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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: What type of venting material does this unit need? Does it require type B vent or something different?
Asked by Maddmonk 11 years ago
Add your answer
Verified Reply- Supplyhouse StaffYes, this unit requires Cat.III stainless steel venting piping, based on your local codes it may also require B-vent.
Q: Can this be used with a 20lb propane tank?
Asked by LB 11 years ago
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Verified Reply- Supplyhouse Staffwith the correct regulator it should work, you should consult Takagi or an installer to verify.
Yes, I have done this on a temporary basis (that became weeks) and it worked flawlessly. No worries operationally. Only issue might be usage of propane relative to a small tank.
Q: I'm thinking of using this to replace my current 40 gallon unit. My current unit vents straight up and then joins in with the Furnace exhaust before the roof. Will I need to change this setup, or will this unit exhaust just fine with the furnace?
Asked by VGG 11 years ago
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Verified Reply- Supplyhouse Staffthe unit needs to be vented separately
Q: The Takagi T-KJr2-IN meets what I am looking for but it is propane. I have natural gas and solar electricity. what would meet my needs?
Asked by sylvia 11 years ago
Add your answer
Verified Reply- Supplyhouse Staffthe same unit in NG. http://www.supplyhouse.com/Takagi-T-KJR2-IN-NG-T-KJr2-IN-Takagi-Tankless-Indoor-Water-Heater-Natural-Gas
Q: Hello, I am trying to use this for a hot water heating system. The system will operate just fine at 122F, however when trying to get the temperature to go up from 122, the control panel will not let me and beeps 3 times. I can adjust down just fine. The propane pressure is 12.5. Cannot think of what else to do, still waiting around to hear back from Supply house.
Asked by BigTires001 11 years ago
Add your answer
Verified Reply- Supplyhouse Staffyou would need to contact Takagi, that maybe the max temp based on entering water temp & flow rate.
After talking with takagi they determined it had to be something with the computer control board. I had another one and it worked perfectly. Just a side note there are many variations of this heater, they all have the capability to reach 167F. Does not matter about flow rate, fuel type etc' The only factor you must have it the control panel to set above 140F, which comes with it and I feel is very useful for determining Delta T and flow rate. If you do not have the control panel for some reason there are dip switches on the low voltage panel that allow you to manually set the temp from 122F to 140F in a few increments.
Q: Will this unit work as a back up for a solar water heating system? Will the water flow through when it is hotter than set temp? Or would I need to run some sort of by pass system? The coolest the solar water ever gets is @ 90F not quit hot enough for a good shower.Thank you for the info.
Asked by kwikenuff 12 years ago
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Verified Reply- Supplyhouse Staffyes, both maybe more efficient.
Yes. The Takagi will simply stop burning fuel if the water is within about 5 degrees, soon as the temperature gets lower it will slightly top off the temp to you desired level. Also if you use the included control panel You can still watch the water temperature on the inlet and outlet as well as the flow rate even if the takagi is powered off by the control panel or it is simply not heating water.
Q: I need to know more about the direct vent. My current tankless is vented thru the chimney and seems to be fine. Nothing else uses the flu. What problems can I have if vented that way?
Asked by Jill 12 years ago
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Verified Reply- Supplyhouse Staffoften these direct vent will not have the pressure to properly exhaust if the flue is not run as per manufacturers guidelines.
Q: Does this unit need a pressure release valve on the output?
Asked by Richard 12 years ago
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Verified Reply- SupplyHouse StaffYes, it is recommended to include a pressure relief valve with the unit. Takagi offers a set of them for this unit: http://www.supplyhouse.com/Takagi-TTM-IV32-AB-Lead-Free-Isolation-Pressure-Relief-Valves-3-4-FNPT-x-FNPT-T-M32
Yes you will need a pressure relief valve. The gentleman before me suggested these isolation valves which I also suggest: http://www.supplyhouse.com/Takagi-TM-IV50-AB-Lead-Free-Isolation-Pressure-Relief-Valves-1-FNPT-x-FNPT-T-M50 However I would only add to that by mentioning that the pressure relive valve itself is a separate piece screwed into the hot side of the isolation valve kit. The actual pressure relive valve that comes with the kit is 150PSI, which is way too high for todays radiant heating systems. If running a radiant heat system I would suggest 30PSI for the relief valve itself as you typical run these systems from 12-15 psi. http://www.supplyhouse.com/Cash-Acme-20166-0030-3-4-F30-Pressure-Only-Safety-Relief-Valve-30-PSI
Q: what about valves for water lines and on hot side for T&P installation?
Asked by Amen Plumbing & Heating 12 years ago
Add your answer
Verified Reply- SupplyHouse StaffWe would recommend part 9007604005, which includes shut-off valves and a pressure relief valve. T-KJr2 units include a high‐temperature shut-off switch, which can serve as temperature relief unless local code requires an external temperature-relief valve.
Q: Can this unit be converted to natural gas?
Asked by Rachel 12 years ago
Add your answer
Verified Reply- SupplyHouse StaffNo, This unit cannot be converted from propane to natural gas.