Over the years, water heaters and their associated technologies have evolved substantially. In the past, all water heaters were bulky and enormously heavy. Today, they’ve been slimmed down and compacted. A few companies have led the way towards innovation and Takagi would definitely fit into this category. The company has been providing consumers with water heating solutions for more than sixty years. Products manufactured by Takagi are sold exclusively by the world’s top contractors and plumbing wholesalers.

The company strives to provide consumers with a long-last, energy-efficient solution. By all accounts, they almost always manage to fulfill these goals. Below, you will learn more about Takagi and the top Takagi tankless water heaters.

About The Company

As mentioned above, Takagi has been in the game for over 60 years. The company originated in 1952. Takagi has offices in numerous states in America, including New Jersey, California and Tennessee. The company’s global office can be found in the country of Canada. Takagi hot water heaters are available throughout the United States, as well as many other countries. While the company strives to provide consumers with cost effective solutions to their water heating problems, they also want to make the world a safer place for everyone. They do this by making the eco-friendliest products humanely possible.

Takagi company logo

During the past 60 years, the company has been at the forefront of the industry time and again. They were the first to include an air-fuel ratio rod, which has proven to be an excellent safety mechanism. Takagi was also the first company solely dedicated to tankless water heaters to dive into the North American market. Today, they’re enormously popular among consumers and professional plumbers alike.

Endless Hot Water

One of the best features associated with Takagi water heaters is the fact that they can provide the consumer and their family with an endless quantity of hot water. As long as the unit is sized properly for the home’s precise needs, the residents of the home will never run out of hot water. Takagi offers an extensive lineup of water heaters. They’re available in a wide variety of sizes and this makes it possible for everyone to find a specific unique that suits their precise needs and requirements.

Very Compact

Takagi also strives to provide consumers with compact water heaters. When compared to conventional units, the offerings from Takagi tend to be much smaller. There is no tank or boiler and this helps the consumer save space within their home. And of course, the mass majority of tankless water heaters from Takagi are also wall mountable. This ensures the water heater will always remain out of the way. The wall mountable design makes it possible for the homeowner to install the water heater almost anywhere. Depending on the circumstances, it may be possible to install the unit in the attic or in a bathroom closet.

Exclusive Heat Exchanger HRS35

Takagi tankless water heaters are enormously unique thanks to their highly innovative heat exchangers. The company installs commercial-grade heat exchangers into each and every one of their tankless heaters. This will make a world of difference. The heat exchanger is designed to provide the user with maximum durability and extreme reliability. The HRS35 copper alloy is heat-resistant. Also, this component is made with additive elements, which help to improve its strength and hardness. Even when exposed to excessively hot temperatures, the HRS35 will maintain maximum strength, while also resisting erosion.

This small component greatly prolongs the lifespan of Takagi water heaters. These units will generally last much longer than their conventional counterparts, as well as many other tankless models.

Safety Galore

Takagi puts a great deal of emphasis on the safety and reliability of their products. The company has implemented a handful of technologies into their water heaters to increase their safeness. For starters, these units are equipped with a unique Air-Fuel Ratio Sensor. This sensor is capable of monitoring and controlling combustion. The sensor works in conjunction with the unit’s onboard computer to adjust the fan motor’s speed accordingly. In return, this optimizes air and fuel ratio to decrease emissions and maximize efficiency.

At the same time, the water heaters manufactured by Takagi are equipped with a handful of other safety features. They include freeze protection mechanisms, an overheat cutoff fuse, and a hi-limit switch. Many of the company’s tankless heaters are protected against internal freezing, even when utilized in sub-freezing conditions. The Hi-Limit Switch guarantees that the water temperatures never reach unsafe levels.

Improved Water Flow

Finally, it is important to remember that condensation can prove to be problematic for any heat exchanger. As condensation builds up, the risk of damage and leaks is increased substantially. The good news is that Takagi has taken steps to prevent these problems from happening. The company’s heavy-duty commercial units are equipped with condensation minimizing features, which help to protect against these damages. This includes an improved water pathway design and a widened pitch for the heat exchanger’s fins. In the end, these features will help to ensure your Takagi tankless water heater serves you and your family for many years to come.

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

Many homeowners are doing away with their conventional water heaters, because they are not energy efficient. Of course, this is not the only reason, but one thing is for sure, tankless water heaters are compact, requiring little installation space. In fact, you can mount them on a wall in a small closet or cubbyhole, within a matter of minutes. The Takagi T-H3-DV-N is one of the most popular tankless water heaters on the market, plus it does not utilize a dangerous pilot light.

Takagi T-H3-DV-N

Environmental Friendly Operation

The Takagi has been put throughout rigorous safety testing. Results show the unit only produces a low amount of mono-nitrogen oxides (NOx). This creates an environmental friendly operation, which is crucial in today’s society. Since there is no pilot light to worry about, you will never need to worry about house fires or relighting the pilot light. This is a condensing tankless water heater, which means it is capable of creating water from the burning natural gas, making the unit even more environmental friendly.

Digital Display

Takagi’s interface is very self-explanatory, as well as the digital display. Each button embedded into the display is labeled for better understanding. A digital display is more efficient than manual settings, plus the temperature will be displayed in large digits on the front of the panel.

Suitable For Homes With 4 Bathrooms

A home, with 4 bathrooms is definitely difficult to manage, especially if 4 family members are taking a shower at the same time. The traditional water heater would be lucky to handle one shower let alone a total of four. In order to have an abundance of water for this size home, you would probably need four 40 to 50-gallon traditional water tanks, which would take up an immense amount of space.

Well, with the Takagi, you only need the one unit. The T-H3-DV-N is capable of producing continuous hot water sufficient for 4 bathrooms in warmer climates and 3 in colder climates.


  • Wall mountable installation
  • Temperature settings from 100 up to 185 degrees Celsius
  • Flow rate – 10 GOM
  • Operational noise level – 55dB
  • Energy efficient model
  • Includes a 15-years on heat exchanger, 5-years on parts and 1-year on labor
  • Manufactured in Japan


  • Slightly heavy for a wall mount unit (85 pounds)
  • Takes about 2 to 4 seconds for hot water return

Overall Assessment

The Takagi T-H3-DV-N Tankless Water Heater is a high-quality unit that will provide you with an extended service life. To get the maximum service life and benefits from the unit, a professional installation is recommended. This is a medium-sized water heater, so it is slightly larger than compact models.

Takagi T-K4-IN-NG Indoor Tankless Water Heater

Thinking about tossing that traditional water heater in the waste bin? If so, you will want to replace it with an innovative Takagi T-K4-IN-NG. This unit is designed to offer energy efficiency and continuous hot water, without breaking the bank. It is capable of producing up to 190,000 British thermal units of power, which is quite astonishing for such a compact unit. This unit is designed for an indoor installation, so be sure to keep this in mind during the installation process.

Takagi T-K4-IN-NG Indoor Tankless Water Heater

Energy Efficient Design

Unlike the traditional natural gas water unit, which burns gas even when hot water is needed, the Takagi T-K4-IN-NG does not. This feature alone will reduce the amount of natural gas you use on a daily basis. After the first month of use, you will notice a significant alteration in your energy bill. The water heater features an energy factor of 0.82, which says enough about its ability to keep your energy bill to a minimum.

Home Size

Do not be fooled by the compact size of the Takagi, because it is still capable of producing enough water for a home with 2 bathrooms is cold climates and 3 bathrooms in warm climates. The only weighs 43 pounds, so it will not require any additional support, when mounting on the wall. The compact size is great for small apartments, flats and condos, measuring in at 20-1/2” H X 13.8” W X 8-1/2” D.


  • Compact and lightweight (43 pounds) design
  • Temperature settings – 99-167 degrees Fahrenheit
  • Capable of producing 8 gallons of hot water every minute
  • Energy efficient rating
  • Includes a 12-year manufacturer’s warranty on heat exchanger
  • Comes with a remote control


  • Requires a technician installation to receive the warranty

Overall Assessment

The Takagi T-K4-IN-NG Tankless Water Heater must be installed indoors, but with its compact, lightweight design storage should not be an issue. If you are looking for an affordable unit, be sure to keep this model in mind, because it is half the price of a competitor brand.

Takagi T-KJR2-IN-NG Indoor Tankless Water Heater

Takagi is well known for producing a wide variety of unique tankless water heaters. While many of the company’s products are very reliable, a few manage to stand out among the crowd. The Takagi T-KJR2-IN-NG Tankless Water Heater most certainly falls into this category. This product is fairly inexpensive, yet it will deliver a great performance and should be able to accommodate the mass majority of consumers and their family. The unit operates with natural gas and will maintain an energy factor of .81 to .83 during operation.


Takagi T-KJr2-IN-NG


When attempting to determine whether or not this unit is right for you, it is essential to look at the water heater’s rating. This water heater is capable of producing a maximum of 140,000 BTUs. And, it can deliver a max flow rate of 6.6 gallons per minute. While it depends solely on the setup of your home and the number of people living there, it is highly likely that the Takagi T-KJR2-IN-NG Water Heater will be able to accommodate your entire family. It is big, bold and capable of pumping out a substantial amount of hot water in a short period of time.

Lightweight And Compact

Another excellent feature of this Takagi water heater is its size. In total, the unit measures in at 6.7 by 13.8 by 20.3 inches. It weighs right around 38 pounds. The combination ensures this water heater can be installed almost anywhere. The water heater is slightly heavy, so it might be essential to get a helping hand for the installation process. Just remember that this is an indoor unit and 4-inch stainless steel venting is required. Nonetheless, the installation process should be fairly simple.

Extensive Warranty

One of the best features of the Takagi T-KJR2-IN-NG Water Heater is the extensive warranty. When the unit is utilized in a residential setting, the consumer will be provided with a 10-year warranty on the heater exchanger and a 5-year warranty on all parts. However, the warranties are only valid when the unit is installed by a licensed professional. The warranties greatly enhance the overall value of the water heater, while also ensuring maximum longevity.


  • 10-year warranty on heat exchanger
  • 5-year warranty on parts
  • Weighs just 38 pounds
  • Energy Star certified
  • A maximum of 140,000 BTU
  • Maximum flow rate of 6.6 GPM
  • Energy Factor ranges from .81 to .83


  • 4-inch stainless steel venting is required

Overall Assessment

At the end of the day, the Takagi T-KJR2-IN-NG Indoor Tankless Water Heater will prove to be a great investment for many consumers. It is lightweight, compact and very powerful. The unit is truly suitable for a wide variety of residential structures and should be sufficient for most consumers. For the price, it is definitely a great investment.