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Takagi T-KJr2-IN-NG Indoor Tankless Water Heater Review 2021

When it comes to a power-packed performance, the Takagi T-KJr2-IN-NG is always a reliable option. Not because it can duly satisfy the needs, but it has specific features that can make you go gaga over the product.

However, before you buy the product, you must know everything about it. From the features to the performance and even the difficulties that you may face- all are important.

So before you go on to purchase the Takagi T-KJr2-IN-NG, go through this entire Takagi Tankless Water Heater Review to know all about the product and what you can do with this.

Perfect for high altitude places

The Takagi T-KJr2-IN-NG works perfectly when you are living at a high altitude. This may even work great if you live in colder places. So if you have enough water pressure at the locality, it will always provide a good flow.

I have asked some of my known persons about the performance on the hills and it seemed to be very reliable. Needless to say, that the product has efficiently worked at an altitude of 7500 feet.

Remote control

Having such a feature can be great for any gas-based heaters. Most of the regular heaters do have an adjustable thermostat. But to change the settings of the heat temperature, you need to get up to the heater and then change it accordingly.

Luckily, the Takagi T-KJr2-IN-NG comes with remote control. So when I wanted to change the temperature settings, it was just about a few clicks away from the perfect settings. This feature saves a lot of time and effort.


When you use any tank based heater, it takes time to heat the entire water stored inside. Once it is completely done, the heater then flows out the water. But with the Takagi T-KJr2-IN-N, it is not the same.

Here, the heater runs the burner directly just after you turn it on. With a reliable and stable temperature, the product can perform much efficiently. It can cut on the costs to 1/3 times than that of any regular tank-based water heaters.


The Takagi T-KJr2-IN-NG includes a space-saving technology for the manufacturer. It is specifically designed to be more compact and accurate. Thus, there is enough space always available when you want to install the heater or to mount it.

The accurate dimensions of this Takagi Water Heater are around 6.7 x 13.8 x 20.3 inches. Comparing the other gas-based heaters, it seems to be much compact and reliable to use. So it just eats up the lowest space making the heater look impressive.

High capacity

Another impressive feature is the high capacity. The product is always reliable to use even if you have a large family or you have connected it to multiple faucets. The T-KJr2-IN-NG includes a flow rate of 6.6 GPM at 35 degrees Fahrenheit temperature rise.

However, even if you require a higher temperature up to 70 degrees, the heater still provides a 3.3 GPM flow. This means that this tankless water heater is quite reliable to use with 3 faucets at the same time. You will never run out of water. 

Good safety features

The one thing that I liked the most about this indoor tankless water heater is the safety features of the product. The manufacturer has always made it clear that the product will include a decent storage tank. It comes with Grade III stainless steel.

Apart from this, there are other safety features including the freeze, overheat, troubleshooting codes and also the surge protection. All these safety measurements are very necessary when you live in high altitudes or any contaminated locality.

The Takagi T-KJr2-IN-NG is a great product for residential purposes. Because of the safety features, it becomes long-lasting to work with. Thus, the manufacturer provides a limited warranty of 10 years on the heat exchanger. This is by far the highest amongst most of the gas-based heaters.

Apart from this, you can also get a warranty of 5 years for all the internal components of the water. However, you must keep in mind about using the water heater according to its guidelines. This is mainly because if the water is hard and full of contaminants, it will damage the internal components.

In such a case, the warranty will not be void. Keeping the heater in a safe place is a must if you want to get complete warranty satisfaction. If you wish to claim the warranty, you need to contact the manufacturer. You can do this easily by either contacting 1-877-737-2840 or you can visit the official website for more details.

Takagi T-KJr2-IN-NG Installation

When it comes to the installation, the T-KJr2-IN-NG is one of the simplest on the line. This is mainly because the product is small and it is light in weight. So it is always easier to handle the heater.

However, the manufacturer insists that the installation must be done with the help of a professional. This is mainly because the installation location is very important. You cannot place the heater in just a pit or an attic. Make sure that it is properly mounted.

Moreover, the Takagi provides an instruction guide along with the heater. This is fairly efficient for you to carefully go through the entire guide to avoid any type of damages.

If you already have a heater and you are done with the venting and electrical connections, you may have to change the process. The installation is easy but you must be careful to avoid damaging the product for warranty purposes.

Consumer Comments

Before buying any product, going through the consumer comments are very important. However, when I went down this section to research from all the forums, I found it to be very relaxing. The Takagi T-KJr2-IN-NG comes with favorable reviews for the most part.

In fact, most of the customers are satisfied with the product. Since it is light and compact, most of the users have already mentioned that it became easy to install. Apart from this, there are also comments on the performance. 

The Takagi T-KJr2-IN-NG performs extremely well and there are no signs of slowing down even if you use with multiple faucets. Coming to the cost of the product, most of the users have been satisfied. Although it seems to be higher upfront, when you consider a 20-year long run, it can be very economical to run. 

However, there is just a handful of comments from some users about the performance not being up to the mark after a few months of installation. There may be several factors about such comments as they have not specified the climatic conditions and the details of their installation. So I will recommend you to get it installed by a professional.


The Takagi T-KJr2-IN-NG maintains a key configuration that makes the product perform well under any climatic conditions. When I compared the model to the other gas-based heaters available, I found that the technology used can easily save up to 40% of the energy.

This is mainly because the energy factor of the water heater lies between 0.81-0.83. Apart from this, the heater can operate with 1 Watt consumption for producing 0.82 gallons of water. 

While going through more, I found that it has a decent flow of heat. Even at the higher or lower temperatures, it can provide around 6.6 GPM. However, when I used multiple faucets with the product, I found that it works at 3.3 GPM for three faucets. So it can always work efficiently in any situation.

Coming to the power consumption, it runs stable at 120 Volts and it has a gas burner. So it will never consume much electricity while operating. Also, this Natural Gas water heater is capable of heating 140,000 BTU which is an added advantage to the product.


If you are looking for a powerful heater that will have all the latest technology, the T-KJr2-IN-NG is the right choice for you. Though you may feel that it is slightly higher up on the costs while purchasing, it is still beneficial for you. The daily running costs are the lowest and it can provide you the run for a long time.

Moreover, the product has some unique features that make it easy to operate and to change. It gives a tough competition to most of the gas-based water heaters available in the market today. So considering the value, it always gets a five-star rating to purchase.

Company Information

Takagi is a pioneer when it comes to plumbing whole sellers and contractors. Over 60 years of operation worldwide, it has become one of the leaders in the industry. The company was established in 1952 keeping in mind the innovation to customer satisfaction.

So even if you need a hot water solution for any type of home or commercial requirements, you can always find it first from Takagi. Most of the haters that come from the manufacturer are around 95% energy efficient making the world a safer place to be.

When innovation comes to play, the company shares advanced technology like air-fuel ratio rod and other safety components in all the gas-based heaters.


  • 140,000 BTU
  • Energy factor of 0.81-0.83
  • 6.6 GPM max flow rate
  • Inlet, outlet thermistor for constant temperature monitoring
  • 4-Inch category III stainless steel


1. No Instant Hot Water

The Takagi T-KJr2-IN-NG does not provide any instant hot water with the product. In fact, it always takes up to 5-10 seconds to start the flow of hot water. This may be mainly because the pipe is frozen.


If you compare all the other water heaters, this problem is nothing new. It is not because the T-KJr2-IN-NG is slow. The natural flow of the heater is quite fast. The problem is mainly because there is water stored in the pipe and you are not using it for long.

So to get the hot water, the heater has to first throw out the water that is kept in the pipe and then start heating the freshwater. So you must wait for 10 seconds to allow the hot water pour out of the faucet.

2. The installation is a bit expensive

Takagi will void the warranty if there is any damage caused to the product while you are installing it. So paying for a professional from Takagi for installing the product will always be a bit expensive.


Hiring a professional for your job is always going to be expensive. So if you want to cut down the cists, you need to install the Takagi T-KJr2-IN-NG all by yourself. Keep in mind about the warranty and now you need to go through a detailed review of the installation guidelines provided.

If you are a bit confused, you can check some of your friends or family member’s home to know how the fittings are done. Research more about the uses of gas valves and how must they be turned on.

However, if you are not too confident about installing it, do not do it in a hurry and a random way. This is because improperly handling the product may cause accidents. This may even damage the product.

Once you are ready to install, keep in mind one thing that you need to remove any stored gas from the gas valve. This will reduce the chances of accidents.

Frequently Asked Questions [FAQs]

Q1. Is the Takagi T-KJr2-IN-NG Good for 5 People?

A1. Honestly, it is. But it also depends on the number of faucets that you require or the applications that you will be using with. I feel that it can be used with 3 appliances at the same time. So it should not be a problem.

Q2. What are the minimum requirements?

A2. What type of requirements do you want to know? It is electrical? You will only need 12 Volts to operate the Takagi T-KJr2-IN-NG. If it is about the water pressure, only 70 lb Psi will be enough. So it can be a great buy for higher altitudes.

Q3. Do I need to install a Vent?

A3. Before answering this, I would like to know if you want to keep your bathroom safe for use. If so, then installing a vent is a must. The Takagi T-KJr2-IN-NG can directly vent through the wall. But if the requirements are high, there will be emissions from the gas burner.

Q4. Can this System Handle Hard Water?

A4. I’ll be honest about this… hard water is never safe for any heater for a long time. Still, if you are considering the Takagi T-KJr2-IN-NG for a long time, it can be a decent choice. The product can work safely with hardness upto 7. But I will still advise you to get a water softener to get productive performance.

Bottom Line

If you live under extreme temperatures with cold nights, the Takagi T-KJr2-IN-NG can always be an impressive buy for you. Moreover, the product comes with a high capacity. So if you have a large family along with you it can always be a reliable buy.

Because of the high performance, I can suggest the Takagi T-KJr2-IN-NG be a good choice for the commercial uses. However, though you may face some minute challenges like installation, gas leakage, it is still a great product for you to choose from. You can always rely on the product.