Navien NCB 240 Review: Everything You Need To Know

Navien NCB 240 review

If you’re thinking of buying a Navien NCB 240 boiler for your home, you’ve come to the correct site. The Navien NCB 240 is equipped with advanced technology to provide reliable and cost-effective heating solutions for your home. This Navien NCB 240 review will provide an overview of this powerful and efficient boiler.

From its ultra-quiet operation to impressive energy savings potential, this boiler is packed with features that make it an excellent choice for homeowners. With this review, you can make an informed decision on whether or not the Navien NCB 240 is the right boiler for your home.

Complete Overview On Navien NCB 240 Review

Navien stands out from its rivals due to its combination of a water heater and a hydronic system boiler.

Areas with limited space often need help accommodating a substantial tank to provide hot water for a hydronic heating system. Besides needing a greater energy output, tank water heaters also have other problems, such as proper ventilation, debris accumulation, and other issues that make Navien products a great option.

The Navien NCB 240 Tankless Water Heater can resolve all worries.

Navien NCB 240 Review: Technical Specifications

This Navien NCB 240 review will provide an overview of this powerful and efficient boiler.

Here are the technical specifications of Navien NCB 240 review: 

  • Electronic ignition
  • 3% thermal efficiency rating
  • 84lbs (38.1 kg) weight
  • PVC, CPVC, or Polypropylene Cent venting system
  • 17 inches (43.2 cm) x 12 inches (30.5 cm) x 28 inches (71.2 cm) dimensions
  • Natural Gas or Propane fuel
  • 4.5 gallons per minute flow rate
  • Indoor mounting location
  • Stainless Steel (2) heat exchange
  • 1-year warranty for labor, 5 years warranty for parts, and 10 years warranty for heat exchangers

Navien NCB 240 Review: Features And Benefits

Here are the features and benefits of Navien NCB 240: 

  • Advanced heat retention technology – Navien NCB 240 has a unique condensing efficiency that minimizes system temperature loss
  • Eco-friendly – A reduction of 75% in NOx and CO emissions
  • Automatic water filling system – It reduces consumer maintenance requirements.
  • Efficient water heating – Navien NCB 240 saves money on utility costs
  • Stainless steel construction – It increases product durability while reducing maintenance.
  • Illuminated control panel – Navien NCB 240 offers easy-to-see temperature details & diagnostics
  • Combination boiler & heater – It removes the requirement for two water heating systems.

Navien NCB 240 Review: Pros And Cons

The Navien NCB 240 has some positive features. However, I experienced a few issues that I had concerns about. Here is a brief overview: 


  • Compact design
  • Eco-friendly
  • 4.5 GPM high flow rate
  • No requirement for two separate heating solutions
  • 2-in-1 Unit – Tankless heater & Hydronic system boiler
  • Energy efficient
  • Easy access to the front control panel
  • Dual stainless steel heat exchangers


  • Durability issues
  • Price is between $2,200 and $3,600, depending on the source
  • Control Panel is hard to operate

Navien NCB 240 Review: Things To Consider Before Buying

Navien combo boilers are an excellent way to upgrade hydronic heating systems in residences, condominiums, apartments, or business offices and provide hot water on demand. The machinery is constructed with high-quality materials to ensure a long-lasting lifespan.

The installation of Navien’s residential, wall-mounted water heater is enhanced by its heat exchanger system, as well as the easy-to-install venting and water line connection points.

When homeowners need a heating system that is highly efficient and also provides hot water on demand, this design works excellently in fulfilling both requirements. Because the NCB 240e is both a boiler and a heater, the engineering needed to build it is more intricate, yet the setup has been simpler.

Homeowners skilled in DIY projects can install HVAC systems themselves. Still, you can hire a professional to ensure the process is done correctly and avoid potential issues.

Navien NCB 240 Review: Social Proof & Reviews

Both good and bad remarks were given concerning the Navien NCB 240 review. Examining the feedback and opinions of people who bought the Navien Boiler combo on the web made me anxious. Here are a few illustrations: 

One of the reviewers considered Navien NCB a good deal in the plumbing & heating business. Another reviewer claimed that you need a licensed plumber for troubleshooting issues.

One reviewer shared that he has read many negative comments about early Navien products. The initial products’ root causes can be either defective components or inadequate installation and lack of problem-solving knowledge among plumbers and DIYers.

Thankfully, his decision is an exemption to the unfavorable feedback since you had the structure set up two months ago and are currently using it to keep warm in the winter season. In addition, the heating is perfect and silent. The product is cutting the monthly gas bill in NYC.

In conclusion, the reviews of Navien’s product vary drastically, so it is best to have a professional install it. Additionally, it is essential that those who have recently acquired the system read the Owner’s Manual carefully before using it.

Navien NCB 240 Review: Competitive Comparison

The Navien tankless hot water product has so many modern features that it wouldn’t have many other challengers in the market.

Nevertheless, a few products almost identical to the Navien NCB household hot water system are available.

Stiebel Eltron Tempra Plus

Navien NCB 240 review

The Hydro Shark® Modular Panel hydronic water heating system offers hot water for central heating and hot running water from the tap. This system necessitates more space on the wall due to the combination of two discrete components, a hot water boiler, and an inline water heater.

The expense of a Stiebel Hydro Shark® is similar to that of a Navien NCB 240e, depending on the size of the space that needs heating. The Hydro Shark® is available in both natural gas and electric-powered versions.

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Rinnai RUR


Rinnai offers a wide selection of tankless domestic hot water boilers and in-line heaters. The RUR product range contains small-scale and large-capacity systems, all of which come with stainless steel heat exchangers such as the NCB 240.

Rinnai items are available in more petite and concise shapes, and some can be put on the outside of a construction. Prices for the products are similar.

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Ecosmart Eco 27


The Ecosmart domestic water heater has a high capacity and can warm up to 6.5 gallons of water in a single minute. This apparatus was not created to be a typical boiler unit. Instead, it was engineered to be a whole-house tankless hot water system.

An Eco 27 would require installing a new hydronic boiler system, which would require additional wall area. In addition, the Eco 27 tankless heater for residential use is more affordable than the Navien NCB 240 because it has limited functionality in regulating the temperature in the home.

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FAQs (Frequently Asked Questions) On Navien NCB 240 Review

1. Is Navien tankless water heater a good brand?

Navien offers best-selling condensing and non-condensing tankless water heaters, combi-boilers, and boilers. Navien tankless water heaters are a step ahead of the competition with their advanced technology, and they offer dependability and efficiency that surpasses other available brands.

2. Is Navien a good boiler?

Despite having relatively limited scope, Navien is one of the leading manufacturers of combo boilers on a global scale. They offer excellent value with their reasonable cost, superior quality parts, and modern capabilities (plus a 7-year guarantee).

3. How long does a Navien boiler last?

Many Navien boilers come with a 10-15 year guarantee for residential usage, which varies depending on the model. If a boiler is taken care of and part of a system is built and installed correctly, it can last for up to two decades or even longer in certain situations.

4. How long does a Navien tankless last?

If you install a tankless water heater now, it can be expected to last for two decades.

Summary: Navien NCB 240 Review

The Navien NCB 240 review says it is a compact, attractive, and efficient combination boiler and water heater. It has stainless steel heat exchangers to help prevent corrosion and other unhealthy metal buildups. The unit is ideal for installing gas or propane fuel in small spaces and homes. 

With its Eco-Friendly features, the Navien is an excellent choice for those concerned about the environment and cost-efficiency. Navien NCB 240 Heater is also available on Genie Parts and Navien Parts.

It contains everything you need to provide hot water on-demand in a compact, wall-mounted unit, including a low-flow pump, dual stainless steel heat exchangers, and an illuminated control panel.

The only drawback to this product is its price, which is between $2,200 and $3,600, depending on the source. While it is an excellent investment, it is not for everyone.

I hope this article on the Navien NCB 240 review sounds helpful!

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