, with a minimum flow rate of 0.26 gallons per minute. Actual hot-water delivery depends on temperature rise, incoming water conditions, and demand. Published temperature settings range from 98°F minimum to 140°F maximum.

• Controls and recirculation

  The control system supports Bluetooth setup and service through the companion app. Economy, Comfort, and Commercial Recirculation Modes are listed, and the source describes field recirculation with an internal pump option. Confirm pump, control, piping, and electrical needs with the installer.

• Condensing efficiency

  The source describes industry-leading thermal efficiency and a compact condensing combustion design. Actual efficiency depends on temperature rise, hot-water demand, gas supply, venting, condensate handling, and professional installation. Review the current technical documentation for performance details applicable to the site.

• Descaling and maintenance

  Plan regular service for a gas appliance and use the listed flush feature as directed. Descaling, cleaning, condensate checks, and other maintenance depend on water conditions and use. Follow the installation and service documentation, and have a qualified professional complete work that requires opening the cabinet.

• Limited warranty terms

  The source lists a limited warranty. Commercial terms state 8 years or 12,000 hours on the heat exchanger, 5 years on parts, and 1 year on labor. Residential terms state 15 years or 12,000 hours on the heat exchanger, 5 years on parts, and 1 year on labor.

• What ships

  The source identifies the tankless water heater but does not publish a complete box-contents list. The outdoor vent cap is sold separately. Confirm whether venting, gas piping, electrical connections, mounting hardware, condensate parts, pump components, or other installation materials are included before scheduling the work.

Good to know

• 30.11″ H × 18.5″ W × 11.4″ D; 55 lb.
• Natural-gas configuration; 120 V; wall mounted.
• Direct vent required; 2-inch minimum diameter listed.
• Professional installation is required for gas, venting, electrical, and condensate connections. Have a qualified installer confirm the mounting surface, clearances, service access, and local code requirements before work begins.
• Source images show the heater and installation examples. Gas piping, electrical connections, tools, venting materials, accessories, and other installation items shown are not included unless listed.