Navien Tankless Water Heaters Review

Navien isn’t exactly a household name, but it should be. This company is at the forefront of tankless water heater and boiler technology. Owning a Navien tankless water heater means lower bills and a much smaller carbon footprint.

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They also have a higher compatibility with your existing water system and longer-lasting parts so you can save money from the moment you purchase a unit. It’s time to get to know one of the best tankless water heater companies and why they’re a secret you’ll want to share.

The History of KD Navien Co., Limited

KyungDong Navien is a younger company, having been founded in 1978. Ten years later, it began making an impact by being the first Asia-based company to develop a high efficiency condensing boiler that was environmentally friendly. The company’s reputation grew as they achieved high-level certifications across several continents.

Over the years, KD Navien has expanded its products to include HVAC and numerous home systems. All of these share a focus on greener living and higher efficiency. Today, the company has two branches in Asia, as well as one each in Europe, Australia, North America, and South America.

As they are a younger company, their name isn’t as well-known as Rinnai, Rheem, or even Noritz, but KD Navien has worked hard to excel these older companies in both efficiency and environmentalism.

Tankless Water Heaters

Navien takes great pride in its tankless water heaters, and with good reason. These heaters have some of the highest efficiency ratings on the market and are also among the greenest. Two tankless lines are available, the NPE-A and NPE-S.

Common Features

All Navien tankless water heaters hold to a high standard, providing both ENERGY STAR and LEED certifications. They also use condensing technology to reduce your water bill and provide on-demand hot water with no wait time.

The controls are easy to use and Navien water heaters can both common vent up to 8 units and cascade up to 16 units, making them perfect for apartment complexes as well as single family homes.

NPE-S Line

The standard line is quite impressive on its own, and has many design features geared towards reducing installation costs. This higher affordability doesn’t reduce the level of quality, however. An outstanding .97 UEF rating makes this one of the most efficient lines on the market, and many of the components are designed to require less maintenance than non-condensing models.


The advanced line provides more quality than just about any other tankless heater on the market. Starting with a Uniform Energy Factor (UEF) of up to .96 and low NOx ratings, these units include ComfortFlow recirculation technology to eliminate cold periods.

To provide additional savings, the recirculation pump can be deactivated. These heaters can provide up to three LEED points and will help reduce your home’s HERS index score. The advanced series can also be Wi-Fi enabled with the NaviLink add-on.

Best Navien Tankless Water Heaters

ModelGallons/MinuteMax BTUsEnergy FactorNotes
NPE-240A11.2 GPM199,9000.96recirculation system
NPE-240S11.2 GPM199,9000.97low operating costs
NPE-210A10.1 GPM180,0000.96recirculation system

Navien Tankless Water Heater Parts

When maintenance time rolls around, your Navien water heater shouldn’t be passed over. As with all tankless heaters, corrosion is less of an issue than with normal tanks, but some parts will wear out over time.

Valves, vent parts, and filters will all degrade over time. Electronic parts, such as the control panel, may also need maintenance once every few years to replace any loose or damaged components. When issues arise, pay attention to any error codes from your Navien control panel to help with troubleshooting.


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Where to Buy Navien Tankless Water Heaters

Navien water heaters are currently not available at big box home improvement stores such as Home Depot and Lowes. You’ll instead find Navien models on and smaller online retailers as well as local distributors.

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  1. I don’t want to be negative about my Navien tank from the begining so I will let you be the judge if I can be negative or not…
    -I paid close to 3000$ for my tankless hot water tank – 2 to 3 times more than a conventional gas heated, power vented water tank. I was willing to pay the price and expected equivalent longevity to a conventional gas heated water tank.
    – it lasted 8 years before what appeared to be a flow sensor break down. A conventional hotwater tank lasts between 15-20 years
    – 400$ for a new flow sensor and labour did not fix the problem, it was determined that it was the mother board
    -700$ plus tax, plus labour would have the tankless H20 heater online again
    -total 1100$ equivalent to a brand new gas heated, power vented water tank
    -Navien has proprietorship of the parts in the water tank so parts need to be ordered from Navien – time delays and higher than normal cost for replacement parts
    – Navien technicians on their support line will only tell the homeowner to ‘switch the power off, wait 30 secs, then turn it on”. They won’t deal with anyone other than a licensed technician.
    – consequently the Navien tank got recycled for copper and a new gas heated, power vented hotH2O tank was installed

    I don’t want to limit my bashing to Navien, but to all tankless water tanks and their respective companies. They are over priced, the quality is not comparable, and they have a monopoly on their parts. Sure, I enjoyed the tankless water tank for 2 reasons: 1) the practicality of having the water tank on a timer and 2) the psychological advantage of saving gas because gas is not burned on a regular basis to constantly heat a large tank of water. However, the enjoyment was short lived and the repairs expensive when compared to a conventional gas heated water tank. Upon reflection, I would never spend 2000$ (the difference in price between a conventional tank and a tankless unit) on gas used to heat water in a conventional tank over an 8year period.

    Am I allowed to be negative?

  2. I have had 3 of these installed in my apartments. They are both the hot water heater and provide floorboard hot water heat. Each cost more than $4,000 to install. I have had nothing but problems with tenants complaining. The biggest problem is the amount of water flow needed to kick on the hot water is HIGH. Forget using a low-flow shower head or anything else. All low flow restrictors have to removed from faucets and shower heads in order to have enough umph to get the hot water tank to kick on. I complained about this to my plumber, and he confessed that he often drilled out customers’ shower heads in order to make the necessary flow happen. I will now be drilling out all my tenants’ shower heads and faucets. What that means, being on city water/sewer, is my water bill will go up considerably. Also, it already goes up with these units as it does take (wasted) water to flow through the unit to kick it on. So you choose – a higher water bill and frustration to save a few dollars on my natural gas bill. It’s not a wise trade off.

    • I do agree that one of the hardest things to get used to with tankless models is the minimum flow rate for the water heater to kick on. This makes trying to save on water usage difficult.

  3. I do agree these can be frustrating. I own several Navian systems including the latest combo-boiler. They are efficient and space saving. They can be repaired yourself if you have the interest or ability. The parts are usually inexpensive. It’s the expertise that’s in short supply. Flow sensor is $25 and takes 15-20 min to install. The lifetime of the earlier models was around 7 years. I’m getting ready to replace a 9 year old one.

  4. A conventional hot water tank lasts 15-20 years?? Maybe 20-40 years ago… not now! Lucky to get a decade out of one. Everything is built to die.. hot water tanks, furnaces, washers, dryers…

    It’s the world we live in now.

  5. I have had a Navien Combi for 4 years. Spent $2,750 repairing it and now it’s rusted out internally, leaking and on the brink of completely breaking. Worst combi boiler ever.

  6. I replaced my furnace and hot water tank for a Navien Combi. Biggest piece of crap I can recall purchasing. Warranty covers replacement parts, provided you are a licensed technician making the repair. Unit is only two years old. Lost heat during the winter as an electronic relay directed the system that unit pressure was too high and redirected water flow to pressure relief valve causing a flood in basement. $650 plumbers fee to have Navien send me a valve which took me 5 minutes to repair. 2 months later, now I have no hot water. Technician needs to speak with licensed contractor to verify that mother board is likely the problem. I had conversation about this piece of crap boiler with a friend today who had similar and many more problems with his two year unit. He has since junked his. Think hard about a purchase if you are considering one.

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