Noritz Water Heaters
Reviews & Buying Tips

Noritz tankless water heaterNoritz tankless water heater

Check out our Noritz water heaters review and buying tips, including the best condensing, conventional, and Energy Star tankless models for efficient potable water and space heating, in residential and light commercial applications.

Check out the top Noritz tankless water heaters from the EZ, CB, NRCP, NRC, NR, NC, and NCC series and boilers, utilizing natural and liquid propane gas fuel. Compare the models, specs, and features and find the reviews of the best-selling models, including the error code guide for simple troubleshooting.

Noritz water heaters - Buying tips

Noritz NRCP1112Noritz tankless water heater

A manufacturer of Noritz water heaters carries a variety of gas-operated on-demand water heaters that are environment-friendly, utilizing advanced and green technology for significant energy and space conservation.

Using the finest and superior technology, Noritz on-demand water heaters are producing hot water with ultra-high thermal efficiency making them Energy Star rated, with more savings available to you, when comparing to standard or conventional units.

 Advantages and benefits

Easy installation

Noritz water heaters, with their compact and small design, can be installed virtually anywhere (there are restrictions also), saving you lots of space with the wall mounting installation. In addition, as they are Eco-friendly, they emit fewer greenhouse gases like CO2 and NOx, making them great even for regions with strict emission regulations.

Models are combustion-sealed and have great advantages over atmospheric units as they don't use internal air for combustion.

For the indoor models (DV), Noritz provides all the necessary vents and accessories. Outdoor models (OD) are vent-less.


Another great benefit of Noritz water heaters is their longevity, so less waste goes into the landfills than tank-type; units are also smaller, more durable, and with a high percentage of recyclable materials. Since every part is replaceable, there is no need to replace the whole unit when there is a malfunction; replacing the damaged part is enough.

Green technology

Advanced Noritz water heaters come with a superior and greener condensing technology because it takes advantage of the available latent heat to provide excellent thermal efficiency of over 90%.

Safe operation

Like other tankless manufacturers, Noritz models produce endless and almost instant hot water, especially with the NRCP models with built-in recirculation. However, thanks to the electronic system and many built-in sensors, Noritz water heaters are safe and reliable, protecting users from scalding water.

Plenty of hot water

Noritz water heaters are designed with the capacity and power output enough for one to five bathroom houses, where the NRCP1112 model, for example, has a water flow rate of high 11.1 GPM. If you need even more power and hot water, there is an option to link up to 24 units using the linking system, and therefore satisfy high-demand applications.

Size variety

Noritz water heaters are designed for whole-house applications, and the smallest model produces 5.3 GPM, which is enough for homes with one to two bathrooms. The largest model with a water flow of 11.1 GPM is ideal for up to 4-5 plumbing units.

Every Noritz water heater uses minimal electricity, mainly to light the gas burner with the direct electric ignition, to power the vent and PC board, which controls the system.

Simple troubleshooting

With the built-in PC board and smart technology, the heater displays several error codes, which signalizes if there is a problem with the unit. Using details of that code, DIY handypersons and plumbers can easily fix the problem.

For example, the most common problem with any water heater is the sediment buildup inside the copper piping and heat exchanger. Noritz recommends three solutions:

You can also buy a tankless water heater flushing kit to make a job faster and easier. The kit comes with the utility pump, hose and bucket, and you also have to get vinegar or any other cleanser.

And if you have isolation valves installed even better for you.


Noritz tankless models utilize a TurboFlow system that allows heaters to meet any hot water demand, especially in the summer when the incoming water is warmer and when the heater automatically boosts its output to provide more flow capacity.

Dual-flame burner

Some Noritz gas appliances are the only products of all manufacturers that are using a Dual-Flame Burner. This dual principle element utilizes the latest combustion technology that is electronically controlled and therefore provides hot water with very low-temperature fluctuation, maximizing the heat output and maintaining high efficiency.

Dual-flame burner technology uses two rows of burners, where the second one burns the unlit gases escaped from the first row burners, so the result is an increased output efficiency, stabilized hot water temperature (reduced fluctuations), and improved performance; (not available on some models).

Commercial-grade heat exchanger

Above the gas burner, water is heated in a commercial grade heat exchanger that is built from thick commercial grade copper piping, making it more resistant to stress and durable.

Condensing models have an additional secondary heat exchanger made of corrosion-resistant stainless steel material.

Electronic board

With the resin-coated PC board and an onboard memory chip that stores the information about error code history, maintenance and troubleshooting become very easy.

Condensing technology

Noritz condensing water heaters are performing so well because of the advanced design. Condensing units feature a dual heat exchanger that combines stainless steel and copper heat exchangers.

The stainless steel component is designed to use the residual heat from the exhaust gases to preheat the incoming water before it runs through the main, primary copper heat exchanger.

The result is a significant reduction of carbon dioxide and an increase of the heater's efficiency to over 90%.


Noritz heaters are designed as indoor models (DV) utilizing single-concentric and dual venting, or outdoor (OD), which are ventless.

Model selection

As mentioned in the above text, Noritz tankless water heaters are designed to provide an endless supply of hot water, from point-of-use to whole-house applications - up to 5-bath homes.

The heaters are grouped into several categories:

  • NRCB series – combination boilers
  • EZ series – allows direct tank replacement and easy installation with the top mount water connections and flexible vent that utilizes existing B-vent.
  • CB series - combi boilers with condensing technology that delivers hot water to plumbing and hydronic heating applications.
  • NCC series
  • NRCP series – condensing water heaters with the recirculation
  • NRC series - condensing models
  • NR series - non-condensing models
  • NC series

Best advanced models to buy

The best and most advanced Nortiz water heaters to buy for residential homes come from the High-Efficiency series - NRCP and NRC, a series of ultra-high efficient models that benefit the homeowners - significant savings ultra-low carbon footprint.

The best model to buy is the Noritz NRCP112, a direct vent and tankless gas water heater, that is, thanks to the high water flow delivery of 11.1 GPM, used in large homes with up to 4.5 baths. It is available in natural and propane gas options and can generate up to 199,900 BTU of power with an ultra-high-energy factor of 0.92.

What makes it different and unique is condensing technology that uses the heavy-duty stainless steel heat exchanger and internal circulation pump, allowing internal and external recirculation. As a result, users are getting hot water faster, saving time, water and energy.

A similar model as the above NRCP112 is NRC111, with the same capacity and power but with no internal circulation pump, recirculation modes, and built-in remote control, making it much lighter and cheaper.

While the NRCP112 is available only as the indoor DV model, Noritz NRC111 comes with indoor and outdoor versions.

Top affordable models to buy

The top affordable tankless water heaters to buy come from the conventional, non-condensing group, such as the Noritz NR series, a series with only one heat exchanger.

The NR98 model is the largest unit in this Mid Efficiency group and is able to produce up to 9.8 GPM of hot water, which is sufficient for homes with up to 3-4 baths. Even more hot water can be delivered if two units are connected using the Quick Connect Multi System.

As opposed to condensing models and their superior efficiency, the NR98 model can provide only 0.83 energy factor and a maximum temperature of 140 F, which does not qualify them as the Energy Star products.

Noritz NR98 comes with the three venting options; direct vent concentric - DVC, single vent - SV, and outdoor - ventless. However, as opposed to the condensing models, cheaper PVC venting cannot be used on the indoor model NR98-DVC, as the exhaust temperature is higher.

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About Noritz

Noritz is one of the most popular and biggest Japanese manufacturers of water heaters producing appliances for heating since 1951, for residential and commercial use.

With a capacity of 1.3 million water heaters per year, Noritz has the largest production of on-demand gas appliances. In addition, the company claims to have the largest manufacturing plant of tankless water heaters in the world.

Noritz America Corporation was established in 2001, and it offers a variety of tankless water heaters for residential and commercial applications.

Noritz America headquarters is located in California with several branches throughout America; Atlanta, Chicago, Dallas, New York, and many certified dealers and trained installers.

Noritz website: noritz.com

More about Noritz tankless water heaters

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