Noritz 9.8 GPM 199,900 BTU Residential Propane Direct Vent Concentric Tankless Water Heater (.82 UEF)

The Noritz NR98-DVC-LP 9.8 GPM 199,900 BTU Residential Propane Direct Vent Concentric Tankless Water Heater delivers powerful, on-demand hot water for larger homes while helping reduce energy consumption by heating water only when a hot water fixture is in use. Unlike traditional storage tank water heaters that continuously maintain a limited supply of heated water, the NR98-DVC-LP provides an endless supply of hot water without standby energy loss, making it an excellent choice for households with multiple bathrooms and high simultaneous hot water demand.

Designed for indoor installation, the NR98-DVC-LP features a direct vent concentric system that uses a single vent assembly to bring in combustion air and safely exhaust flue gases. Delivering up to 199,900 BTU of propane heating power and a maximum flow rate of 9.8 gallons per minute, this compact wall-mounted tankless water heater combines commercial-grade durability, advanced safety features, precise temperature control, and flexible installation options for years of dependable residential performance.

Product Features:

• 199,900 BTU Maximum Input: Provides powerful propane heating capacity for larger residential homes with higher hot water demands.
• Up to 9.8 GPM Flow Rate: Delivers continuous hot water for multiple showers, sinks, dishwashers, washing machines, and other fixtures simultaneously, depending on incoming water temperature and required temperature rise.
• Direct Vent Concentric Installation: Designed for indoor installation using an approved 5-inch/3-inch Noritz stainless steel concentric vent system that combines combustion air intake and exhaust into a single vent assembly.
• Non-Condensing Design: Delivers dependable performance with a Uniform Energy Factor (UEF) of 0.82 while heating water only when hot water is required.
• Commercial-Grade Copper Heat Exchanger: Manufactured with commercial-grade copper tubing that is approximately 25% thicker than standard residential heat exchangers for enhanced durability, efficient heat transfer, and long service life.
• Fully Modulating Burner: Automatically adjusts from approximately 16,000 to 199,900 BTU to maintain consistent outlet water temperatures while maximizing fuel efficiency.
• Adjustable Temperature Settings: Includes a remote thermostat with adjustable temperature settings from 100°F to 140°F in 5°F increments, allowing precise control for residential hot water applications.
• Quick Connect Compatible: Two identical NR98 Series units can be connected using the optional Noritz Quick Connect Cord to nearly double available hot water capacity without requiring an additional controller.
• Scale Detection Function: Built-in maintenance reminder alerts homeowners when flushing and descaling are recommended to help maintain peak efficiency and extend equipment life.
• Freeze Protection: Built-in freeze protection helps safeguard the heat exchanger during freezing temperatures when installed according to manufacturer instructions and connected to electrical power.
• Advanced Safety Features: Includes flame sensing, overheat prevention, lightning protection, fan rotation monitoring, temperature lockout, high elevation adjustment, thermal fuse protection, and advanced self-diagnostic monitoring.
• Compact Wall-Mounted Design: Saves valuable floor space while providing easy access for installation and maintenance.

What Is an Isolation Valve Kit?

An isolation valve kit is a recommended accessory for every tankless water heater installation. Isolation valves connect to the hot and cold water lines and allow the water heater to be isolated for flushing, descaling, maintenance, or servicing without shutting off water to the rest of the home.

Regular maintenance is important because minerals naturally build up inside the heat exchanger over time, particularly in hard water areas. Installing isolation valves makes annual flushing significantly easier while helping preserve efficiency, maintain reliable performance, and extend the life of the water heater.

Short vs. Long Isolation Valve Kit

For the Noritz NR98-DVC-LP, only one isolation valve kit is required depending on the available installation space.

• IK-WV-200-5-TH-S Short Isolation Valve Kit: Ideal for installations where available space is limited or a compact plumbing arrangement is preferred.
• IK-WV-200-5-TH-L Long Isolation Valve Kit: Recommended when additional clearance is available, allowing easier access for future maintenance and servicing.

Both isolation valve kits include durable 3/4-inch threaded hot and cold isolation valves together with a lead-free pressure relief valve. The correct kit depends on the installation layout and available working space.

Understanding Tankless Water Heater Sizing

Unlike traditional storage tank water heaters, tankless water heaters are sized using flow rate (GPM) and temperature rise rather than tank capacity. Flow rate represents the amount of hot water the unit can produce each minute, while temperature rise is the difference between the incoming groundwater temperature and your desired outlet temperature.

Always size a tankless water heater using your area's winter groundwater temperature, since colder incoming water requires more heating capacity and reduces the maximum available flow rate.

For example, if your desired hot water temperature is 120°F and the incoming groundwater temperature is 50°F, the required temperature rise is:

120°F − 50°F = 70°F Temperature Rise

Use the Noritz flow rate chart included with the product literature to determine the expected hot water output at your required temperature rise. This helps ensure the water heater is properly sized for your household's simultaneous hot water demand.

Warranty

The NR98-DVC-LP includes Noritz's residential limited warranty featuring a 12-year heat exchanger warranty for standard residential installations, a 5-year parts warranty, and a 1-year reasonable labor warranty. When installed with a controlled recirculation system using a minimum aquastat pump control, the heat exchanger warranty remains 12 years or 6,500 operational hours, whichever occurs first. Always verify propane fuel supply, approved concentric venting requirements, electrical requirements, water quality, local plumbing and mechanical codes, and all required accessories before installation.