Indoor Takagi T-KJr2-IN-NG Tankless Water Heater, Natural Gas, 140K BTU

Indoor Takagi T-KJr2-IN-NG Tankless Water Heater, Natural Gas, 140K BTU

Indoor Takagi T-KJr2-IN-NG Tankless Water Heater, Natural Gas, 140K BTU QR Code
Product Code: T-KJr2-IN-NG

Availability: In Stock

Weight:38.00 lb

Dimensions (L x W x H ): 17.00 x 14.00 x 28.00

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Takagi T-KJr2-IN-NG Tankless Water Heater is the smallest water heater in the Takagi tankless line with gas inputs up to 140,000 BTU per hour and an energy factor of 0.81-0.83.


Includes TK-RE02 Remote Temperature Controller.


This cost-efficient and environmentally friendly Takagi Tankless Water Heater can support hydronic baseboard or radiant floor heating applications, as well as provide domestic hot water to plumbing fixtures and appliances. Takagi T-KJr2-IN-NG can meet all the hot-water needs of a small American home or apartment with one or two bathrooms.


At an average (rise in temperature) of 60F in warmer areas Takagi T-KJr2-IN-NG Tankless Water Heater will provide 228 GPH (3.8 GPM) and enough hot water for one shower and a lavatory basin at a time; or one low-flow shower (2.5 GPM or less) and an appliance, such as a dishwasher or washing machine, at the same time. In colder areas where the input temperature may be 40F or less you can expect a flow rate of about 174 GPH (2.9 GPM) and running only one major fixture at a time. Please refer to the flow charts for specific rates. The All new Takagi T-KJr2-IN-NG has a max GPM of 6.8GPM.


Takagi Tankless Water Heater T-KJr2-IN has four preset temperatures: 113F, 122F, 131F, 140F.  

To convert the water heater from a standard vent system to a direct‐vent (or sealed combustion) system, use a TK-TV10 Direct‐Vent Conversion Kit. By default , the unit will use the intake air from the room where it is installed.



Fully modulating, gas fired tankless water heater;

Indoor installation only(Direct-vent convertible);

Safety Features:

  • Air-Fuel Ratio (AFR) sensor;
  • Exhaust & Water Temperature Safety Control;
  • Overheat Cutoff Fuse

Internal Freeze-Protection System;

Manual reset high limit switch;

Horizontal or Vertical Installation;



Fuel Type: Natural Gas;

Max BTU Rating: 140,000 BTU/h;

Min BTU Rating: 19,500 BTU/h;

Max. Flow Rate: 6.8 GPM (Gallons Per Minute);

Min. Flow Rate: 0.75 GPM (Gallons Per Minute);

Water Pressure: 15 ‐ 150 psi (40 psi or above is recommended for maximum flow);

Energy Factor (Natural Gas): 0.81;

Capacity: 2 fixtures (at 60F or higher inlet water temp.) or 1 fixture (at 40F inlet water temp.);

Hot/Cold Water Connections: 3/4" NPT;

Gas Connection: 3/4" NPT;

Weight: 28.7 lbs;

Dimensions (inches): 20.5" high x 13.8" wide x 6.7" deep;

Electric Consumption: 120 VAC ; Standby: 0.05 A, Operation: 0.61 A, Freeze-Protection: 0.93 A;

Ignition: Electric Ignition;

Natural Gas Pressure Inlet: 5.0" W.C. min.; 10.5" W.C. max;

Manifold Presure (Natural Gas): 2.0" W.C.;

Temperature Settings (dipswitch settings without remote controller): 113F, 122F, 131F and 140F;

Temperature Range (with TK-RE02 Remote Control): 99 - 167F (122F Default factory Setting);

Venting Intake: 3" O.D. (ABS, PVC, Galvanized Steel, Corrugated Stainless Steel or Category III/IV Stainless Steel);

Flue/Exhaust: 4" O.D. (Category III Stainless Steel);

Vent: 50' Max Length, 5 elbows max;

Product Specs
Application:1-2 Showers
Depth (Inches):6.7"
Energy Factor:0.82
Energy Star Rated:Yes
Fuel Type:Natural Gas
Gas Connection:3/4"
Gas Input:19500-140000 BTU/h
Inlet Gas Pressure:5.0-10.5"W.C.
Installation Type:Indoor Only
Manifold Pressure:2.0-2.5"W.C.
Max Flow (GPM):6.6
Product Type:Tankless Heater
PSI Range:15-150 psi
Temperature Range (F):99°-167°F
Vent Size:4"
Venting Requirement:Category III Stainless Steel
Water Connection:3/4"
Weight (lbs):33 lbs
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