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T-KJr2-OS Takagi Tankless Water Heater, Outdoor (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.
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.
TK-REO2 Remote Control is included:
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
- No Venting Required
- Electric Ignition
Specs
| Application: | 1-2 Showers |
|---|---|
| Product Type: | Tankless Heater |
| Installation Type: | Outdoor Only |
| Energy Factor: | 0.82 |
| Fuel Type: | Natural Gas |
| Inlet Gas Pressure: | 5.0-10.5"W.C. |
| Manifold Pressure: | 2.0-2.5"W.C. |
| Height: | 20.3" |
| Energy Star Rated: | No |
| Width: | 13.8" |
| BTU (Min): | 19500 |
| BTU (Max): | 140000 |
| Depth (Inches): | 6.7" 7-3/4" |
| Height (Inches): | 20.25" |
| Max Flow (GPM): | 6.6 |
| Width (Inches): | 13-3/4" |
| Voltage: | 120v |
| Gas Input: | 19500-140000 BTU/h |
| Water Connection: | 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
Great use of small places
Most Liked Negative Review
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worked great till it didn't
Not for commercial
Nice no-frills tankless outdoor propane water heater
I would buy this product again
Positive experience
Yesss
Terrific Unit!
I did by again and again !!
Best customer service EVER!!
Great heater, great value
Excellent service
Product Q&A
15 QuestionsQ: can it be used inside?
Asked by Tod Rod 9 years ago
Add your answer
Verified Reply- SupplyHouse StaffNo, it cannot. The exhaust vents out of slots on the front of the unit which would be extremely dangerous in an enclosed space.
Q: What is the vent pipe size? Thanks for your help.
Asked by Ron "banjoassant" 10 years ago
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On the outdoor tankless there is no vent pipe--the unit vents from a horizontal slot across the top of the unit. J. J. LaRue Thomas
Q: Hi, I have a question regarding this unit venting, I have a 40 Gal tank water heater and it is venting thru the chimney. Can I replace with this unit and using the same venting system? Thanks Jason
Asked by Jason 11 years ago
Add your answer
Verified Reply- SupplyHouse StaffThe T-KJr2-OS is meant to be installed outside, and uses no venting. The indoor units require category III stainless steel venting, so it is unlikely you can use existing venting if you had a standard atmospheric water heater previously.
Q: can you tell me the max temp?
Asked by Joel 11 years ago
Add your answer
According to instruction manual, with the remote controller, the max temperature is 167°F, without the remote, it is 140° F.
The heater is set for 122 from the factory. There is a model that has remote control heat settings. I am not sure what model goes to what temp. but one can go to 165 degrees. There are dip switches inside and different combinations of up and down make different temperatures. I do recall something coming with the heater that said do not set it yourself; get a plumber to do it. Here's a link to an installation manual. http://www.takagi.com/media/19139/110-310-510-TKJr2-TK4-TD2-Installation-Manual-62S051-4.pdf
Q: Curious about the "no venting" in the description. I am afraid that must be for the electric model. So what does this natural gas one use to vent with? Since the unit will occupy the HVAC closet, which has been moved to the attic, I will reuse the hole in the roof the HVAC system used for venting. The HVAC system has gotten a new vent further down the roof. I plan to mount this directly below the existing vent hole, but need to know what kind of vent pipe to use? This website does not say a word, nor do any others. I have seen 3" PVC written about other brands, and very expensive painted metal pipes for another brand. ANd now I am confused. I want to order everything at once.
Asked by Gruene Queen 12 years ago
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This model is to be installed outside, that is why it is no vented. There is a model for inside installation which is vented.
You do not want to be looking at the outdoor model, which vents out the front directly into the outdoors. Mine is gas, on an exterior wall, and vents through the horizontal slots at the top of the heater (you can see them in the picture). There is an identical heater with a vent kit--look up that one. Jacqui
Q: How many watts of electrical power are needed by this bad boy? I would like to wire in a stand-by, battery-operated power inverter in case of a power outage.
Asked by Joe 13 years ago
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Mine is a natural gas model and is only using electricity to fire the burner. No where does it state wattage; it's just labelled, "120 volts, less than 3 amps." J.
This runs on standard 110/120 AC outlet. You only power a circuit board. HAROLD D. HOLLAND
wattage = voltage multiply by Amp 120 x 3 is 360 W. it operate with less than 3 amp so it would be less than 360 Watts.
Q: will this work up in high altitude and in freezing weather. My place is @ 7500 feet from sea level and it get @ -10 degrees "Fer" will this work for me?
Asked by Bryan 13 years ago
Add your answer
Verified Reply- PexSupply StaffWe would not recommend using an outdoor unit in an area where temperatures get below freezing. You would need to contact Takagi directly in order to make modifications for altitudes higher than 6,000 feet.
I think Takagi has specified that the outdoor unit should not be sold where winter temperatures fall below an occasional +10 degrees. You'll probably want to ask Takagi themselves--they have a couple of U.S. 800 numbers. J.
Q: Can this be used outside for a camping shower? It looks like it needs an electric start, can that be converted to battery for this use?
Asked by Rocky 13 years ago
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This particular one needs to be wired to 110. I do not know if they make a battery start and that would be a brilliant idea. You should contact the company! J.T.
I think it would be difficult due to the piping for gas or propane. If DC can be converted to 120 AC, there is a possibility it could work. HAROLD D. HOLLAND
Not only the start is electric, but it also has an internal computer, a fan and a system that runs on electricity. It needs to be connected to a source of electrical power. 110V Eduardo
Is this unit going to be installed according to specs and vented properly, if not, I would not suggest it. HAROLD D. HOLLAND
Q: I have a new pole barn work shop. Can I utilize this water heater for closed hydronic floor heat system?
Asked by Doug 14 years ago
Add your answer
Verified Reply- PexSupply StaffYou can use Takagi T-KJr. water heaters for closed-loop hydronic systems, but we would recommend the indoor model for use in colder climates.
Yes, I have more than 60 units for this use. Eduardo
Q: What is the warranty on this unit?
Asked by Dan 14 years ago
Add your answer
Verified Reply- PexSupply StaffPlease see the following: http://s3.pexsupply.com/manuals/1296597322000/46961_PROD_FILE.pdf