Takagi T Kjr2 IN NG Review


ENERGY STAR® qualified Takagi T-KJr2-IN-NG is a gas fired, compact, fully modulating, tankless water heater that is ideal for residential usage. The unit can easily produce sufficient hot water for two bathrooms with its gas input of 140,000BTU. The unit has less than 14 ng/J (<20ppm), which means it fully complies with Ultra-Low NOx regulations. T-KJr2-IN-NG is a multi-purpose heater that can be used with hydronic heating systems, storage tanks, radiant floor systems, recirculation systems and indoor heating applications for residences. The number of showers that the heater can handle relies upon ground water temperature. With just 0.82 natural gas energy factor and tendency of giving out a flow rate of 6.6GPM when temperature rises to 35degree F, this heater turns out to be the perfect option. It also comes with a remote control, built-in safety features like freeze/overheat/surge protection and troubleshooting diagnostics to avoid gas leakage, and a power cord.

The Pros & Cons of the Takagi T-KJr2-IN-NG


  • The unit turns off itself when overheating
  • To counter colder temperatures, the unit is equipped with a frost guard
  • High flow rates can be acquired by larger connections
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    Heater size is just 38pounds, which makes it ideal for indoor usage and installation
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    Since it is gas powered electricity consumption is not an issue and energy bills remain low


  • Heater can supply limited amount of hot water if used for two bathrooms
  • Installation is complex, expensive and tricky
  • Safety issues may arise if installation hasn’t been done properly
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    Limited warranty applicable only if a professional installs the unit
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    Some units create an annoying vibrating noise

Installation and Specifications

The unit already contains a remote control and a comprehensive step-by-step guide for installation. You will have to run a category III vent pipe and single wall or PVC won’t work. The unit requires a 3/4inch gas fitting and you need to ensure that the gas supply is sufficient enough to feed the unit. The heater has a power vent, which automatically adjusts gas consumption as per the demand and makes expanded horizontal venting possible. You will need to install a black glow preventer into the vent pipe if you reside at an area where temperatures can drop below 20degrees F. Since the unit requires double wall stainless steel exhaust vent, the cost may get higher.


Assembled Depth6.7"
Assembled Height20.5"
Assembled Width13.8"
Product Depth6.7"
Product Height20.5"
Product Width13.8"
Vent diameter3"
Water Connection Size3/4"
Finish FamilyWhite
Flow Rate @ 35 F Rise (gallons/min)3.4 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)4.2 gal
Fuel TypeNatural Gas/Propane
Gas Connection Size3/4"
Gas Product TypePoint of Use
Gas TypeNatural Gas
Maximum Temperature (F)140
Minimum Activation Rate (psi)15
Minimum Temperature (F)77
Pilot LightNo
Product Weight (lb.)33 lb
Residential/Commercial/industrial UseResidential or commercial
Total BTU140000
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Vent TypeSingle Wall

Common Problems

You need to be very careful while installing the unit because a minor flaw or mistake such as a lose connection can cause serious damage due to gas leakage. It is the smallest available gas tankless heater model and is more appropriate for small homes such as for a family of five. If you can afford the high installation cost due to involvement of a professional then go for this eco-friendly, compact and efficient water heating solution.


This is a good choice of a tankless water heater to buy as installation is quite easy and it has received great reviews as being a heater that can support the needs of a family of five as opposed to other tankless water heaters that do not perform so well if the hot water needs are high. As for being environmentally friendly, the heater complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm).

You can buy the Takagi-T-KJr2-IN-NG on Amazon.

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