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T-KJr2-IN Takagi Tankless Indoor Water Heater (Natural Gas)
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MANUALS (4)
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Product Highlights
Description
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
| 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?
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Product Reviews
Most Liked Positive Review
Used for in floor heat
Most Liked Negative Review
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Takes some time
Direct vent kit restricted air flow and made extreme noise.
Froze and Broke
This is a great little unit!
Great product
Superb
Yes I would
Excellent!
Very nice product!!
My second Takagi-Love love love!
I would buy this item again
Product Q&A
33 QuestionsQ: Can this unit be installed in crawl space and vented through foundation wall?
Asked by Grizzly Rider 12 years ago
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Verified Reply- SupplyHouse StaffThe crawl space would need to be able to supply enough combustion air to the heater, as outlined in the manual. If it cannot, you would need to purchase a direct-vent conversion kit (part TK-TV10) in order to set the unit up to bring in outdoor combustion air. Also make sure that your installation complies with any applicable local codes.
Q: Please clarify... If I want to convert to direct vent, which products are required? The 3" x 4" Adjustable Concentric Termination OR the Direct Vent Conversion Kit (T-KJr2-IN, T-K4-IN, T-D2-IN) OR BOTH? Thx!
Asked by Dano 12 years ago
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Verified Reply- PexSupply StaffThe direct vent conversion kit is required. It includes parts needed to create an outdoor fresh air intake on the heater and to cover the standard indoor air intake on the front of the unit. Concentric vent terminations would only be required if you wanted to have a single penetration from the building.
Q: i'm replacing a 50gal.hot water heater with a tankless can i use the existing venting?
Asked by Nick 13 years ago
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Verified Reply- PexSupply StaffYou can, as long as the existing venting is compatible with the T-KJr. unit (which requires 4" Category III stainless steel venting).
Q: The rpecification calls for a 3/4 inch gas inlet. Since we heat primarily ith wood, our propane supply is a 125 gallon tank with 1/2 inch pipeing. The unit will only serve one bathroom, but the well water in the winter is not much above freezing. Will the unit work for this installation?
Asked by peyster 14 years ago
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Ok. Here is the thing. You need to install a 3/4 pipe from the gas tank to the unit, even if the gas tanks and the unit are 1/2. The more 3/4 pipe are in between, the better the unit will work.!! Very important, otherwise the unit will shut off automatically for error 3. Make sure the unit has its pipe fumes well installed, i mean, it has to have at least 35 inches of vertical pipe and then you can use an elbow. And for the water, just make sure the pressure goes up to 20 psi at least.. With this i think you wont have any trouble.. Refards. Alex Sent from my iPhone
You might get lucky. It depends what other appliances are served by the gas line and how far the unit is from the tank. Among other factors. If you use 2.5 gpm at 80 degree rise then you will need just about the full 140,000 BTU rated input for the tk junior. Phelps Clarke ***.****
I just installed a unit in similar circumstances. 6 months ago. no problem with the operation, customer has had consistent hot water. We did have a problem with sand from the well. make sure that the water supply is well filtered. seems like a nice unit
Q: If the power goes out, can I manually start the flame?
Asked by ned 14 years ago
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u must have power (120vac) to operate the onboard computer. if u don't have power to your house, u can rig it up with a small converter (available at auto parts or building supply store for temporary power. Donald-Wade:Hildreth
No. There is an internal blower and microprocessor that need to be powered up. You could run the unit off of a very small generator though. Power draw is very low. Mark
This unit can not be used with out power Sent from my iPad
unless you got some kind of battery/generator backup the answer is no.
No, a Takagi water heater needs power to vent gasses out of it. If there is no power it would be dangerous to try and light it, and I don't think it would work.
No
If the power is out, then your pump won't run so no need to light the flame.
no. even if you could you need power for the internal controls...
no
Q: IM HAVING TROUBLE WHITH UNIT NOT FIRING WHEN FILLING DISHWASHER HAVE TO RUN KITHEN SINK AT SAME TIME SOMETIMES WONT FIRE FOR SINK PLUMER TOLD ME I NEED MORE FLOW THREW UNIT CAN ONLY GET 1 GAL PER MIN OUT OF SINK WITH SCREEN OUT HAVE TO GO TO BATH AND RUN WATER THERE ALSO WHAT A PAIN TO WASH HANDS SEEMS LIKE I NEED 2 GAL PER MIN FLOW THAT IS CRAZY AMOUNT OF HOT WATER TO WASH HANDS WHAT WOULD YOU SUGGEST
Asked by 15 years ago
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Verified Reply- PexSupply StaffThe unit should fire with no problem. It sounds like the sensor might need to be cleaned.
Q: I currently have a T-Kjr (2006) installed to heat a closed radiant floor system at an elev. of 6,000 ft (near lake tahoe). The heat area is 2,100 sq ft broken into 5 zones. The current unit seems to be having to work to hard for this use. Is there an alternative that would be more effecient, cost effective, and better suited to my needs? I do have sufficent room for a floor based unit or tank type.
Asked by wade 15 years ago
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Verified Reply- PexSupply StaffFor heating a better choice would be a boiler over a water heater or tankless water heater. Boilers are designed for heating where water heaters/tankless water heaters are more designed for plumbing.
Q: Will this unit work with preheated water?
Asked by 15 years ago
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Verified Reply- PexSupply StaffYes, it will.
Q: Can you use the tankless water heater with a recirculation loop.
Asked by milt 15 years ago
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Verified Reply- PexSupply StaffYes, you can.
Q: Are there any disadvantages/limitations of using this product in a radiant space heating application as opposed to a boiler?
Asked by Matt 15 years ago
Add your answer
Verified Reply- PexSupply StaffThe only disadvantage would be efficiency. Tankless water heaters are not designed for radiant heating applications and will usually not yield maximum efficiency if used for radiant heat.