[Ultimate Guide] Top 4 Best Takagi Tankless Water Heater Reviews

Tankless water heaters have numerous benefits. The price tag on most units may be intimidating to most people, but one thing you do not know is that they are worth every dollar spent. Buyers love tankless water heaters because they supply plenty of hot water without taking too much space.

Some of the best models available on the market come from Takagi. Their products use less energy and have high flow rates. Customers prefer the Takagi tankless water heaters because they are durable and flexible. They are also built with several safety features that help you operate and run them easily.

Takagi offers a great selection of tankless water heaters for residential use like the T-KJr and T-K4 models among other units. These Takagi tankless water heater reviews show you how the cutting-edge technology and advanced design of these units can save you both money and energy. If you are shopping for the best tankless water heater, then hopefully you will find this review quite informative.

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1. Takagi TM50NG Tankless Water Heater

  • Takagi T-M50NG Heavy-Duty Commercial Natural Gas Tankless Water Heater, 14.5-Gallon Per Minute

    Source: https://www.amazon.com

    A maximum flow rate of 14.5 gallons per minute

  • A maximum gas input of 380,000 BTU
  • Internal pump control port
  • Dual heat exchanger
  • Flame sensor
  • Electronic ignition
  • Built-in freeze protection

This new model is the most powerful tankless water heater. It is designed for heavy-duty commercial applications. The TM50NG has commercial-grade components and can be multi-linked to meet the high demands of your organization. The TM50NG tankless water heater has a maximum gas input of 380,000 BTU making it able to produce hot water for six bathrooms. It can supply hot water to domestic systems which can be used with storage tanks and hydronic heating systems.

Features like the built-in freeze protection, flame sensor, and electronic ignition make this model work every dollar spent. It has a noise level of 56 dB and also features an air-fuel ratio rod. You can either install it vertically or horizontally. We love the versatile nature of the TM50NG. Depending on your preference, you can either install it indoors or outdoors. Another thing we like about this unit is that if one system goes down, the other will continue running. When it comes to design, this new model truly boasts a sleek and modern design.


  • Resilient against erosion and leaks
  • You can connect up to 20 units
  • Safety features for peace of mind


  • A bit pricey

2. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas

  • Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas

    Source: https://www.amazon.com

    A maximum flow rate of 6.6 GPM

  • 140,000 BTU
  • .83 energy factor
  • Energy star
  • Safety features

The Takagi T-KJr2-IN-NG unit is one of our favorite tankless water heaters. Being a Takagi product, you can expect a lot from it, but one thing you don’t know about this unit is that it is the smallest unit in the Brand’s line-up. The unit has received a lot of 5 stars from many customers who praise it for being compact and having striking features. Despite this small size, the water heater supplies hot water in two bathrooms simultaneously. It is perfect for small apartments or light residential applications.

The Takagi T-KJr2-IN-NG has a pocket-friendly price tag making it ideal for those working on a tight budget. Most customers prefer this model because according to them this is the best water heater on the market. It scores the highest in the technology used and its ability to supply hot water for a small-sized family.

The Takagi T-KJr2-IN-NG unit guarantees consistent temperature through thermistors. There is an air-fuel ratio sensor designed to check efficiency. When it comes to heat output and flow, the unit delivers its best. The indoor unit functions on natural gas with a maximum input of 140,000 BTU/h. The flow rate is 6.6 gallons per minute at 350F.


  • Very affordable
  • Long-lasting
  • Easy installation
  • Built-in DIP switches make it easy to adjust its performance


  • Not ideal for larger homes

3. Takagi T-K4-OS-NG Tankless Outdoor Water Heater Natural Gas

  • Takagi T-K4-OS-NG Tankless Water Heater, Natural Gas, Outdoor

    Source: https://www.amazon.com

    A maximum flow rate of 8.0 gallons per minute

  • 190,000 BTU
  • Built-in freeze protection
  • Natural gas
  • Manual reset high-limit switches
  • Safety features
  • No venting required

We’ve included the T-K4-OS-NG unit on our Takagi tankless water heater reviews because it is one of the few best outdoor models to buy. It is perfect for those living in warmer regions because it works quickly with the already warm groundwater. Boasting a maximum BTU output of 190,000, the Takagi T-K4-OS-NG also works efficiently in cooler areas.

One great feature that makes it perfect for colder climates is the built-in freeze protection. This feature keeps the supply lines from freezing and ensures cold water does not come through the faucets. If you are worried about the temperature dropping, you should not because this unit also has built-in components that monitor the temperature constantly to ensure it does not drop. Unlike other models that require extra ventilation, this unit works just with the integrated ventilation system.

Regarding performance, the Takagi T-K4-OS-NG exceeds expectation, but then again, this depends on your requirements. If you are a small or medium-sized household, you can rely on this water heater for your hot water needs. This ultra-compact model can be mounted on a wall, but it requires only outdoor installation. The overall quality and the lifespan of this Takagi water heater is extraordinary. Even after years of use, this water heater will still work flawlessly. According to online customers, the T-K4-OS-NG is the quietest and safest unit to use.


  • Affordable
  • No need to hook up any vents
  • Quiet and safe
  • Reliable and efficient
  • Perfect for small households
  • Built-in components for temperature monitoring


  • Not ideal for larger homes

4. Takagi T-K4-IN-LP Indoor Tankless Water Heater, Propane

  • Takagi T-K4-IN-LP Indoor Tankless Water Heater, PropaneA maximum flow rate of 8.0 GPM
  • 190,000 BTU
  • Water temperature safety control
  • Energy factor of .82
  • Built-in venting system

Our 2019 Takagi tankless water heater reviews wouldn’t be complete without recommending this product. This new model boasts an impressive GPM of 8.0. It is cost-effective and has a gas input of 190,000 BTU. We recommend this tankless water heater to mid-size residential homes with 2-3 bathrooms. At 38 pounds and 13.8 inches wide, this compact model can be mounted on a wall.

The .82 energy efficiency rating makes it one of the most energy-efficient models on the market. And because it is energy star approved, you can rest assured your bills will be cut down by more than 40 percent. You do not have to use vent caps therefore installation is easy.

Backed by a 12-year heat exchanger warranty and a 5-year warranty on parts, you can rest easy knowing that this unit will push you through for many years. You’ll love the sleek and modern design of this white water heater. The compact design means that you can put it anywhere without using too much space. If you are working on a tight budget, then you’ll appreciate this model because it sells below $1000.


  • Very affordable
  • Efficient and environment-friendly
  • Ultra-compact design makes it easy to mount on a wall
  • Safety features like surge protection for peace of mind


  • Not suitable for larger households

Wrapping up Takagi Tankless Water Heater

Our choice today is the T-KJr2-IN-NG model which is the smallest and most efficient unit designed for indoor use. We prefer this model for our customers because it is quite affordable and delivers the same if not better performance as other high-end models. The top features of this unit include the built-in DIP switches and additional safety features for peace of mind.

Because we gave it the highest score in the technology used, you can rest assured that you are buying the best model on the market that delivers exceptional results. While it may not be ideal for larger families, households with light applications will benefit the most from this tankless water heater. We are yet to find a model that matches this unit but so far, nothing beater the Takagi T-KJr-IN-NG on the market.

As we wrap up our review, we hope that you now have the right information to get the best model on the market. Takagi’s products have been on the market for long and served thousands of customers so you will be purchasing a product the delivers exceptional results.

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