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

Takagi T-KJr2-IN-NG model is the smallest unit in the Takagi line-up. It has outdoor and indoor models. Both are using natural gas and propane gas for heating. T-KJr2 uses for indoor installation and has an option to use direct vent systems. It can fit well in small areas. This model is suitable for light residential and radiant heating applications. It is one of the best water heaters on the market. T-KJr2 is perfect for those who are on a budget to get a quality water heater. It is among the best indoor natural gas tankless water heater.

Takagi Natural Gas

Features of Takagi T-KJr2-IN-NG:

  • Easy Installation:

T-KJr2-IN-NG comes with instruction. It can help you to know how to get everything put into place. You can also get a ton of reviews that give you step by step instructions. So it will make the install process lot easier. It comes with the flexible installation option. You can install it both horizontal and vertical option. This can make the product budget friendly as you need not bring someone else for the installation.

  • Compact size:

A tank water heater eats away much space. Takagi T-KJr2 water heater has a compact design with the size of 20*14*8 inches. It weighs only 33lb. This is as big as an over-sized I pad.  So this size is ideal for installation in any part of the home. You can install it even in small bathrooms.

  • Cost Saving:

Takagi T-KJr2-IN-Ng runs only heat the burner when it feels a flow. So when you are on vacation or not using the heater, you won’t charge anything. It helps to drop the natural gas bill at least 1/3rd less at 131-degree temperature. So it is a cost saving unit indeed.

  • High Capacity:

Takagi can provide the largest flow rate of 6.6 GPM. In this capacity, you will never run out of water between 3 simultaneous applications. So it is an ideal choice for any climate.

  • Safety Features:

Takagi is a product of Japan. This unit comes with so many safety features. They do detail work, so the venting system. Takagi best gas water heater is made of category iii stainless steel. Many brands provide plastic vents or soft copper vents. The T-KJr2-IN-Ng unit features freeze, overheat, surge protection and troubleshooting diagnostic codes. Safety feature ensures no gas leaks.

  • Remote Control:

It is a plus point feature of this unit. Takagi natural gas water heater comes with both remote control and power cord. So you can control the heat from a distant. It helps to save much of your time and energy.

The Speciality of Takagi Best Natural Gas Tankless Water Heater:

  • 140,000 BTU
  • Cost Efficient
  • 6.6 GPM max flow rate
  • Need 4-inch category stainless steel venting
  • Inlet, outlet thermistors for constant temperature monitoring
  • Energy factor of 0.81-0.83
  • Easy Installation


  • Takagi is viable for residential uses with 140,000 BTU gas inputs
  • One of the best indoor tankless water heater of heating capacity
  • It uses natural gas which is energy efficient
  • Perfect for average size homes
  • Takagi best gas hot water heater is lightweight
  • Comes with 15-years of great warranty
  • Safety features ensure no gas leaks occur


  • Takagi takes5-10 second to supply hot water. So you may not get instant hot water.

Solution: For any tankless water heater it is a common thing.  Before turning the shower, you can wait for 10 seconds. Then turn back on the water valve down to the warm water mixture.

  • Warranty is not applicable if you install the water heater yourself.

Solution: Natural gas appliances can cause fatal accidents. So if you are afraid to do it yourself, you can hire a professional one. This can be more helpful to you.

Takagi T-KJr2-IN-NG Specification:

  • Brand Name: Takagi
  • Part Number: T-KJr2-IN-NG
  • Model Number: T-KJr2-IN-NG
  • Product Dimension: 6.7*13.8*20.3 inches
  • Product Type: Tankless Water Heater
  • Power Source: Gas
  • Fuel Type: Natural Gas
  • Item Weight: 38 pounds
  • Max Flow Rate: 6.6 GPM
  • Installation Type: Indoor
  • Vent Size: 4 inches
  • Gas Input: 19500-140000 BTU/h
  • Water Connection: ¾ inches
  • Gas Connection: ¾ inches
  • Certification: Energy Star
  • Temperature range: 99 to 167 degree F
  • Country of Manufacture: Japan
  • Warranty: 10-year heat exchanger and 5-year parts


Question: 1 is this natural gas tankless water heater concentric vent piping?

Answer: No, The Takagi TKJr2 takes 4 inches single wall stainless steel venting to the outside.

Question: 2 What GPM do I need for a single family?

Answer: It depends on how many fixtures you would use at one time. The t-kjr2-in-ng unit is good for 2 applications at a time.

Question: 3 Is this a Japanese Product?

Answer: Yes, You are correct. This gas hot water heater is a Japanese Product.

Question: 4 Does this unit has a pressure check valve and backflow preventer?

Answer: No, It does not.

Question: 5 what are the venting equipment for this Takagi TKJr2?

Answer: It needs a 4-inch double walled pipe.


The tankless water heater can support many home appliances at a time. This particular unit from Takagi is a creative manufacturer from Japan. They promise to deliver a flawless performance for at least 10 years. It is one of the best gas water heater brands. Some good features like 6.6 GPM, remote control, energy efficiency can make your choice easier on buying this unit. It has a few difficult challenges. But these risks are unavoidable no matter which one you choose.  So if you are looking for a long-lasting and low budget water heater, then Takagi is a good option. For the price and easy installation, this unit can be a fantastic deal for you. The best gas water heater brand review can be helpful for you.

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