Noritz NRC Series of Tankless Water Heaters Review

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A review of Noritz NRC series of tankless and condensing water heaters including the top features, specs and benefits. The NRC series is coming from the ecoTOUGH group which is great for both small and large houses with up to 4-bath homes and homes with the high hot water demand.

As the Noritz NRC models are designed as condensing tankless water heaters, they are able to use the residual heat from the flue gases and preheat the cold incoming water, increasing the energy efficiency to high 95%. Noritz NRC water heaters are designed to operate not only with the great performance and efficiency, but provide lower greenhouse gases, savings on utility bills and government grants as the Energy Star recognized units. Except the residential use, water heaters can also be used in commercial applications; offices, mechanic shops, small restaurants, schools...


Noritz NRC models overview


Noritz NRC111Noritz water heaters from NRC111 series are designed for the outdoor installation (model NRC111-OD) and indoor installation as the direct vent (model NRC111-DV).

In both cases water heaters use either natural gas or propane (LP) gas for residential water heating. These models, with the high water flow of up to 11.1 GPM, can easily meet high hot water demand of large homes with up to 4 baths, and also multiple applications. And with the Quick-Connect feature, two models can be connected into one system to double the capacity. The remote controller comes with the units.


NRC98 line of tankless water heaters is the second largest group, designed with the maximum gas input of 180,000 Btuh and hot water flow rate of 9.8 GPM, making it perfect for homes with up to 3 baths. The energy efficiency is close to the above models, 93%, ensuring significant energy savings. There are both indoor (DV) and outdoor (OD) models available, and this group was the first one that was offering a high efficient outdoor model. The NRC98 is also capable using the Quick-Connect feature for high demanding homes.


Noritz NRC711 group comes with the maximum power of 157,000 Btuh and flow rate of 7.1 GPM which is recommended for homes with up to 3 showers. Weighing only 41 pound, the units are much lighter than the NRC111 models, making it easy to handle during the wall-mount installation. Even being small, both indoor and outdoor units are capable providing a high energy factor of 0.94. It comes with the scale detection software for reducing the effects of scale build-up and display window for convenience - to view the status and error codes.


Noritz NRC663-FSV is also known as the model EZTR40. This is a small and lightweight condensing unit that comes with the maximum gas input of 120,000 Btuh and water flow of 6.6 GMP, making it great for efficient whole house water heating in smaller homes.

The EZTR40 model is used for indoor installations only and it uses the N-Flex kit for the installation inside of B-vent - no need to change an existing vent. Its ability to use the existing B-vent, top mount water connections and half inch gas connection allows the homeowners easy replacement of an existing 40-gal and 50-gal tank-type water heaters.


The NRC661 is the smaller version of the above NRC771 model, it is lighter, has less power - 120,000 Btuh and lower water flow of 6.6 GPM, supplying homes with up two baths without difficulties.

An overview of the top features

Dual heat exchangers

Some models, such as the Noritz NRC111, are equipped with two heat exchangers, primary made of the thick, commercial-grade copper and secondary made of durable stainless steel, both resistant to the high thermal and mechanical stress, including the corrosion.

Flexible vent installation

As the NRC series utilizes the condensing technology which results in the lower exhaust temperatures, the manufacturer recommends, instead of the stainless steel venting, cheaper PVC and CPVC vents.

Fully modulating gas burner

Best models such as those from the NRC111 series utilize dual flame burners for the maximum heating output and less temperature fluctuation. The modulating gas valve automatically adjusts the gas burner output so the power can go from its minimum of 16,000 Btu/hr to its maximum of 199,900 Btu/hr. Such a power adjustment provides cleaner gas combustion, savings and longer operation.

Connecting Noritz models

Quick Connect cable allows some NRC units to provide twice the hot water capacity of one unit. For even more power and water flow, multi-system can be used, as up to 24 units can be linked and operated by a single controller.

Worry-free ignition

As other Noritz tankless water heaters, NRC models are not using the pilot light, but direct electronic ignition that automatically lights the burner.


Noritz condensing water heaters are versatile as they are not used for heating the potable water only, but for space heating too, due to its combi-system design.

Remote control

The remote control, which is included in the shipment, is very simple and functional. It includes the setting buttons and digital display so the homeowner can easily see the operating status, temperature, and the error code when the problem occurs.

Self diagnostic system for easy troubleshooting

The self-diagnostic system helps in troubleshooting as it shows the error code, such as 11, 29, 90, 92, 99 on the remote control display.

Safety devices

  • Flame sensor
  • The thermal fuse for the overheat prevention
  • Freeze protection to - 30 F for an indoor and -4 F for outdoor models
  • Lighting protection device
  • Neutralizer overfill
  • Fan rotation detector


Noritz NRC series, as it can be see from above short review are ultra-efficient models that are used in a variety of applications.

The Noritz NRC111 model is the most advanced and powerful tankless water heater from this group that has an ultra high efficiency for the Energy Star approval, comes with the greatest flow rate and it also saves the energy, produces less NOx gases and has a lower impact on the environment.

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Pictures - courtesy of Noritz company

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