Noritz Tankless Water Heaters Review

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While the name might not seem familiar to the average person, fans of tankless water heaters immediately take notice when you mention the name Noritz. This company produces a wide range of tankless models, all of which provide some of the best quality and savings you’ll find on the market for both indoor and outdoor models.

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An important distinction is that Noritz focuses on gas (natural gas and/or propane) fueled heaters as opposed to electric due to the lower energy consumption and smaller environmental impact.

About Noritz

The history of Noritz began in 1951 as Noritsu Bath Industry in Kobe, Japan, began to release gas bath boilers and furnaces. This expanded to include oil boilers in 1963, their first tankless heater in 1966, and gas water heaters in 1970.

Noritz tankless water heater

1980 and 1981 saw the birth of the modern Noritz, however, with the introduction of a combination instantaneous heater and the first modern, electronically controlled tankless water heater.

The following decades saw large-scale expansion, a shift to tankless water heaters, and the distinction of being the first tankless company in the world to offer ASME-certified models. Now, nearly 70 years later, Noritz is at the leading edge of tankless water heaters, striving for simple, eco-friendly designs that will also shrink your expenses.

See also:  Noritz Error Code Troubleshooting

Noritz Water Heaters

EZ Series

Noritz EZ111Consisting of three different models, the EZ series offers a mid to high range energy factor and designed specifically to make replacing that old tank model a snap. The EZTR40 has a UEF of .87 and can replace 40-50 gallon tanks using the existing connections, providing your home with up to 6.6 gallons every minute.

As their name suggests, the EZ111 and EZ98 can provide up to 11.1 and 9.8 GPM, respectively. These models are an excellent choice for converting from your old tanks and have an impressive .97 UEF. It’s really tough to go wrong with the EZ series, making it the perfect upgrade choice for most homes. If you have a very large home, you’ll be hard pressed to find a better tankless water heater than the EZ111.

Mid-Range (NR Series)

Boasting a UEF of .81, the NR series offers both indoor and outdoor gas-fed models designed to provide just the right amount of water. Depending upon the model, the temperature settings can be set as low as 100 degrees, while all models have a safety-oriented maximum of 140 degrees. The smallest models provide up to 5 gallons per minute, while most put out 9.8 GPM.

Combination Boilers (NRCB and CB Series)

Noritz CB199 combination boilerCombination (or modcon) boilers provide a two-for-one benefit by acting as both a water heater and small furnace. Of the four current models Noritz offers, the NRCB series provides an amazing 95% AFUE (annual fuel use efficiency) and 9.8 or 11.1  max GPM. The two CB series models provide 9.1 or 9.3 max GPM.

All four models are designed to allow for simultaneous water and space heating, meaning a shower won’t affect the room temperature. Not only are these excellent choices for providing hot water, but the dual purpose means you can also use them to heat your garage or basement at a much lower cost. Best of all, these models have ultra-low emissions that easily surpass standards.

Best Tankless Models

noritz ez111
  • Gallons/Minute: 11.1 GPM
  • Max BTUs: 199,900
  • Energy Factor: 0.96
  • Notes: Replaces 75 gallon tank
EZ98 DV Kit
  • Gallons/Minute: 9.8 GPM
  • Max BTUs: 180,000
  • Energy Factor: 0.96
  • Notes: Replaces 50 gallon tank
EZTR40 Kit
  • Gallons/Minute: 6.6 GPM
  • Max BTUs: 120,000
  • Energy Factor: 0.89
  • Notes: Replaces 75 gallon tank

Noritz Water Heater Parts

Due to the construction of Noritz water heaters, they can outlast much of the competition. However, they will still occasionally need maintenance and parts replaced to keep them in peak condition.

Among the most common parts are water filters, vent components, and gas burners. Please note that some additional components may need to be replaced occasionally for combination models.


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Where to Buy Noritz Tankless Water Heaters

Noritz models can be purchased at Home Depot, Amazon,, as well as other online and local dealers.

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  1. Bought a Noritz EZ111 through Home Depot. It was installed in October 2017 and to date (July 2019) we have had to call the service technicians on 6 occasions. The boiler will light when it decides it wants to. I honestly feel that the Noritz EZ111 is a big piece of crap. I would not recomend it to my worse enemy.

    • I am a contractor, I have installed at least 20 of these units in the past 2 years. not one has given me one issue what so ever. Here is the story on Tankless water heaters, 1 you need to have a lot of education and experience on installing them. The installer needs to make sure the gas line has enough BTU load to handle and extra 150’000 BTU’s . 99% of the time they do not , which means you have to resize your gas line or have the gas company come out and replace the normal gas meter and regulator to a 2 lb. regulator and meter. this will give the gas line the demand it will need to adequately fuel all gas appliances, note with this method all gas appliances will need regulators installed before them in the gas line to take the gas pressure tp 7″ of water column. Also you have to have enough combustion air in he area were the tankless is installed if you are not pulling c combustion air from the outside with the PVC vent. Hard water is also an issue , anything above 4 grains of hardness means the tankless water heater will need to be descaled every year for it to run properly. it will also have to serviced at minimum every 2 years. This is just a small list of things you have to know when installing a tankless water heater. on just about every service call I go out on that another tech installed 90% of the time it wasn’t installed to manufacturers specifications. This is just my 20 years of experience with installing tankless water heaters. Also Noritz is the only brand I will install. Have a nice day !

  2. Bought a property with a Norwitz tankless system. The previous owner had multiple problems and I have inherited the same. Had a plumber come out twice in our first month and it is still not working. I will never buy a home again with a norwitz installed. I would insist on a removal before purchase.

  3. Our Noritz water heater is located in the attic and it works perfectly As long as the attic temperature is 50degrees or warmer. However once the attic temperature drops below 50 degrees,
    We start Error Code 16 unless you pulse the unit. By pulse, I mean that we have to turn the faucet on hot and let it run for 30 seconds and then we turn it off. We repeat this procedure 3 times and after that I am able to take a shower without Error Code 16 showing up. Can anyone shed some light on how to fix this problem?

  4. Had a Noritz unit installed back in 2009,never given me a problem with anything. I clean it out from any dust that accumulates over time and that’s it. This takes about 30 minutes with the panel removed and my air compressor about every two years. Had gas company install the unit which is what I recommend to all if you decided to go with gas instead of an electric unit. If you can install it inside the home utility room or laundry room this would be your best option not outside. Good luck happy savings!!!!

  5. I had a Noritz unit installed in 2004 and have never had a single issue with it. It was descaled about 6 years ago and again about 2 weeks ago. I am however in the process of having it replaced for a newer model but only because I want one with a built-in recirculating pump.


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