199,000 BTU Indoor Natural Gas Tankless Water Heater

The RE199iN is Rinnai's non-condensing, natural-gas tankless water heater, built for indoor installation in small to medium homes or remodels that want on-demand hot water without a storage tank.

It is rated for a maximum input of 199,000 BTU, a minimum flow rate of 0.13 gallons per minute, and an energy factor of 0.82. The unit runs on 120-volt power and includes a digital display and automatic overheat protection. Overall dimensions are 27.28 inches high, 14.05 inches wide, and 11.2 inches deep, confirmed against Rinnai's own published spec sheet for this unit, and it weighs 42.1 pounds.

Installation is wall-mounted and requires a qualified professional. The unit is direct vented, with optimized concentric vertical or horizontal PVP/CPVC venting termination configurations available, using one penetration for inner-pipe exhaust and outer-pipe fresh air. It is Mobile Home approved and suited to compact placement, including crawl spaces and attics. 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 for 15 years on the heat exchanger, 5 years on parts, and 1 year on labor for 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

  This indoor heater requires professional, wall-mounted installation. Overall dimensions are 27.28 inches high by 14.05 inches wide by 11.2 inches deep, confirmed against Rinnai's published spec sheet. Verify service clearances, connections, and local code requirements against the installation manual.

• Venting Requirements

  Direct venting is required for this heater. The source describes optimized concentric vertical or horizontal PVP/CPVC termination configurations, with inner-pipe exhaust and outer-pipe fresh outdoor air through one penetration. Confirm the approved vent layout, termination clearances, materials, and any length limits in the installation documentation.

• Natural Gas Supply

  This listing is the natural-gas configuration with a maximum input of 199,000 BTU. Gas-line sizing, supply pressure, fittings, and connection details should be verified by a qualified installer for the home and local code. Do not substitute liquid propane without confirming a separately approved configuration and conversion requirements.

• Flow and Temperature Rise

  The source lists a minimum flow rate of 0.13 gallons per minute and a 199,000 BTU maximum input. It does not provide a maximum flow or temperature-rise table for this listing. Delivered hot-water performance depends on incoming water temperature, setpoint, fixture demand, and the installed gas and vent system.

• Controls and Recirculation

  The unit includes a digital display and front control panel, with automatic overheat protection listed as a built-in feature. The source does not identify a recirculation pump or recirculation package for this listing. Confirm any external controls, pump, or recirculation design with the installer before planning the plumbing layout.

• Efficiency and Power

  The source lists a 0.82 energy factor for this natural-gas heater and identifies a 120-volt connection in the source title. It is described as non-condensing. Confirm electrical service, gas supply, venting, and the applicable installation requirements with a qualified professional before connecting the unit.

• Flushing and Maintenance

  Plan routine flushing, descaling, cleaning, and service according to the installation manual and local water conditions. The source page does not set a maintenance interval, so ask the installer to establish a schedule for the home's water quality, usage, and operating conditions, and keep the service record with the unit.

• Warranty Terms

  The source lists a limited warranty with 15 years on the residential heat exchanger, 5 years on residential parts, and 1 year on residential labor. Commercial terms are listed as 8 years on the heat exchanger, 5 years on parts, and 1 year on labor. Verify written coverage and registration requirements.

• What Ships

  The source page identifies the tankless water heater but does not provide a complete box-contents list. Installation materials are not stated as included, so confirm what ships with the heater, along with venting, gas fittings, valves, electrical items, and other materials, before scheduling professional installation.

Good to know

• Structured size: 14.05″ W × 11.2″ D × 27.28″ H, confirmed against Rinnai's published RE199iN spec sheet.
• Plan wall mounting, direct venting, natural gas, and service access before installation.
• The source does not provide complete box contents or a maintenance interval.
• Professional installation is required for wall mounting, the natural-gas connection, direct venting, electrical supply, and service clearances.
• Heater and installation-reference images are shown for this product. Gas piping, electrical connections, tools, and additional installation materials are not included unless listed.