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T-KJr2-IN Takagi Tankless Indoor Water Heater (Natural Gas)
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T-KJR2-IN-NG has been discontinued
Discontinued July 15, 2019
This product was discontinued by the manufacturer.
MANUALS (4)
This item replaces: T-KJR-NG
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Suggested Alternative:
Series 200 Ultra Low-NOx Non-Condensing Indoor Tankless Water Heater (6.6 GPM, NG/LP)
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Product Highlights
–
Natural Gas
6.6 MAX GPM
Indoor Only
99°F - 167°F
20.3"
6.7", 7-3/4" Depth
Description
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The Takagi brand has been discontinued by the manufacturer as of December 31, 2025. Suggested replacement units will be available on our website and replacement parts will continue to be available as supplies last. If you'd like any further assistance, please contact our customer service team.
Think Green, Save Green. Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency standards. Most states are offering rebates in the $50 to $250 range. You can search for rebates in your area from here.
Note: Isolation valves are not included but are recommended for installation.
Released in 2010, the T-KJr2-IN & T-KJr2-OS are the smallest water heaters in the Takagi tankless line. This small, but powerful unit can meet all the hot-water needs of a small American home or apartment with one or two bathrooms. Designed to virtually do anything a 40-gallon tank-type water heater can do and more, the compact, wall mounted T-K Jr. can provide domestic hot water to plumbing fixtures and appliances.
Cost-efficient and environmentally friendly, the T-KJr2-IN can be converted into a direct-vent unit by using the optional TV10 conversion kit for installation in a garage, a utility closet or any confined space in which makeup air may be limited.
Specifications:
- Capacity: 1 to 2 Bathrooms
- Flow Rate: Maximum 6.6 GPM
- Gas Inputs: 19,500 to 140,000 BTU per hour
- Energy Factor Rating: 0.82
- Inlet Gas Pressure: Min: 5.0" W.C. / Max 10.5" W.C.
- Dimensions: 20.3" H x 13.8" W x 6.7" D
- Direct Vent Capability
- Electric Ignition
TK-REO2 Remote Control is included:
Specs
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| Application: | 1-2 Showers |
|---|---|
| Product Type: | Tankless Heater |
| Installation Type: | Indoor Only |
| Fuel Type: | Natural Gas |
| Energy Factor: | 0.82 |
| Vent Size: | 4" |
| Height: | 20.3" |
| Inlet Gas Pressure: | 5.0-10.5"W.C. |
| Width: | 13.8" |
| Manifold Pressure: | 2.0-2.5"W.C. |
| Depth (Inches): | 6.7" 7-3/4" |
| Max Flow (GPM): | 6.6 |
| Voltage: | 120v |
| Energy Star Rated: | No |
| Gas Input: | 19500-140000 BTU/h |
| Venting Requirement: | Category III Stainless Steel |
| Height (Inches): | 20.25" |
| Water Connection: | 3/4" |
| Width (Inches): | 13-3/4" |
| Gas Connection: | 3/4" |
| Temperature Range (F): | 99°F - 167°F |
| PSI Range: | 15-150 psi |
| Weight (lbs): | 33 lbs |
Questions?
Speak with a real person who will go out of the way to help!
Call or text 888-757-4774
Monday – Thursday
8am–7:45pm
Friday
9am–7:45pm
Saturday – Sunday
9am–5:45pm
You May Also Need
74 Replacement Parts
Filter Plug, 100074381
SKU: 100074381
TakagiKit, Damper, Fan, 100074344
SKU: 100074344
AO SmithRod Cap, 100074223
SKU: 100074223
AO SmithKit, Cable, Igniter, High Voltage, 100074224
SKU: 100074224
AO SmithKit, Burner Assembly, 100074345
SKU: 100074345
AO SmithOutlet Drain Plug, 100074383
SKU: 100074383
TakagiKit, Heater, 100074384
SKU: 100074384
AO SmithKit, Outlet, Heat, 100074263
SKU: 100074263
AO SmithManifold Gasket, A, 100074229
SKU: 100074229
TakagiHeat Exchanger Assembly (T-KJr2-IN), 100074346
SKU: 100074346
TakagiPCB, 100074348
SKU: 100074348
AO SmithManifold Assembly w/ Gas Valve Assembly (NG)
SKU: 100074349
TakagiKit, Wire, Gas Valve, 100074391
SKU: 100074391
AO SmithKit, Plate, Surge Box, 100074397
SKU: 100074397
AO SmithKit, Box, Junction, 100074199
SKU: 100074199
AO SmithKit, Plate, Fixing, Heater, 16, 100074310
SKU: 100074310
AO SmithKit, Clamp, Wire, 60, 100074233
SKU: 100074233
AO Smith
Need help finding a replacement part?
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Product Reviews
4.8 out of 117 reviews
97% would recommend this product
5 star
87%
4 star
9%
3 star
2%
2 star
3%
1 star
0%
Customer Images
Most Liked Positive Review
Used for in floor heat
I'm using this unit to run one zone to heat my 1,000 sqft garage. So far this is awesome! This unit is very quiet and makes 167 degree water effortlessly.
Here are some technical aspects of my system. I have one zone with three loops of half inch pex tubing (all loops are 300' each) I have a taco 00R-MSF1-IFC multi speed circulation pump With a taco SR501 switching relay. The flow rate of my system is 2.4gpm. With a solid plan of what I needed supply house delivered everything I needed in addition to the Takagi I got all the fittings, expansion tank, air separator, webstone multi valves and venting with no problems.
I should add that the customer at supply house is fantastic as well, my original order I purchased the z-vent 4" w/back flow kit I did end up returning and 100% hassle free.
My venting solution was resolved by buying the concentric termination kit, which I'm glad I did.
VS
Most Liked Negative Review
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Takes some time
Have experienced alot of cold water sandwiches and have to let it run longer than the Rheem unit I had. I had some programing issues the first week of operation that I had to call the toll free line. The customer support was great they walk you through the troubleshooting completely. For the money compared to the Rheem unit and the hassels I had with it this unit far exceeds my expectations. Definitely consult local building codes and install accordingly. Used in a 1200 sq ft apartment. Winter time groundwater is quite cold compared to some other areas of country. It will keep up but runs a little longer with frequent dips in temp.
Showing 1-10 of 117 reviews
Direct vent kit restricted air flow and made extreme noise.
I installed this with normal galvanized piping for venting and it worked perfectly! had the inspector come he told me it had to be stainless steel so I ordered the concentric kit for just under $200 moved my water heater to a outside wall and the first week it made a noise that could literally Wake the Dead when I used 3 gpm and above, if I use just one faucet one and a half gallons a minute it didn't do it but I remove the 3in intake and front cover off of it and it seems to work fine but a total waste of $200 on the direct vent kit I would definitely make sure and do your research and make sure you have enough airflow it was restricting the airflow able to intake through 3in pipe not sure why exactly but I contacted supplyhouse they are giving me a replacement for its discontined through the manufacturer. I might add the supply house support was absolutely flawless in their customer service I will definitely always be doing business with them the rest of my life.
Bradley
MI
7 years ago
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Froze and Broke
This product is advertised as an indoor hot water heater with "freeze protection." We had it installed in our tiny house. The tiny house was winterized by blowing out all the water lines. In the spring, we turned the water back on and water gushed from the bottom of the hot water heater. It had froze broke.
Rodney
MICHIGAN
7 years ago
Verified Buyer
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This is a great little unit!
Takagi TK Jr is an out-of-the-box success. Plug and play, trouble free.
David
Cheyenne Wyoming
7 years ago
Verified Buyer
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Great product
I actually just replaced the old water heater, the exact same thing, it lasted about 14 years, so installation wasn't to difficult, and so far it works great
Yard guy
Round Mountain, Ca
7 years ago
Verified Buyer
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Superb
Consistent warm water.. we live on a spring with a 1.6 gallon per minute flow. This is no issue fort our takagi tankless water heater. Amazing!!!
Dave
Franklinville. Ny
7 years ago
Verified Buyer
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Yes I would
I just love my water heater it's working nice
Dolove
Spfld,ma
7 years ago
Verified Buyer
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Excellent!
My new water heater is working well. It arrived quickly, in perfect condition, and was installed by a professional technician. Because it is in the basement, I insulated the water pipes to help with the "cold water sandwich." I appreciated the price (best I found,) the prompt delivery, and the kind telephone service about proof of purchase for warranty purposes. All in all....an excellent purchase in every way!
Linda
Burlington, MA
7 years ago
Verified Buyer
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Very nice product!!
It is a nice product and glad we purchased it!
WW
Nederland, Texas
7 years ago
Verified Buyer
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My second Takagi-Love love love!
I have now purchased 2 Takagi water heaters. The first one lasted 13 years!!!! I can not say enough good about this product
Twhite
Kentucky
7 years ago
Verified Buyer
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I would buy this item again
I was in a bine. I needed a tankless heater quickly to replace one that failed. This unit was delivered the next day. Installation was quick and it is working great.
Frank
Cleveland, Ohio
7 years ago
Verified Buyer
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Product Q&A
33 Questions33 Questions
Q: Can I use pvc venting.
Asked by Don 8 years ago
Add your answer
Verified Reply- SupplyHouse StaffNo, this unit must be vented with Category III Stainless Steel
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Q: unit is a T-Kjr2 outside LP unit. Unit is outside and I need a cover for the water lines and gas lines. Is there a cover available.
Asked by george 8 years ago
Add your answer
Verified Reply- SupplyHouse StaffThe pipe cover is part 100112188.
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Q: Can this be vented with 4" PVC?
Asked by Brett 9 years ago
Add your answer
Verified Reply- SupplyHouse StaffNo, it cannot.
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Q: Is this unit gone have good pressure for second floor 2 shower Will be install in beasment a I have kitchen at first floor and two bathroom at second floor probably 20' difference Please help
Asked by Janusz 9 years ago
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Verified Reply- SupplyHouse StaffIt would depend on your incoming water pressure and the pressure drop of the rest of your system. At 5gpm the unit would drop the pressure about 10psi.
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Q: I am thinking of replacing my 40 gal. hot water heater with a tank-less unit. My current hot water heater is vented up through the roof No other equipment is attached to it, can I attach the vent from the tank-less unit to the existing vent pipe
Asked by Rick 9 years ago
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Verified Reply- SupplyHouse StaffNo, the existing venting material would not be suitable for the tankless.
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Q: Hello. I what type of filter would go with this Tankless water heater? I heard that I need to buy a water filter so that the water heater won't get calcified and clog up. What would you recommend that would go with this product?
Asked by B tree 9 years ago
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Verified Reply- SupplyHouse StaffAquapure makes a scale inhibitor system for tankless water heaters, SKU AP43011. You should still have the service valves installed and flush the unit annually to make sure there is no buildup.
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Q: Can I run this unit with a 20 gallon propane tank?
Asked by CJB 10 years ago
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Verified Reply- SupplyHouse StaffAccording to Takagi, the unit should be run with a minimum of a 100 gallon tank. 20 gallon tanks would need to be pressure regulated, and tank temperature fluctuations can effect gas flow to the unit.
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Q: I am looking for a tankless water heater for an off-the-grid cabin I am building. Will have a generator so can supply the 120V power needed (unless there is a unit that does not require it!). My question is - I will be using 10-20 gallon portable propane tanks to fuel the unit - will they provide sufficient gas flow and what regulator will I need? Carl
Asked by Carl 10 years ago
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Verified Reply- SupplyHouse StaffAccording to Takagi, the unit should be ran with a minimum of a 100 gallon tank.
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Q: Is the T-KJr2-IN Enbergy Star Certified?
Asked by Jill 10 years ago
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Verified Reply- SupplyHouse StaffNo, it does not meet current Energystar requirements.
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Q: Can I vent this product in my venting chimney I only have my heating system venting threw it an the vent flows very well can I vent this tankless threw there as well
Asked by Quiet Storm 11 years ago
Add your answer
Verified Reply- SupplyHouse StaffThis unit must use category III stainless steel venting. Also, the manual states that you cannot common vent or connect any vent from other appliances to the water heater vent.
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