Top 6 Best Takagi Tankless Water Heater in 2022 (Review + Buying Guide)

Best Takagi Tankless Water Heater Reviews

Last Updated on February 25, 2022

Takagi tankless water heaters are one of the most trusted brands in the market to get instant hot water. It is made up of an energy saving heating element which cuts down on your electricity bills.

And if not for winter days, you might like to have a warm shower after a hectic day at work. But who has time to wait for the water to heat up when you have some best tankless water heaters out there? Right!

Tankless water heaters are known for their excellent performance. They heat up water quickly as well as occupy less space in the bathroom. So ditch your old tank heater with tankless one and experience the difference.

You might be wondering, why we’re solely focusing on Takagi water heaters brand? The reason behind including Takagi heaters is because of their high water flow rates. No doubt, other brands will perform equally when you install and use them on lower altitudes. But many of them fail to provide the same efficiency on higher altitude. But this is not the case with Takagi brand.

It does not matter if you live at a low or high altitude place, you will experience high performance all the time. Besides, Takagi water heaters are known for their super flow rate. So now its time to replace your old unit with a new Takagi unit. And below are some of their best products.

ModelFlow RateMax. BTUPrice
Takagi T-KJr2-IN-NG6.6 GPM140,000 BTU
Takagi T-KJr2-IN-LP6.6 GPM140,000 BTU
Takagi T-KJr2-OS-NG6.6 GPM140,000 BTU
Takagi T-H3-DV-N10.0 GPM200,000 BTU
Takagi T-K4-IN-LP8.0 GPM190,000 BTU
Takagi T-K4-OS-NG8.0 GPM190,000 BTU

1. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater – Overall Best

Read Customer Reviews Here »

Robust design and performance of Takagi T-KJr2-IN-NG are perfect for households with up to 4-6 members. With 140000 BTU’s and 6.6 GPM max flow rate, it works brilliantly for 3 bathrooms. The temperature remains consistent even if all 3 bathrooms are in use. Isn’t it a great deal? You can all take advantage of instant hot water without any temperature fluctuations.

Thanks to its inlet/outlet thermistors that constantly monitor temperatures. Whereas, the sensors generate an energy factor of up to 0.83 which is better as compared with tank models. Plus, it operates using natural gas. So Takagi saves money by cutting your electricity usage while at the same time provides a consistent flow of hot water.

Are you buying an indoor tankless water heater for the first time and worried about overheating? Then leave all worries to Takagi T-KJr2-IN-NG as it comprises of a built-in surge protector. This protector turns off the water heater in case it overheats. Thus, prevents fire hazards as well as protects internal parts from burning.

In spite of being compact, Takagi T-KJr2-IN-NG allows you to set temperature from 99 degrees F to 167 degrees F. And interestingly, it comes with remote control through which you can monitor or change settings. Therefore, you do not need to travel all way down to the basement just to change temperature.

Why We Like it
  • Use of natural gas saves electricity
  • The compact design of this no-tank unit will not need much installation space
  • Though it uses natural gas by default, you can convert it into a direct-vent unit
  • Energy factor in between 0.81-0.83
  • You get a 10-year warranty on the heat exchanger and 5-year on parts
  • Flow rate of water heater is sufficient for households for up to 4-6 persons

2. Takagi T-KJr2-IN-LP – Best Smallest Tankless Water Heater

Read Customer Reviews Here »

The practical design of Takagi T-KJr2-IN-LP easily fits in small areas. Unlike, tank models that require huge storage area, this will occupy only about 1/3rd of space. So not to worry if you have less installation space as it is not an issue with this model. But wait, it has a lot more to offer than compact size.

The copper heat exchanger is capable of heating water up to 167 degrees Fahrenheit. Therefore, making it the best indoor tankless water heater for both residential and commercial use. And the best part is, Takagi comes with an exterior remote control. This allows you to change the water temperature by the simple push of a button. Thus, which is both easy and safe.

Do not let this Takagi small tankless water heater confuse you with its performance. It features maximum 140000 BTU and minimum 19500 BTU. These efficiently provide a maximum flow rate of up to 6.6 GPM. And such flow allows the use of 3 bathrooms at the same time without any temperature fluctuations.

In order to prevent overheating hazards, Takagi T-KJr2-IN-LP comprises of a surge protector. In addition, other safety features include freeze, surge, and troubleshooting diagnostic codes.

The only downside of the product is it takes quite a while for installation as it a propane tankless water heater. But once you install the unit, you’ll keep getting hot water for years without much trouble.

Why We Like it
  • It is the smallest Takagi indoor water heater
  • Sensors help in maintaining even temperature of the water
  • A remote wall pad allows the user to change temperature easily with a push of a button
  • Energy factor in between 0.81 to 0.83 saves a lot of liquid propane
  • Built-up of the unit is such that it prevents elements from freeze damage
  • Price of the device is not too high nor too low
  • Supports direct venting in case you have very small installation space

3. Takagi T-KJr2-OS-NG – Excellent Outdoor Natural Gas Tankless Water Heater

Read Customer Reviews Here »

Venting is an important part of operating tankless water heater installation. Without proper venting, your unit could either get easily damaged or it will not perform up to the mark. However, small households do not have a large indoor space to install many units. So for them, Takagi T-KJr2-OS-NG is the best outdoor tankless water heater.

From the name itself you can say that it is meant for outside installation. Also, there are several advantages of mounting water heater outdoors. Say, for example, it cuts down venting and piping cost. Without making any modifications to your home, you can easily install an outdoor tankless water heater.

But it is important to take note of freezing temperatures outdoors as it affects heating capacity. Thanks to Takagi’s internal freeze protection that prevents damage from extremely low temperatures. Therefore, you can enjoy a hot shower inside while it is snowing outside.

Connections are pretty simple as it uses natural gas. And in spite of being an outdoor unit, it provides 6.6 GPM of maximum flow rate. Thus, you can expect it to work flawlessly in a small home having 2 baths and a kitchen. And for that, you just need to match your GPH with this particular unit.

Why We Like it
  • Best for outdoor use with natural gas
  • Features internal freeze protection to prevent damage during extremely low temperatures outside
  • 6.60 flow rate is sufficient for small homes and apartments
  • No need to worry about venting as it is an outdoor device
  • Remote control lets you switch the machine on/off and change degrees
  • Backed by 12 years warranty on the heat exchanger and 5 years on parts

4. Takagi T-H3-DV-N Condensing High-Efficiency Heater – Best On-Demand Instant Hot Water

Read Customer Reviews Here »

If you live in high altitudes with temperature readings in minus then you definitely need a robust unit. And Takagi T-H3-DV-N is just perfect for such low-temperature areas. Thanks to its high-quality construction and premium quality inside parts. It can outperform in altitude up to 10000 meters from sea level as well as withstands chilly winds.

With 10 gallons per minute of flow rate, this indoor natural gas tankless water heater is best for households with up to 5 members. You can use 3 shower head, a kitchen faucet, and a washing machine at the same time. Thus, which is by far the highest flow rate. Even after using bathrooms and washing machine at the same time, the temperature remains consistent.

Takagi T-H3-DV-N is energy-star certified which means it will consume less power. Hence, cutting down your gas bill. Speaking of natural gas, its heat exchanger and internal burners come in action as soon as they receive cold water. And you do not have to wait too long to get your work done.

Unlike other units, this Takagi energy star tankless water heater features condensing port. This port capture and disposes of water that gets condensed during heating. As a result, it maintains the efficiency of the device for a long period of time.

Why We Like it
  • Flow rate of 10 gallons per minute is ideal for large households
  • It maintains consistent temperature even if you use dishwasher, showers, and kitchen faucet at the same time
  • Best for cold, high altitude regions
  • Ultra-low NOx emissions and lead-free built up makes it ideal to install indoors
  • Safety features include freeze and overheat protection along with troubleshooting diagnostic codes
  • Easy to install with a quick-link feature that allows settings for up to 4 units

5. Takagi T-K4-IN-LP Propane Tankless Water Heater

Read Customer Reviews Here »

Takagi T-K4-IN-LP is a solution for people who need a great flow rate to carry out different household activities. This liquid propane offers an excellent flow rate of 8.0 GPM. Therefore, which is perfect for mid-size apartments or homes with 2-3 bathrooms. With such capacity, you can use a washing machine, dishwasher, and bathroom at the same time.

It offers 190000 maximum BTU’s and 11000 minimum BTU. Besides that, sensors help to maintain consistent temperature as well as minimizes heat loss. They generate energy factor up to 0.82 that effectively cuts down running cost. Thus, you will enjoy a long shower time without getting long usage bill.

Just like the majority of units on our tankless water heater reviews, this Takagi device also offers a wide temperature range from 99-167 degrees F. While lower temperatures are ideal for residential use, higher temp suits commercial use. No matter where you install it just make sure it is indoors for optimal performance.

Why We Like it
  • Installing this Takagi unit is quite easy as compared with others
  • 8.0 GPM of flow rate is best for midsize apartments and homes
  • Supports direct-vent conversion
  • Use of propane as fuel makes them less expensive than natural gas
  • Backed by a 12-year warranty on heat exchanger, 5 years on the part and 1 year on labor
  • It does not make much sound while in use

6. Takagi T-K4-OS-NG Gas-Powered Tankless Water Heater

Read Customer Reviews Here »

struggling with limited space of the basement? Or cannot find an appropriate place to install tankless water heater indoors? Then it is better to go for outdoor units rather than spending extra bucks on modification of home. Takagi T-K4-OS-NG is an excellent natural gas hot water heater that you can install outside of your bathroom/house walls.

So are you worried that freezing cold temperatures might damage your unit if installed outdoors? Then leave all your worries to Takagi T-K4-OS-NG as it comprises of in-built freeze protection. This will prevent damage to internal parts even if the temperature outside reaches zero or minus.

Credit goes to its inlet, outlet thermistors that constantly monitor the temperature. And apart from preventing the damage they also account for the product’s efficiency. And by that we mean, it maintains the consistent temperature no matter if you’re using a single kitchen faucet or 3 showers at the same time.

It does not require venting as it is an outdoor tankless water heater. However, it does produce a regular machine noise while heating water. But not to worry about noise as after the device is to be installed outside the home or apartment. For the price, it is one of the best outdoor water heaters worth money.

Why We Like it
  • Saves money as it does not need venting
  • Apart from maintaining a consistent temperature, it offers a great flow rate of 8.0 GPM
  • Built-in freeze protection prevents your unit from freezing damage
  • The device features 190000 maximum BTU’s
  • The energy-star certified product saves on the gas bill
  • Comes with a remote thermostat that allows you to change temperature settings
  • Offers a 5-year warranty on heat exchanger, 3-year on parts and 1-year on labor

Also Read: Best Electric Tankless Water Heater in 2022


Takagi is known for its excellent water flow rates even in higher altitude where many devices fail. Plus, they provide long warranty on their products which tells us about their sturdy construction and performance. Most of their units are compact so that you can fit them well in small areas.

Also, the majority of Takagi tankless water heater are energy-star certified. This helps to save bucks while the device is in use. Not only are they great on saving money but are safe for use. They feature overheating protection, built-in freeze protection and many other things to prevent hazardous accidents. In addition, they do not release any harmful component in the air which is great for both human health and the environment. is reader-supported and a part of the Amazon Affiliates Program. When you buy through links on our site, we may earn an affiliate commission. Read our disclosure for more information.

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