Navien Tankless Water Heaters 2020 Reviews

Tankless water heaters are versatile indoor accessories that have replaced standard tanked models in homes. Compact, for instance, they do not require a lot of space to work. Their high BTU designs produce hot water on demand, while their affordability and low maintenance designs are ideal for personal and commercial use. If you are renovating your home and want the best in this niche, Navien is a trustworthy brand. The technology used to manufacture its line of heaters is power-efficient. Safety is ideal, while its ease of installation and use benefits homeowners of all cadres.

8. American Standard TCWH199S-AS-NG

American Standard TCWH199S AS NG

Does the inefficient tanked water heater in your home frustrate you and other family members? To get a consistent flow of hot water without spending outrageous amounts, American Standard TCWH199S-AS-NG. A popular tankless heater globally, this ultra-low-Nox 199,000BTU tankless heater has a superior thermal efficiency (96%) compared to other models. Made of 304-grade steel (stainless), both its secondary and primary heat exchangers are durable. Its compact wall mountable design works well in homes, while its compatibility with both liquid propane and natural is admirable. If you are conscious about the environment, American Standard TCWH199S-AS-NG is Eco-friendly. Its ETL and Energy Star-certified system meets all Federal standard for both harmful emissions and power efficiency (14-15% better that tanked heaters).


  • Stainless steel heat exchangers
  • ETL and Energy Star-certified
  • Quality 199,000 BTU system

7. Navien NPE240S-NG

Navien NPE240S NG

Condensing tankless heaters such as Navien NPE240S-NG have improved how individuals produce hot water at home. Powered by natural gas, its efficient design is cheap to run. You do not spend hefty amounts on electricity bills, as is the case with traditional tanked heaters. Its compact design is easy to install, while the quiet preheating and heating technologies make it ideal for home use. Forget about the tanked heater in your attic that roars like mad whenever it is heating water. Navien NPE240S-NG is affordable, field convertible, and designed to work with most 1/2-inch gas lines.


  • Field convertible
  • Natural gas powered
  • Quiet and intelligent pre-heating
  • Easy to install

6. Rinnai RUC98iN Ultra Series

Rinnai RUC98iN Ultra Series

Rinnai RUC98iN Ultra Series is a powerful tankless heater with a space-saving in-house design that users appreciate. Designed to work with both PVC and concentric venting, its versatility is desirable. Installation is straightforward, while its high Energy Factor (.96) benefits individuals with large families. Every day, you will have an ample supply of hot water without paying hefty bills. Power output is approximately 190,000 BTU (maximum), while its ultra-low NOX emissions do not harm the environment. You will enjoy using one.


  • Power efficient
  • Very quiet
  • High (.96) efficiency factor
  • Fits PVC and concentric venting
  • 190,000 BTU
  • 5-year parts and 1-year service warranty

5. Takagi T-H3-DV-N

Takagi T H3 DV N

Are you tired of your high maintenance electrical heater? To low bills without compromising water output, buy Takagi T-H3-DV-N. Its gas-fired (natural) design is cheaper to run. It is also durable and has a desirable high flow system that generates up to 10 gallons of hot water per minute. In the morning, therefore, you do not have to worry about running out of water, as users of tanked heaters often do. Takagi T-H3-DV-N is space-efficient, has ultra-low Nox emissions, and has effective safety features (computerized).


  • Computerized safety features
  • High flow design (10GPM)
  • Uses affordable natural gas
  • Space-efficient design

4. Rheem RTGH-95DVLN


With Rheem RTGH-95DVLN, you get an efficient 9.5GPM tankless water heater that uses natural gas. Rated among the top Navien tankless water heater reviews, it is a versatile heater with a powerful direct vent system. Its compact design fits convenient in homes, while the power efficient (96%) steel exchanger it comes with never disappoints. At full power, it meets the needs of most homeowners while keeping power consumption low at the same time. Rheem RTGH-95DVLN has intelligent easy-to-use controls and a third-party listed design with a 3-inch 38-foot long PVC hose that lasts long.


  • 94% power efficiency
  • Long (38-foot) PVC hose
  • Stainless steel exchangers
  • Durable and space-efficient design
  • Low Nox emissions

3. Stiebel Eltron Tempra

Stiebel Eltron Tempra

Featuring a 240-volt electrical system, Stiebel Eltron Tempra is a dependable heater with a power and space-saving design. Featuring a digitized temperature control, this whole house heater is easy to customize. Its tankless design cuts electricity bills by 15-20% while its proven reliability is desirable. It does not break down easily. Flow is also consistent, while its durable non-vented design is easy to install in most homes. Redesigned inside and out, buyers get upgraded electronics (heavy duty). Flow is sensor-controlled, while its high working pressure (150PSI) satisfies the demands of most users.


  • High 150-PSI working pressure
  • Sensor-controlled flow
  • Upgraded electronics
  • Digitized temperature control
  • Power efficient 240-volt system

2. Takagi T-KJr2-IN-NG

Takagi T KJr2 IN NG

A dominant product in the tankless water heater niche, Takagi T-KJr2-IN-NG is a perfect indoor heater with an efficient gas powered design. Flow rate is approximately 6.6 GPM. Heat output is approximately 140,000 BTU, while its Energy Factor (0.81-0.83) appeals to individuals with a tight budget. You no longer have to spend tens of dollars on electricity to get a ready supply of hot water at home. Even though you have to buy stainless steel venting (category three) to use Takagi T-KJr2-IN-NG, its affordability is ideal. The outlet thermistors offered are also durable and customize to monitor temperature well.


  • Space saving design
  • High Energy Factor (0.81-0.83)
  • 140,000 BTU system

1. EcoSmart ECO 27

EcoSmart ECO 27

Top on our list, EcoSmart ECO 27 is a powerful 240-volt electric heater with a power efficient self-modulating technology. Power-efficient (up to 50% savings), its 112.5-amp system is per for day-to-day use. Temperature control (digitized) is easy to use, while the stainless steel and copper components it uses are professional-grade. They do not rust easily, as some comparable ones. Even though compact, its flow rate is impressive. Installation is also easier and its stylish design customized to blend excellently indoors.


  • Up to 50% cost saving
  • Durable stainless steel and copper components
  • Dependable electrical system
  • Space saving design