Best Navien Tankless Water Heaters Review

Top 5 Navien Models on the Market

1. Navien NPE-240-A


Works as-is or with the addition of a separate cover

Comes with both a pump and a buffer tank

Digital screen is easy to see


Is too large for installation in some homes

Will cost more to run than smaller models do

Our top choice is easily the NPE-240-A, which gets the highest reviews from customers because it comes with so many great features.

Among those features is a pump that recirculates the supply inside to keep it at a higher temperature and a buffer tank. These elements work together to provide your home and family with an on-demand supply of hot water.

Designed to work with PVC venting of up to 60-feet long, this model is easy to install but does require professional installation to maintain your warranty, which covers most parts for between five and 15 years.

This tankless heater also works with natural gas lines of 0.5 inches that you already have in your home.

A digital screen near the bottom helps you see the temperature you selected as well as all other settings. Conveniently placed buttons nearby help you move between settings, change the temperature and even set a timer to tell it when you will need hot water.

2. Navien PE-240S-NG


Uses intelligent technology to preheat the H2o before you need it

Convertible design works in most homes with natural gas

Includes an installation kit


Installation kit may not feature all the parts that you need

May shut itself off because it thinks you don’t need water

For homes with existing natural gas lines, this is one of the top options because it works with gas lines of standard sizes.

One of its top features is that it uses intelligent technology to quickly preheat water before you need it, which helps the H2o reach the maximum temperature that you set even faster. A built-in buffer tank and recirculating technology allows it to keep moving and helps regulate its temperature.

As a convertible design, the 240S-NG will work in most homes that use natural gas and will let you convert the tankless heater based on your needs. It also comes with an installation kit that makes installation more manageable, but this package may not come with all the parts that you need.

This tankless heater has two heat exchangers inside that regulate the supply and use stainless steel that lasts for years, and you’ll get the same digital display and buttons as found on our top choice.

3. Navien NPE-240A


Energy Star rated to help you save on power usage

Low emissions tankless heater meets the standards for usage in all states

Has a maximum flow rate of more than 11 gallons per minute


Fittings can develop leaks over time

Warranty does not cover labor costs

If you love water that comes out at a higher temperature for bathing, you’ll like this 240A model because it has a high-temperature range.

Though the product comes set at a temperature of 120 degrees Fahrenheit, you can adjust the heat up to a maximum of 160 degrees Fahrenheit, but most users will find that 120 to 140 is the perfect setting.

Adjusting the temperature is easy because of the digital screen and buttons found near the base of the appliance.

The rating from Energy Star found on this tankless heater lets you know that it will work efficiently and without wasting or using a lot of power, which helps keep your energy bills low.

Designed for installation on a wall in your home, this one needs just 120 volts to run. It has a maximum flow rate of more than 11 gallons to provide you with the perfect amount of hot water at a faster pace.

4. Navien PE-240S-NG


Flow detector monitors the amount of supply that comes out to cut down on waste

Intelligent technology preheats before you turn on the tap

Works with a standard 0.5-inch gas line


Warranty covers only one repair per part

Clogs in the front will keep the entire heater from working

Those looking for a tankless heater that performs well but will still fit their budgets will appreciate this model, which costs less but comes with some great features like connections that work with a standard 0.5-inch gas line.

It also uses the same intelligent technology found on more expensive products that will preheat your water before you need it. This feature allows you to turn on the tap and feel hot water coming out in seconds.

As a condensing model, this one is much more efficient than those from other manufacturers and comes with a high Energy Star rating too.

A digital screen shows you the temperature setting and other information, and buttons nearby let you turn on the timer, adjust the temperature and make other changes.

It also comes with a flow detector that monitors and adjusts the supply coming out to reach the maximum flow rate that you need.

5. Navien NPE-180A


Intelligent technology preheats water to keep it at a higher temperature

Compact design takes up less space when mounted on a wall

Digital screen shows the temperature and other settings in a bright color


Only works with a 15,000 BTU output

Requires the purchase of a separate vent for outdoor installation

Other models are so large that they might not fit in your smaller home, but the NPE-180A from Navien is small enough to fit in any space, and it mounts right on the wall to save you even more space.

It comes with features you’ll like, including a digital screen and an intelligent preheating system. This system keeps the temperature at a higher degree, which reduces the time it takes for the supply to reach your maximum setting later.

With the digital screen, you’ll have no problems keeping an eye on all your settings because this display uses bright numbers that you can see, even when there is no light available in the room.

This screen works with the buttons on the bottom to effortlessly switch between settings, adjust the timer when you’re on vacation and increase the temperature and flow rate. Its one minor flaw is that it requires a 15,000 BTU output to use.


Navien NPE-240-A

Just deciding on a product from Navien tankless water heater isn’t the only thing you need to do because you should also look at ratings and see what other shoppers thought, and the product from this company with the highest reviews is the NPE-240-A, which comes with a pump designed to recirculate the supply inside.

This feature keeps a constant flow of hot water ready for you and lets you spend less time waiting for it to come up to temperature. It will work with two-inch PVC venting and existing gas lines too.

One feature we like about this model is that it comes with a digital screen that shows you the current temperature of the water and the temperature that you selected. Buttons beneath the screen let you change the temperature and access other settings.

Though it does not come with any hood or cover, you can buy a sheet directly from the manufacturer for yours.

A Buyer’s Guide

Tankless water heaters are an excellent option for homes today because these models let you wash dishes, take showers and use hot water for other needs without standing around and waiting.

Instead of using a tank, many have coils or a similar design that allows the supply to quickly move across a heat source and come up to temperature fast, and you can usually select the temperature that you want to use. This prevents any scalding or boiling coming out of the tap.

One of the top names in this industry is Navien, which makes both propane tankless heater and designs that work with natural gas lines. You need to make sure that the tankless heater you pick will work with the lines that are already in your home.

Our favorite tankless heater is the Navien NPE-240-A, which comes with a warranty that covers some parts for five years and others for up to 15 years.

It has a built-in pump that keeps the supply circulating inside the heater and continuously moving across the coils to provide you with instant hot H2o almost as soon as you turn on the tap. This tankless heater works with two-inch PVC piping and has digital controls on the front for more natural changing of controls and settings.

How to Choose The Right One

What is the Temperature Range?

One important factor to consider is the temperature range that comes with each tankless heater as well as whether it comes set to one specific temperature.

Navien tankless heaters usually come set at a 120 degree Fahrenheit rating, which may be slightly too cool for your needs. While a range of up to 160 degrees Fahrenheit is high enough for most homes, many users will never set the temperature this high. Using a set of around 140 to 145 degrees Fahrenheit will prevent burns and other injuries.

What is the Flow Rating?

Flow rating is a term that manufacturers use to describe the amount of H2o that flows out per minute. Most use a gallon measurement. Many tankless heaters come with both a maximum and a minimum flow rating.

While this may not seem that important to you, it’s essential when you plan on using two supply sources at the same time or one after another. You might need to take a shower and then wash a load of dishes, or you might have two family members who want to make a shower in the morning. A higher flow rate of 10 to 11 gallons per minute will keep your home and family with the necessary amount of H2o.

How Much Power Does it Need?

Check with the manufacturer or read the product description to find out how much power it needs. The volts required will tell you whether your outlets can accommodate the appliance, but it also lets you know whether you need to upgrade your circuit breaker. Upgrading a circuit breaker or a fuse box will add significantly to your installation costs.

Is There an Included Warranty?

Installing a new model can easily cost between $500 and $1,000 or even more, but these products will provide your home with hot water for 10 to 15 years or longer. You should always check the warranty to ensure that it covers all parts and to see how long it will last. Navien offers a warranty that lasts for five years in most parts and 15 years on some of the more expensive parts.

Looking at the warranty will also reveal how much coverage you get. You may find that your warranty only covers parts one time and that any repairs needed in the future must come out of your pocket. It may cover the cost of any new parts but not include the installation of those parts too.

What Power Source Do You Need?

Though you might think that all of these products are precisely the same or quite similar, Navien makes different designs for homes that use propane and those that use natural gas.

Buying the wrong one for your system will cost you more money because you either need to ship the product back or pay contractors to change the system that your home needs. Some people made the mistake of buying the wrong one because they didn’t read the description carefully.

Though the manufacturer occasionally adds an “NG” to the end of a product name to distinguish which ones work with natural gas lines, it often uses the same full product name and model number. Always read through the description to see which one will work with the system in your home.