Noritz Tankless Water Heater Reviews

Noritz, having been a renowned manufacturer and distributor of water heating systems for over 60 years within the U.S and Canada, offers a wide range of qualitative and efficient water heating systems to satisfy a vast category of customers. And so, it provides among its innovative and efficient qualitative products tankless water heaters.

Having maintained a focus on your satisfaction as the client, Noritz offers its tankless water heaters to a happy group of domestic and commercial clients. Their clients get to enjoy merits such as; durable, qualitative, easy to install tankless water heaters with versatile installation options just to name a few.

In this review article, you will come across some of the best tankless water heaters by Noritz just to assure the validity of the Noritz tankless water heater’s said efficiency. As you read on you will get to know what makes the Noritz tankless water heaters top of the line even as you learn more about tankless water heaters.


Top Rated Noritz Tankless Water Heater


Noritz Tankless Water Heater Reviews

The following is a detailed review of the top tankless water heaters by Noritz. With their features and advantages described alongside their pros and cons, maybe you will find your pick here.


1. Noritz NR981-SV-NG

Noritz NR98SVNG Indoor Only Tankless Hot Water Heater, Single Wall Vent, max. 199,900 Btuh, 9.8 Gpm - Natural Gas

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The Noritz NR981-SV-NG tankless water heater is an elegantly designed yet efficient water heater created to function not only indoors but also in the outdoors. This indoor/outdoor tankless water heater is known for its power making it utile for small to mid-sized homes supplying heat to up to four showers with ease.

It has been created to perform so efficiently that it spots convenient features such as safety lock-out, freeze protection, and high elevation adjustment making it safe and easy to use in a domestic set-up especially.

The Noritz NR981-SV-NG is a natural gas tankless water heater with a sturdy, durable structure that allows it to comfortably sustain the different environments (indoors and outdoors) that it can be installed at.

Speaking of installation, the Noritz NR981-SV-NG spots a quick connect system that allows you to conveniently combine two identical heaters and get double the energy output.

This natural gas tankless water heater also features a remarkable gas consumption of 12,000 to 199,900 BTU per hour which gives it an 84% thermal efficiency rating. And with such a high thermal score, the Noritz NR981-SV-NG water heater is equipped with four different default temperature settings. That includes; 120, 130, 140 and a 180 degrees Fahrenheit manufacturer default setting.

Being a natural gas tankless water heater, the Noritz NR981-SV-NG needs to be power vented due to hot exhaust. This water heating system is covered by a zincified steel plate, finished with a polyester coating, not forgetting the stainless-steel collar and the copper sheeting and copper tubing on the heat exchanger.

These structural designs come as countermeasures against the hot exhaust issue thus lowering the venting cost. This tankless water heater is also made with a direct ignition making it quite convenient as a quicker way to turn the heater on. On top of all that the Noritz NR981-SV-NG tankless water heater also comes with a 12-year warranty.


  • High flow rate
  • Low Nox design
  • 100-140 degrees Fahrenheit temperature range
  • Turbo flow
  • Commercial grade heat exchanger
  • Thermal Fuse
  • Direct ignition
  • Resin coated PC board
  • Automatic air regulator


  • Indoor and outdoor water heating
  • Safety lock-out and freeze protection for safer operation
  • 12-year warranty


  • Limited to Urban users given that natural gas is inaccessible in rural areas


2. Noritz EZTR40-NG

Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) - Natural Gas

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As far as tankless water heaters go the Noritz EZTR40-NG is the first of its kind, and its specs will show you why. First, it comes packaged as a complete kit including a flexible polypropylene vent pipe that has been designed as part of its condensing technology as a venting conduit. Also, within its equipment is an isolation valve kit that enables you to service and descale the Noritz EZTR40-NG tankless water heater much more conveniently when you need to.

In addition, on convenience, the Noritz EZTR40-NG tankless water heater is installable on gas lines as small ½” making it the installation process on existing gas lines more affordable as well as less time-consuming.

The Noritz EZTR40-NG goes on to prove its efficiency as it can replace with ease a 30 to 40-gallon tank water heater. This indoor tankless water heater also boasts of gas consumption of 120,000 BTUs per hour that heats up to 6.6 gallons per minute putting as an Energy Star Listed product.


  • High efficiency condensing
  • A heating capacity range of 0.5 to 6.6 GPM
  • Comes with a flexible vent kit
  • Directly replaces 30/40-gallon natural gas water tank heaters
  • Endless hot water


  • Comes with a completely packaged kit that includes a polypropylene vent pie, and an isolation valve kit
  • Energy star listed
  • Installable in gas lines as small as ½”


  • Quite expensive


3. Noritz NRC661-DV-NG

Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM - Natural Gas

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The Noritz NRC661-DV-NG is a tankless water heater designed to efficiently serve small homes which conveniently allows you to choose between natural gas and propane gas as your fuel source. It, however, uses electricity for ignition which works well in preventing the internal mechanisms from freezing over.

As a top tankless water heater, the Noritz NRC661-DV-NG has a 0.91 energy factor, a gas consumption ranging from 15,000 to 120,000 BTUs which delivers a hot water flow of 0.5 GPM to 6.6 gallons. That has given the Noritz NRC661-DV-NG tankless water heater an EF of 93%.

However, with its kind of flow rates, this tankless water heater has a limited functioning area. It can serve a maximum of two showerheads or faucets simultaneously on a typical day. And when it gets colder, say winter season, the Noritz NRC661-DV-NG tankless water heater can only supply a low-flow showerhead or faucet with hot water. That makes it utile for small families and small homes or point of use usage.

This indoor tankless water heater comes with a direct vent kit made of PVC or CPVC material pipes.

When switched on this tankless water heater takes in 54 watts of electricity on an average day whereas on a day made cold by the winter the consumption rises to 138 watts as it runs on anti-frost mode.

This heater is also equipped with a battery back-up that can be utile during power outages which is pretty much very convenient.

Speaking of convenience, the Noritz NRC661-DV-NG tankless water heater is designed with a basic temperature control system that comes with an optional remote control for a digital display.

The remote enables you to choose from nine different temperature settings giving you more control over the heating system. Unfortunately, the remote does not come as part of the package.

The Noritz NRC661-DV-NG tankless water heater also spots two heat exchangers made of commercial grade copper which is way more efficient having been 25% thicker than usual copper. And on top of that this tankless water heater has been equipped with a flame sensor, freeze protection, fan rotation detector, overheating and lightning protection devices, a temperature control lock, and a condensate overfill detector all to ensure the safety factor has been accounted for.

To top all that of Noritz as manufacture confident with the quality and durability of this product ad to it a 12-year warranty.


  • Continuous hot water supply
  • Legible for venting with scheduled 40 PVC pipe and fitting
  • Low Nox design
  • A heating capacity range of 0.5-6.6 GPM
  • Home size: can be used for two baths in the Southern climate and 1.5 baths in the Northern climate


  • 12-year warranty
  • A digital temperature control system


  • Utility remote sold s separately
  • Cannot adequately perform in big homes or frigid regions



In the unlikely event that the upper part of this article has not been helpful enough in addressing any queries you may have about Noritz tankless water heaters to be more specific, here are some of Noritz’s most frequently asked questions to help you out;

How many Noritz tankless heaters do I need for my home?

Noritz manufactures different tankless water heaters with variance in size and thus heat capacity ranging from 6.6 gallons per minute to 13.2 gallons per minute. Basically, you need just one Noritz tankless water heater so long as it’s the right size depending on the size of your home and thus the gallons of heated water you would need per minute.

Can I install a Noritz tankless water heater in a mobile home?

Yes, you can if you get yourself the Noritz Direct Vent and outdoor tankless water heater models.

How much can I expect to save on my monthly bill?

Given the tankless water heater technology that applies the use of gas to heat water on demand you get to save up to half the initial energy and hence cost of heating water within your premises.

Can I use my existing venting for Noritz tankless water heater?

No, you cannot, because tankless water heaters are required to be Category III stainless steel venting to prevent corrosion from the slightly acidic condensate that forms during combustion.

Do I need to upgrade my gas line?

Yes, you do since tankless water heaters need relatively larger gas lines given their higher BTUs. The gas line upgrade will be determined by the tankless water heater model that you choose.

Why do I need electric power?

Even though the Noritz tankless water heaters strictly use natural or propane gas they are designed with digital remote applications, and PC boards that need the electrical power as a fundamental aspect of their functioning. Their electrical consumption is however very minimal.

How long do Norizt tankless water heaters last?

Noritz tankless water heaters are quite durable having been tested and proven through very rigorous quality control tests. Also, all tankless water heater parts for Noritz products are replaceable.

Will I get instant hot water with a tankless water heater?

No, you will not. Unlike what most people mistakenly think a tankless water heater will take around the same time as a tank water heater to heat the water through your plumbing system. However, this can be alleviated by hooking up your tankless water system with recirculation pumps.

Which recirculation pumps does Noritz recommend?

Noritz recommends the following recirculation pumps that keep full warranties;

  • ACT/Metlund® Hot Water D’MAND® S-70T
  • ACT/Metlund® Hot Water D’MAND® S-02T
  • Taco D’MAND pumps 008-DM-P
  • Taco D’MAND pumps 0011-DM

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