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Takagi Tankless Water Heater Reviews

Do you want to know what series Takagi has introduced in the market?

Takagi is a Japanese brand that stepped into the US market after 2010. Furthermore, the heaters belong to Takagi demands less maintenance, in addition to quality and enhanced safety. It does not produce an electricity-powered water heater. But, natural gas acts as the main power source. Let us tell you that the propane type is also available in today’s market.

At present, people know about Takagi due to its unique products and technology. Its increasing demand has forced us to write Takagi tankless water heater reviews for your sake. In this post, we have tried our best to throw light on all types of series.

Takagi Tankless Water Heater

The different products are available that belong to unique series that can be used on a residential or commercial level. Their flow rate also differs from providing a wide variety according to location and usage. We proudly say here that Takagi is as good at functioning as any other well-known brand.

Takagi Tankless Water Heater ReviewsTakagi Tankless Water Heater Reviews

Top 5 Takagi Tankless Water Heaters



Price/ Rating

Best Overall


7.5 GPM 0.82 Energy Factor Rating Gas, Outdoor

Best Overall


Max GPM 8 0.80 Energy Factor Rating Natural Gas, Indoor

Premium Choice

Hydro-Logic 31035


Max GPM 6.6 0.82 Energy Factor Rating Natural Gas, Indoor

Best On Budget

Hydro-Logic 31035


Max GPM 10 0.93 Energy Factor Rating Natural Gas, Indoor or Outdoor

Best On Budget

Hydro-Logic 31035


Max GPM 6.6 0.93 Energy Factor Rating Natural Gas, Outdoor

Best Overall

Takagi T-KJR2-IN-NG

1. Takagi T-KJR2-IN-NG

7.5 GPM, 0.82 Energy Factor Rating, Gas, Outdoor

  • The Takagi T-K4-OS is a propane outdoor tankless water heater that provides hot water for your outdoor living areas.
  • This unit has an 8 gallon per minute maximum flow rate and is designed to produce 190,000 BTUs of heat.

The T-K4-OS can be installed outdoors with no need for venting thanks to the included thermal expansion valve which allows it to operate at lower pressures than most other models on the market. Takagi T-KJR2-IN-NG tankless water heater has been built specifically for a small house that demands less flow rate. This model of Takagi comes at less price and serves you for a longer duration. With the smaller size, its weight is approximately 38 pounds. No doubt, this model is the point of use type but, you can enjoy the warm water in two supplies at once.

In short, if you need a smaller and compact water heater that uses natural gas as a power source, Takagi T-KJR2-IN-NG should come to mind at once.


When it comes to performance, Takagi T-KJR2-IN-NG delivers the same amount of water that is offered by a tank water heater of 40 gallons. From all the series introduced by Takagi, Takagi T-KJR2-IN-NG is the smallest of all.

This model gives you uniform temperature distribution. Some brands come with a feature of temperature limitation. Takagi has solved this issue by ensuring continuous temperature in every case. This is so, and the technology works effectively to set the water temperature at a specific point.

It is equipped with an air-fuel ratio sensor and thermistor to provide the same temperature. This function left you with the confidence to enjoy a consistent temperature. In this way, the efficiency of this tankless water heater never gets disturbed.

When we talk about the environmental effects, it is worth noting that the mentioned product does not release a very high amount of harmful gases to the surrounding. In this way, this product is announced as environmentally friendly.

Additionally, the control system of this water heater shut itself down in case of overheating. This feature works due to the availability of a temperature control system. This is the single model in the non-condensing series that is offering this safety feature.

If you live at altitude, use the integrated DIP switch to adjust the performance accordingly.


Takagi T-KJR2-IN-NG does not demand electric power to provide you warm water. It uses the out power between 19500 BTUs and 140000 BTUs offered by natural gas. This feature lets you save from wasting energy.

Exploring the flow rate, Takagi T-KJR2-IN-NG comes with a capacity of 6.6 gallons per minute. This limit can vary based on your need.

In warmer surroundings with the groundwater of 70F, it would give plenty of hot water for two bathrooms. Alternatively, in the colder surrounding, it would serve one bathroom where groundwater is 50 F. It can be said that either you live in hot or cold, Takagi T-KJR2-IN-NG is always ready to serve you.

Hydronic baseboard and radiant floor work collectively to ensure next-level efficiency and enhanced utility. The temperature can be managed according to your requirements by the use of a remote that comes with Takagi T-KJR2-IN-NG.


Takagi advises you to mount this heater indoors to save it from the external environment. It comes with a detailed manual that directs installation to assist you. Like other brands, Takagi suggests you get the favor of some professional for successful installation followed by your family’s safety.

This tankless water heater uses natural gas as an essential power source. The venting is outdoor that can be done vertical or horizontal.


Takagi T-KJR2-IN-NG comes with a warranty time of 10 years for the heat exchanger and 5 years for its parts. Keep in a notice that this warranty time may revert to zero if you try DIY installation followed by any damage. The company does not take responsibility for any damage that is done by your negligence.


  • It comes with multiple protective features, including freeze protection, surge protection, and more.
  • The construction is compatible with the hard water supply
  • The installation comes with flexible, usable options
  • Efficiency is enhanced with integrated DIP switches
  • Small and compact design fits best with narrow space all the time


  • The installation may cost you additional dollars
  • Flow rate is not sufficient to entertain a large home
  • It may produce noise during working

Best Overall

Takagi T-K4-IN-NG

2. Takagi T-K4-IN-NG

Max GPM 8, 0.80 Energy Factor Rating, Natural Gas, Indoor

  • The Takagi T-K4-OS is a propane outdoor tankless water heater that provides hot water for your outdoor living areas.
  • This unit has an 8 gallon per minute maximum flow rate and is designed to produce 190,000 BTUs of heat.

The T-K4-OS can be installed outdoors with no need for venting thanks to the included thermal expansion valve which allows it to operate at lower pressures than most other models on the market. This model of Takagi can run both on natural gas and liquid propane. Takagi T-K4-IN-NG is safe to use for the environment and comes with nicer energy efficiency. Plus, its flow rate is high so, it can be used for a larger home with a greater need for hot water.

It can be mounted on a wall due to its compact and smaller size. Though the size is smaller yet, it can serve a large home. With the consistent flow of warm water, you would encounter minimal fluctuation. Its efficiency is high enough to support commercial needs in addition to residential.


With the advanced design, Takagi T-K4-IN-NG tankless water heater is safe for the environment and convenience and reliability. It is equipped with a thermistor, an air-fuel ratio, and a microprocessor to serve you well.

When talking about performance, the advanced ignition system comes at the top. The heating system is monitored continuously. The parameters are controlled, in addition to water and gas flow. The main aim of these functions is to the temperature accuracy.

A computer chip is integrated into Takagi T-K4-IN-NG that saves this water heater from shutting down. This problem may arise commonly due to faulty gas combustion, least air intake, clogged vents, high temperature, and more.

Efficiency And Power:

This model of Takagi comes with full modulation. This capacity allows you to work with the power output of 11,000 BTUs to 190,000 BTUs. With an energy factor of 0.82, it is lower than condensing type but still excellent to be served.

You can use it with confidence when needed and enhanced water flows due to an integrated modulating gas valve. Similarly, the same feature works the same when you need a reduced flow rate.


The maximum flow rate offered by Takagi T-K4-IN-NG is 8 gallons per minute. It is estimated that the single shower demands 2 gallons per minute. If you live in a warmer area, this water heater will entertain 3 to 4 fixtures simultaneously.

Manufacturers have recommended that the colder area allows Takagi T-K4-IN-NG to entertain 2 or 3 fixtures at a time.


This model comes with 4 integrated temperature settings with a maximum limit of 140 Fahrenheit. You can use DIP switches to manage the temperature; alternatively, the remote control can be used for this purpose.

Safety And Troubleshooting:

Takagi T-K4-IN-NG is equipped with a self-diagnostic system. It detects the problem itself and lets you know by producing red light. This might appear on the computer board in the absence of a remote.

On the opposite side, when you use a remote, the same indication is shown by the error code on the remote screen. The main aim behind this technique is to enhance safety in addition to convenient troubleshooting.

The operation is very safe with integrated freeze protection. This system gets activated in the presence of groundwater less than 36.5 Fahrenheit. This system works in the presence of electricity. Other protective features include a hi-limit switch, pressure relief valve, thermistor, flame sensors, water flow sensors, and more.


For residential use, Takagi T-K4-IN-NG offers a warranty time of 1 year. If you want to use it commercially, you are offered a warranty time of 10 years. Other elements enjoy a warranty time of 5 years.


  • The remote control offers the smooth operation
  • It has a self-diagnostic system that is efficient to provide constant performance
  • The safety features are provided for protective usage
  • The warranty time is perfect for providing non-stop service
  • The design is compact and small to fit a narrow space


  • It comes with four specific temperature settings

Best Overall

Takagi T-K3-N

3. Takagi T-K3-N

Max GPM 6.6, 0.82 Energy Factor Rating, Natural Gas, Indoor

  • The Takagi T-K4-OS is a propane outdoor tankless water heater that provides hot water for your outdoor living areas.
  • The T-K4-OS can be installed outdoors with no need for venting thanks to the included thermal expansion valve which allows it to operate at lower pressures than most other models on the market.

This unit has an 8 gallon per minute maximum flow rate and is designed to produce 190,000 BTUs of heat. This model is excellently reliable with stainless steel venting pipes. It uses natural gas to offer you endless services. The computerized system has made it very safe to use. It comes with zero pilot light to save energy. Hence, it makes it an energy-efficient product.


The company has designed this unit for indoor installation. But some experts claim that the Takagi T-K3-N profile is brilliant that allows its conversion from indoor to outdoor. But at the same time, they recommend mounting this heater in a recess box to save it from environmental effects.

Temperature Control:

Either you install it indoors or outdoors, you can change the required temperature. There are 8 presets for the temperature of 104 Fahrenheit and 18 Fahrenheit as a minimum and maximum value. This preset is functional when you use a computerized system.

On the other hand, if you are getting remote control services to manage the temperature, you can set the water heater to any temperature limit. Its range is from 99 Fahrenheit to 176 Fahrenheit with the help of remote control.


It comes with next-level performance. Opposite to the other tankless water heater, Takagi T-K3-N works equally well in less quantity of fresh air. This capacity makes it versatile as compared to the other indoor type water heater. Moreover, this service is supplied by the sealed combustion and power-vented flue.

Amazingly, the gases that are exhausted as a result of working can expel at the height of 50 feet. This feature saves the population from harmful gases very effectively.

Flow Rate:

When talking about maximum flow rate, it comes to know that Takagi T-K3-N has a capacity of 6.6 gallons per minute. This level is enough to meet the demand for small to medium homes. If you need warm water more than this limit, you can take the services of an easy-link system any time you want.

This system is very active to join multiple similar connections with each other. This trick not only offers an enhanced flow rate but offer a good power. If you own a larger home, your living area is mostly covered by cold temperature, or you want to use it on a commercial level, this connection system would work well.

Talking about the minimum flow rate, you can enjoy 0.5 gallons per minute. If the water flow is low in your area, you would be served with warm water for sure. This feature is enabled due to the electronic circuit board, in addition to the gas modulating valve.


  • Multiple units can be connected in a row to get plenty of warm water with enhanced power
  • It comes with a remote control that allows you to choose any point of temperature
  • The size is small and compact; hence, it can be mounted in a narrow place
  • Emitted gases reach up to 50 feet to save the general population
  • It can work equally well in the absence of fresh air


  • The computerized system allows only 8 preset temperature to enjoy

Condensing Water Heaters

Takagi’s condensing water heater uses copper alloy and stainless steel as the primary constructional material for their heat exchangers. This composition very effectively bypasses the corrosion, followed by zero leakage chances.

Plus, the same construction is specialized to warm the water with the help of combustion gases to reduce energy usage. This advanced trick not only makes it an efficient unit but also reduces the operating cost.

Best Overall

Takagi T-H3-DV-N

4. Takagi T-H3-DV-N

Max GPM 6.6, 0.82 Energy Factor Rating, Natural Gas, Indoor

  • The Takagi T-K4-OS is a propane outdoor tankless water heater that provides hot water for your outdoor living areas.
  • This unit has an 8 gallon per minute maximum flow rate and is designed to produce 190,000 BTUs of heat.

The T-K4-OS can be installed outdoors with no need for venting thanks to the included thermal expansion valve which allows it to operate at lower pressures than most other models on the market. Takagi T-H3-DV-N is another indoor type water heater that is compatible to use for commercial or residential purposes. It produces a significantly lower amount of nitrogen oxide gas that makes it safe for the environment. The next-level copper alloy makes the whole composition of heat exchangers. You can use it for heavy applications in a house.

Amazingly, it can be used at a height of 10,100 feet. Based on the temperature of groundwater, the flow rate may be changed. In a warm season, it can entertain up to four supplies that are reduced to three in the cold season.


This condensing type water heater comes with a large variety of protective features. It detects the problem itself and fixes it accordingly. This trick makes it an excellent choice to ensure safety. In addition, the protection is enhanced with multiple protective functions that include overheating, freeze control, surge protection, and more.

The company claims that Takagi T-H3-DV-N is exceptionally safe to use as they used zero lead in its construction. This feature adds an extra layer of security.

Multiple Connections:

This tankless water heater happily offers multiple connections with different devices. With or without the presence of a multi-unit controller, it can offer you to entertain with three or more units at a time.

Flow Rate:

This unit enjoys a good flow rate of 10 gallons per minute. This capacity is sufficient to fulfill the need for a larger home. Alternatively, it can be used for commercial purposes. If you live in a cold environment, the same water heater will not let you run out of warm water. Its fast working works amazingly to offer warm water within seconds.

An electric water heater offers 2 to 4 gallons of water per minute that is too low as compared to this natural gas type heater.

Condensing System:

In contrast to the non-condensing type, this unit its combustion chamber allows steam condensation. As a result, the warm water is produced to be drained out of the chamber. If we compare it to the natural gas water heater, this system produces warm water efficiently. Moreover, this unique system produces no mess as it clean to use.

Its integrated burners and heat exchangers quickly arrange the hot water regardless of the incoming water temperature. This is the main trick that does not let you get short of warm water in any season.


Takagi T-H3-DV-N tankless water heater comes with an efficient and easy installation system. Furthermore, the style is a direct venting type that makes the installation very convenient. The manufacturer advises you to mount this model indoors to ensure safety.


This tankless water heater is very durable and reliable. It enjoys the energy star certification with a value of 0.95.


The maximum limit of water that can be attained with Takagi T-H3-DV-N is 18 Fahrenheit. This is the maximum temperature that Takagi offers. The temperature can be managed very quickly with the help of a remote. It shows error code in the presence of a problem in any internal process. Keep in mind the remote control does not come with this tankless water heater. You need to have purchased this remote separately.


  • With the warm water, there would be no hot gas in the supply
  • The flow rate is outstanding in supplying the warm water to large home
  • Installation is super easy and straightforward
  • This unit is amazingly durable due to its sturdy profile
  • It comes with shallow carbon footprints as compared to its competitors


  • The company does not take responsibility for its repairing

Best Overall

Takagi T-H3-DV-N

5. Takagi T-H3-DV-N

Max GPM 6.6 0.93 Energy Factor Rating Natural Gas, Outdoor

  • Takagi T-H3M-DV-N Condensing Direct Vent Tankless Water Heater, Natural Gas. Inlet, outlet thermistors for constant temperature monitoring.
  • Perfect for light residential and radiant heating applications. Manufactured in Japan.

Takagi T-H3M-DV-N is very efficient to entertain multiple connections at a time. In addition to efficiency, it comes with amazing power and a nicer warranty.


Takagi T-H3M-DV-N is offering you a flow rate of 10 gallons per minute. This capacity is higher than other outdoor or electrical-powered heaters. Their maximum flow rate is 8 GPM and 2 to 3 GPM, respectively.

This unit offers warm water very instantly as you need it. Coming towards the power, it needs minimum power of 199,000 BTUs to let it fully functional. No extra parts are required in order to install to use maximum service.

Their weight is 60 pounds that are too heavy to be lifted, so choose the most suitable place and mount it once.


This unit needs natural gas to heat the water. As the cold water is felt in the pipes, Takagi T-H3M-DV-N

Let its burner on in addition to heat exchangers. This process may release fumes into the surrounding. As it uses the condensing system, the steam has been condensed in the combustion chambers, followed by warm water draining.

When we compare Takagi T-H3M-DV-N to other similar products, it gets to know that this unit is clean to use and more efficient. The condensing system brings about its efficiency. This is a unique technology that other brands do not offer.

Heat Flow:

The maximum temperature offered by Takagi T-H3M-DV-N is 185 Fahrenheit. This limit is unique to provide intense warm water. If you live in a colder area, this model will give you enough warm water ignoring groundwater’s lower temperature.

If your surrounding temperature is somewhat moderate, then you can get the water accordingly.


The draining system has made the installation somewhat complicated. This fact prevents you from going for self-installation. The DIY installation would destroy the parts, followed by the destruction of the warranty. If you know its installation, you need ground wires, a hose, a valve kit, and a drain.

Additionally, if you live in a location that produces acidic water, we recommend getting an acid neutralizer kit to manage this kind of water. The remote control can be used to manage the temperature according to your demand.


  • Its power is perfect for serving residential and commercial demand.
  • No need for vents due to condensing system
  • The working is very clean and efficient


  • The weight is very high that makes it less portable

Frequently Asked Questions ( FAQs )

1. What Are the Other Famous Brands That Are Offering Tankless Water Heaters?

In addition to Takagi, other famous names are Rheem, Rinnai, EcoSmart, Noritz, Stiebel Eltron, Hike Crew, and multiple others.

2. Where Are Takagi Tankless Water Heaters Made?

Takagi is a company in Japan and offers tankless water heaters from the same country. The company provides residential heaters in addition to commercial products. They differ in flow rate and technology that make them unique.

3. Point Out the Disadvantages of Tankless Water Heaters?

Every device that provides vast advantages also offers some disadvantages. A tankless water heater has come up with the following disadvantages;

The installation process needs additional costs for the parts and professionals required to be hired.

The maximum flow rate may vary depending upon the location.

Their tag price may be higher as compared to the heaters.

This may reduce the working capacity in the temperature with extreme cold.


We have done fine research followed by Takagi tankless water heater reviews. According to our study, Takagi has stepped into the market with its two series. Both series bear the tankless water heater with nicer quality and optimum temperature availability.

Non-condensing Takagi tankless water heater comes at less price. Its size is smaller yet provides an excellent flow rate. It is equipped with multiple safety features to ensure protective functioning. It includes overheating, freeze protection, or more.

If we talk about condensing type, the technology gets changed. These can be used on an industrial scale in addition to residential use. You can pick this type, if needed, a durable product.

After reading this detailed review, we are confident that you would never be confused about its functioning and other basic information.

Our Recommendation

If you need plenty of water heaters to fulfill the need of a commercial level, Takagi T-K4-IN-NG is a good option for you. It can work both on natural gas or propane and safe to use. The price is not very high, so you do not need to panic.

If your budget allows and you need a tankless water heater with a reasonable flow rate, the Takagi T-H3-DV-N model would be a good option for you. The maximum flow rate is 10 gallons per minute and sufficient to demand a large home or an industry.

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