6 Best Takagi Tankless Water Heater In 2021 – Review & Buyer’s Guide

Surviving through the chilly and snowy weather requires a huge supply of warm water. The warm water’s existence in colder weather makes it easier for you to perform daily chores like taking a shower, washing utensils, and doing laundry. 

The introduction of the best Takagi tankless water heater has brought more comfort and relief during these strenuous times. They are highly energy-efficient and equipped with contemporary technology and incredible features. 

What makes them stand out from other devices is that their installation process is hassle-free and does not take much time. They are perfect for commercial and domestic purposes as they are pocket-friendly and durable. 

Their uniqueness is that they don’t have a tank or container to deposit hot water because they are wall-mounted. So, you can grab them to enjoy a continuous flow of water.

The Japanese name Takagi will definitely pop up whenever you are looking for stylish, eco-friendly, and reliable tankless water heaters

So, whether you are searching for an appliance for your new apartment or want to upgrade your existing unit, you can confidently pick a device by Takagi. 

This article list down our top six Takagi electric tankless water heater to help you get a notion on which type of heater you should choose for your office, restaurant, or house.

Takagi Tankless Water Heater Reviews

Takagi T H3 DV N Natural Gas Indoor Tankless Water Heater9.8

Takagi T-H3-DV-N Natural Gas Indoor Tankless Water HeaterFeature:

  • Delivers ten gallons of hot water on-demand
PriceRead our Review
Takagi T H3S DV N Gas Indoor Tankless Water Heater9.5

Takagi T-H3S-DV-N Gas Indoor Tankless Water HeaterFeature:

  • It gives you limitless warm water
TAKAGI TH3OSNG Tankless Water Heater9.5

TAKAGI TH3OSNG Tankless Water HeaterFeature:

  • Highly suitable for residential and commercial applications
Takagi TK 510C NI 199000 BTU Non Condensing Tankless Water Heater9.5

Takagi TK-510C-NI 199,000 BTU Non-Condensing Tankless Water HeaterFeature:

  • It comes with concealed combustion and power vent flue
Takagi TK 540P NIH Residential Natural Gas Tankless Water Heater9.4

Takagi TK-540P-NIH Residential Natural Gas Tankless Water HeaterFeature:

  • Converse energy for your residence
Takagi T H3S DV P Propane Indoor Tankless Water Heater9.5

Takagi T-H3S-DV-P Propane Indoor Tankless Water HeaterFeature:

  • The primary heat exchanger is made of commercial-grade copper alloy

1. Takagi T-H3-DV-N Natural Gas Indoor Tankless Water Heater – Best Overall

Do you have natural gas lines in your residence instead of propane lines? You will then appreciate what Takagi T-H3-DV-N Natural Gas Indoor Tankless Water Heater has to offer to you. 

Best Overall
Takagi T H3 DV N Natural Gas Indoor Tankless Water Heater

Takagi T-H3-DV-N Natural Gas Indoor Tankless Water Heater


  • Delivers ten gallons of hot water on-demand
  • Has gas input of 199,000 BTU per hour
  • Integrates controls and power cord
  • Computerized safety features
  • Complies with the ultra-low NOx emissions standards

It equips all the essential features but works with natural gas. It is designed for indoor deployment and has high thermal and energy efficiency. 

The machine produces ten GPM, so it is an ideal option for medium and large houses where several warm water fixtures are used at once. 

Due to its high flow rate, it can supply unlimited warm water in four bathrooms. The condensing ability of this Takagi gas tankless water heater makes its operation noiseless. It is an excellent option for those who love a quiet environment. 

Besides, it has the lowest nitrogen oxide emission rate. The gas input of this revolutionary machine is 199,000 BTU. It features a self-modulating heating mechanism and an energy factor of 0.95. 

It is the smallest device, so you can hang it anywhere you want. The installation process of this compact unit is super-easy and stress-free. 

The exciting thing about it is that it comes with a plethora of innovative control features and a 15-year warranty for the residential model, a 10-year warranty for the commercial model, and a 5-year warranty for parts. 

The bad news is that you can’t install it yourself, so you will have to hire professional services. Also, it requires a special venting and piping system, which can be pricier.


  • Item weight: 59 pounds
  • Size: Medium
  • Power source: Gas-powered
  • Voltage: 120 volts


  • Endless hot water
  • Compact design
  • Supplies water in up to 4 bathrooms
  • Highly energy efficient
  • Includes multiple safety features


  • Expensive deployment
  • Temperature drop issue

Note: This best Takagi tankless water heater is a great performer in the water heater industry. It has a higher flow rate, an energy factor of 0.95, and equips numerous safety features to ensure your protection.

2. Takagi T-H3S-DV-N Gas Indoor Tankless Water Heater

The primary difference between this heater and the above one is that it warms a small volume of hot water every minute. Depending on your house’s size, eight gallons of water in sixty seconds can be adequate for your daily needs. 

Great Value
Takagi T H3S DV N Gas Indoor Tankless Water Heater

Takagi T-H3S-DV-N Gas Indoor Tankless Water Heater


  • It gives you limitless warm water
  • The compact design makes deployment effortless
  • Allows you to save a lot of storage space
  • Meets the 2012 SCAQMD rule 1146.2 for ultra-low NOx emissions
  • Arms various safety features and does not have a pilot light

It offers you instant and on-demand water, and you will never have to wait to get it. On the other hand, it is an ultra-low NOx emissions Takagi tankless water heater outdoor, which means it can operate with all sorts of vents and prevent the released gas from harming your family. 

Moreover, this high-quality heater’s installation process is straightforward, so you can decide to hang it on your own. At the unit’s top, you will see metal connections attached to the pipes to permit water to come into the device, exit back, and into the plumbing system.

With the packaging box, you will acquire installation instructions. In case of a problem, you can contact the manufacturer on the toll-free number. Its gas input rating is 180,000 BTU per hour, so it provides warm water for your day-to-day activities. 

You can take advantage of it in both warm and cool climates. In cooler weather, it delivers water for two bathrooms. However, it provides water for three bathrooms in summers. 

Your residence’s temperature, external air temperature, and incoming water temperature will significantly impact how hot the water you will obtain.


  • Item weight: 65.9 pounds
  • Product dimensions: 11.25 x 17.75 x 24.88 inches
  • Size: Medium
  • Power source: Gas-powered


  • Gas input rating is 180,000 BTU per hour
  • Provides eight gallons of hot water
  • It comes with installation instructions by the manufacturer
  • Easier installation
  • Works quietly


  • A little bit pricy

Note: If you have a medium-sized family and live in a warmer climate, the Takagi T-H3S-DV-N Gas Indoor Tankless Water Heater is a fantastic choice. This superior quality unit provides you eight gallons of water without any wait and does not have a pilot light.

3. TAKAGI TH3OSNG Tankless Water Heater

This Takagi commercial tankless water heater comes without a tank, so you can fix it in tighter locations because it does not take much space. On the inlet and outlet, it has a thermistor that helps in monitoring the temperature. 

Premium Choice
TAKAGI TH3OSNG Tankless Water Heater

TAKAGI TH3OSNG Tankless Water Heater


  • Highly suitable for residential and commercial applications
  • Satisfies the ultra-low NOx rules
  • Heat exchanger tubing is made of commercial-grade copper alloy
  • It can be installed up to 10,000 feet altitude

It is an excellent option for radiant floor heating and residential applications. It is anticipated to function at up to 10,000 feet altitude. The number of hot water fixtures this device can handle is reliant upon the groundwater temperature. 

It was made in Japan and has a 15-year heat exchanger warranty that applies to stainless steel and copper exchanger. Additionally, it has a 1-year labor and 5-year parts warranty. So, you can buy this best Takagi tankless water heater without any tension. 

As a gas-fired device, you must hire a professional plumber and electrician for its installation to ensure your safety. 

You can take advantage of the warranty only if an expert hangs it. You obtain a user-friendly manual so that you can install it within the shortest time.


  • Item weight: 59 pounds
  • Product dimensions: 21.75 x 15.62 x 33.25 inches
  • Power source: Gas-powered


  • Easy to install for an expert
  • Outdoor installation
  • Built-in freeze protection
  • 135 degrees F default maximum temperature setting


  • Bit pricey
  • Makes noise during operation

Note: If you want to install a heater in your cabin, beauty salon, or residence, Takagi outdoor tankless water heater is an incredible option.
You can install it outdoor as it integrates a freeze protection system along with many other safety features. The only downside of this device is that it produces noise while working and is a bit expensive.

4. Takagi TK-510C-NI 199,000 BTU Non-Condensing Tankless Water Heater

The Takagi propane tankless water heater is wholly modulating, gas-powered, and comes without a container. It flaunts a power vent flue and concealed combustion. 

Takagi TK-510C-NI 199,000 BTU Non-Condensing Tankless Water Heater

Takagi TK 510C NI 199000 BTU Non Condensing Tankless Water Heater


  • Fully modulating gas-fired heater
  • It comes with concealed combustion and power vent flue
  • An ideal option for domestic applications
  • It can be utilized with storage containers
  • Meets the ultra-low NOx regulations

Besides, it has a recirculation mechanism and water storage boilers for your ease. The good news is that it satisfies the regulations of ultra-low NOx emissions. You can easily convert it from natural gas to propane.

Commercial grade copper alloy is used for making its primary heat exchanger, while the second one is made of high-quality stainless steel. Both heat exchangers are capable of resisting rust and corrosion, enhancing the device’s sturdiness.

Moreover, it features a centric vent and is certified by NSF for commercial usage. You can link the Takagi TK-510C-NI with several units using a multi-unit controller. 

On the other hand, it arms a wide range of safety features like overheat protection, freeze protection, surge protection, and troubleshooting error codes. This model is made in Japan and crafted for more extraordinary performance and resilience. 

It has a 15-year heat exchangers warranty, 5-year parts warranty, and 1-year labor warranty. Also, you get a user manual that explains the installation method. 

Keep in mind that you cannot install it yourself, so hiring a professional is mandatory. The warranty is applicable only if an expert will install it. If you have any questions, you can get in touch with them by using their toll-free number.


  • Item weight: 51 pounds
  • Product dimensions: 13.75 x 10.5 x 20.5 inches
  • Voltage: 120 volts


  • Energy factor of 0.82
  • Convertible from gas to propane
  • 15-year heat exchanger and 5-year parts residential usage warranty
  • 10-year heat exchanger and5-year parts commercial usage warranty


  • Users are not much happy with this product

Note: If you need a convertible Takagi commercial tankless water heater, give a shot to the Takagi TK-510C-NI water heater.
Its gas input rating is 199,000 BTU per hour, and it supplies continuous warm water for whole-house use. Best of all, it is covered by the long-term heat exchanger and parts warranties.

5. Takagi TK-540P-NIH Residential Natural Gas Tankless Water Heater

This best Takagi tankless water heater delivers limitless warm water whenever you need it. It converses energy for your house. 

Takagi TK-540P-NIH Residential Natural Gas Tankless Water Heater

Takagi TK 540P NIH Residential Natural Gas Tankless Water Heater


  • It offers you never-ending hot water
  • Produces 10 gallons of water
  • Converse energy for your residence
  • Features a compact design
  • Computerized safety features

It boasts a built-in recirculation pump with dedicated recirculation lines to provide instant hot water for domestic usage. You can control the pump with the help of a straightforward user interface and numerous settings. 

The pump settings empower you to personalize the pump operation to meet your specific requirements and maximize the device’s energy efficiency. 

This machine produces ten gallons of hot water in one minute, so it is a fantastic option for whole-house use. It meets the rules of SCAQMD 1146.2 ultra-low NOx of less than 20ppm. 

Commercial grade copper is used for constructing its primary heat exchanger that can resist rust and corrosion. On the other hand, type 316L stainless steel is utilized for manufacturing the secondary exchanger that can also resist corrosion. 

It incorporates many safety features such as air-fuel ratio sensor, overheat, freeze protection, troubleshooting error codes, and many others to ensure you and your family’s safety. 

Moreover, you obtain a 15-year guarantee for domestic usage and a 5-year warranty for commercial use.  


  • Item weight: 61 pounds
  • Package dimensions: 25 x 18 x 11.25 inches
  • Batteries required: No


  • Reliable manufacturer
  • Budget-friendly heater
  • Well-built
  • Eye-catching design
  • A great option for residential and commercial applications
  • Excellent warranty


  • Lesser temperature range than other models

Note: Are you on the lookup for a powerful Takagi electric tankless water heater that can fulfill the entire house’s hot water needs? Look no further because Takagi TK-540P-NIH is here to satisfy your requirements.
This mid-range machine has a compact design, generates 10 gallons of water, and integrates various safety features.

6. Takagi T-H3S-DV-P Propane Indoor Tankless Water Heater

This Takagi indoor tankless water heater is a powerful device that can efficiently meet your entire house’s needs. You can conveniently attach it to other residential units by using the easy link-up cable. 

Takagi T-H3S-DV-P Propane Indoor Tankless Water Heater

Takagi T H3S DV P Propane Indoor Tankless Water Heater


  • Computerized safety options
  • No pilot light
  • Meets the ultra-low NOx emissions regulations
  • Space-saving design
  • The primary heat exchanger is made of commercial-grade copper alloy

If you use a multi-unit controller, you will be able to connect up to twenty units. It is a one-stop solution that can produce 10 gallons of hot water for you. 

As it has a higher flow rate, so it can deliver water to four bathrooms in warm weather and three bathrooms in colder weather. 

If we talk about its energy efficiency rating, it is 95% energy-smart and is certified by Energy Star at the same time. The primary heat exchanger of this Takagi tankless water heater outdoor is made of commercial-grade copper alloy. 

You can rest assured to get 25X better warmth transfer than stainless steel. Besides, its secondary exchanger is built by using stainless steel for rust and corrosion resistance. 

If you are hesitant to install a tankless gas appliance in your house because of safety concerns, then eradicate all your fears because the brand has incorporated several safety features in this machine to prevent harm to your family and property. 

These features shield it from damage due to energy surges, freezing, and excessive heating. Best of all, the Takagi T-H3-DV-P complies with ultra-low NOx emissions rules and discharges less than 20ppm of NOx, which makes it an environment-friendly heater.


  • Item weight: 58 pounds
  • Product dimensions: 11.25 x 17.75 x 24.88 inches
  • Size: Medium
  • Power source: Gas-powered
  • Voltage: 120 volts


  • Eco-friendly unit
  • Multiple security features
  • Can be linked with numerous domestic units
  • 95% energy efficient
  • 180,000 gas input
  • Produces 10 gallons of sizzling hot water


  • Expensive

Note: The Takagi T-H3S-DV-P is perfectly suitable for commercial and domestic applications. You obtain 10 gallons of water in a minute, which is more than enough to cater to the needs of a mighty family with 3 to 4 bathrooms.

Buying Guide For Takagi Tankless Water Heater Outdoor

Introduction Of Takagi

Takagi is one of the leading tankless water heater companies worldwide. They have been serving their consumers since 1952 by providing them high-quality products and solving their water and heat-related issues. 

They are inventors in refining the thermal efficiency of the units. Their appliances operate on an air-fuel ratio sensor, ensuring your house and machine’s security. 

They produce indoor and outdoor gas heaters for residential and commercial use. The residential ones have two types: non-condensing and condensing units.

The majority of their units work on natural gas, but some also use propane. The indoor ones require a direct vent for maximum energy savings. 

Prices of Takagi propane tankless water heater are slightly higher than the natural gas ones. Moreover, the outdoor models are costly than indoor ones. 

Installation Of Takagi Propane Tankless Water Heater

Takagi heaters are powered by natural gas and propane, so to confirm your security, you must hire a specialized plumber for the deployment. If you install it on your own, you will negate the guarantee. 

Its installation is straightforward and takes the shortest time after you have selected the location where you want to hang it. If gas or recirculation pipelines are not required, the process will be even faster. 

The installation of an outdoor unit is easier and faster than the indoor one. If you have to replace and dispose of your existing device, the deployment duration will increase. 

The brand provides comprehensive instructions for installation; it means non-technical individuals can fix it without facing any problem.  

Repair And Maintenance Of Takagi Devices

Users rely on Takagi because their products lack severe perfunctory issues. In the initial ten years, only 10 percent of consumers experience problems, and the majority of these issues occur due to incorrect deployment. 

So, if you don’t want to deal with mechanical problems, hire professional installation services and keep up with maintenance. 

Like other heaters, Takagi appliances also need regular maintenance and inspections to ensure they are in good working condition. Other than that, additional care is not imperative.

What Are The Types Of Takagi Heaters?

There are mainly two types of Takagi units: gas-powered and propane-fired heaters. You can choose any type depending on your house and preferences. Let’s understand what the difference between the two is. 

Portability And Usability

Natural gas is useful for bigger houses where warm water is needed continuously in different areas for various purposes like baths, laundry, and much more. 

If you live in a colder climate, you should pick natural gas as a fuel because it performs efficiently despite temperature drops.

On the other hand, propane gas is portable than natural gas because it comes in containers. It may seem like a problem for many folks as cylinders take some storage space. 

But you should take it as an advantage because you can put the canisters in any corner of the house. You can take advantage of it to fuel other appliances such as a washing machine, dryer, stove, and others.


Propane gas is delivered in canisters, but natural gas comes through pipelines that dispense it in the entire house. These pipes are not available in many parts of the world. 

If your area or residence does not have gas pipelines, you should buy the propane-powered Takagi indoor tankless water heater. However, if you want to install the gas one, you will need to upgrade your house’s infrastructure.


According to stats, natural gas is cheaper than propane, and it is measured in price per cubic foot. Besides, propane is measured in cost per gallon. The actual price depends on various factors. Nowadays, we use BTUs or British Thermal Unit to calculate the price. 

BTU refers to the heating efficiency of Takagi commercial tankless water heater. Propane’s BTU rating is 2490, and natural gas’s rating is 1030, which means gas is cost-effective. Propane is also beneficial as it is cleaner and ignites well.

What Sort Of Warranties Does Takagi Offer?

The warranty gives a sense of confidence and security to customers, and the creators of Takagi are familiar with this concept. That’s why; they offer a limited guarantee to their consumers. 

With the guarantees, the users obtain some legal rights, and these rights may differ from country to country. Takagi provides three different sorts of warranties: a 15-year heat exchanger warranty, a 5-year parts warranty, and a 1-year warranty for labor. 

The parts warranty means if any of the unit’s components are not functioning accurately in the initial 24 hours of deployment, the brand will be liable to fix them.

The heat exchanger guarantee means if the stainless steel or copper exchanger fails within 15 years after installation, the brand will fix it. 

The warranties are appliance only if a certified plumber and electrician will install the heater; otherwise, you won’t be able to enjoy the benefits of warranties.

What Are The Features Of Tankless Water Heater Takagi Review?

Takagi is a prominent company globally, and its fame did not originate from thin air. They have been successfully satisfying their users’ needs by providing them great quality products. In each of their product, they have incorporated incredible features, which are:

Water Flow

Their high-end commercial models flaunt condensation features that lower the detrimental effect of this phenomenon. The redesigned water flow ensures the distribution of new water. 

The reason is that the exchanger cylinder and coils are placed higher than the dew point to decrease the condensation hazard. 

Additionally, the exchanger fins’ pitch is wider so that it reduces the obstruction risk, increases robustness, and keeps the condensation possibilities minimal. This arrangement retains higher temperatures on the upper coils.


Takagi makes gas heaters, so they are aware of risks that are associated with gas. Each Takagi outdoor tankless water heater has several safety features such as freeze protection, overheat protection, and much more, so you will feel secure while using Takagi’s tankless appliances.

Water Valves

Takagi strives to obey every part of their commercial standards. They have improved the quality of heat exchangers and water valves to a great extent. 

Their machines are famous for their sturdiness, high performance, and longevity as they integrate bypass and flow adjustment valves. These valves can resist high volume and unforgiving conditions commendably. 

Freeze Protection System

This mechanism is installed in all heaters to confirm proper safety against freezing of water in colder weather. It prevents the water temp from dropping under a certain level to provide hot water on-demand.


Takagi tankless water heater vaunts a commercial-grade copper alloy heat exchanger with 8X strength than regular copper, making it sturdier. It is more resistant to rust and corrosion than other heat exchangers. 

Moreover, 25% thicker drums avert the destructive effects of thermal development after various burning cycles. 

In the condensing heaters, the 316L stainless steel secondary exchanger is responsible for taking care of the rest of the heat distribution. Stainless steel is used for making this exchanger because the lower temperature could cause acidic condensation.

Air-Fuel Ratio (AFR) Sensor

In terms of safety, the manufacturer took things to the next level by installing a distinct air-fuel ratio sensor. This sensor observes the quantity of used air and fuel 24/7 to guarantee a balanced grouping between materials. It is necessary as it delivers combustion and reduces gas leakage.

Overheat Cutoff Fuse

When there is a combustion breach, the heat exchanger’s surface absorbs excessive heat. In such a case, this feature will turn off the heater.

Hi-Limit Switch

It prevents the water temp from reaching unsafe levels. Nobody wants to get burned during their shower, so it separates the gas valves when the temperature surpasses the safe limit and turn off the appliance.

Frequently Asked Questions

Q. Where Takagi Manufactures Tankless Heaters?

Takagi gas tankless water heater are manufactured in Shizuoka, Japan. In 2010, the brand announced that they have had established a joint venture with A. O. Smith to market and construct tankless machines in North America.
This agreement’s primary purpose was to bring the production of some devices to the United States—once they completed a specific number of sales in Canada and the USA.

Q. How Long Does The Best Takagi Tankless Water Heater Last?

The life expectancy of Takagi machines is more than 20 years. They have replaceable components that enhance their life by numerous years. On the other hand, traditional tank-style units last for 10 to 12 years only.

Q. Tank Or Tankless unit: Which Option Is Better?

Tankless heaters are better than tanked ones because they are energy-efficient, compact, and long-lasting. Gas tankless devices can help you save up to $100 every year.
The households that consume 40+ gallons of hot water regularly should use tankless ones because they can help them save up to 24% to 50% on energy expenditures.

Q. Does A Tankless Hot Water Heater Add Value To Your Home?

If you want to enhance the worth of your property, you should install a tankless heater. According to a study, residences with tankless appliances sold 45 days quicker and 4 percent more than their estimated worth.


Takagi is famous for producing superior quality water heaters with exceptional flow rates in high elevations where many appliances fail badly. Their products are well-built and perform commendably.
Many units have a compact design so that you can fix them in non-traditional places. Best of all, most of the best Takagi tankless water heater are certified by Energy Star. It means you can save dollars while the device is operating. They are not only energy-efficient but safer to use as well.
Now, all the information about the Takagi water heaters is in front of you. We are 100% sure it will help you to make an informed buying decision. So, pick a machine based on your needs and budget.

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