T-KJr2-OS Outdoor Tankless Water Heater
by Takagi

When you want a powerful outdoor tankless water heater, but need it to be compact as well, you've come to the right place. PlumbingSupply.com® is your Takagi Tankless Water Heater source, and we are pleased to offer the many Takagi models - one sure to be the right model for your home.
We also offer many more tankless water heaters by Takagi: T-KJr2-IN - T-K4-IN - T-K4-OS - T-D2-IN - T-D2-OS

Takagi T-KJr2-OS - Tankless Gas Water Heater for Outdoor Installations

T-KJr2-OS outdoor tankless water heater
  • The T-KJr2-OS is a small but powerful outdoor installation unit, designed to do virtually anything a 40-gallon tank-type water heater can do
  • Tankless water heating ensures that the last one in the shower won't run out of hot water
  • Ideal for light residential applications such as a small home, an apartment or condo with one or two bathrooms, cabins, or radiant heating systems
  • No venting required - saves time and money
  • Get rid of the hassle of a tank full of deposits or rust by going tankless!
  • Electronic ignition means no pilot light to waste gas
  • Computer-controlled burners use only the amount of gas required according to the demand, which significantly increases this unit's efficiency and can decrease your gas bill
  • Includes TK-RE02 Temperature Remote Controller, which allows the default factory setting of 122°F output temperature from the water heater to be adjusted within the range of 99°F to 167°F, and it also works as a diagnostic tool that will give a concise error code whenever there is a problem with the unit
  • View more detailed specifications
  • View flow rate and pressure loss information
  • Looking to install this tankless water heater inside? Click here
Takagi T-KJr2-OS Outdoor Tankless Water Heater with Remote Controller
Add installation accessories for IPS threaded connections
Add installation accessories for copper sweat connections

Please note: Some areas do not allow installation of a few of these water heaters. Read more

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Please note: For potential safety reasons, we do not recommend using PVC to vent gas tankless water heaters. For the best results, we recommend using Category 3 stainless steel gas vent pipe for all gas tankless water heaters.



Frequently Asked Questions

Q. "What type of vent do these tankless water heaters require?"
A. These tankless water heaters require Category III stainless steel vent only.

Q. "It sometimes drops below freezing where I live. Can I still install a Takagi tankless water heater outside?"
A. Takagi gas tankless water heaters are designed to be installed outdoors only in mild temperate climates. The factory-installed freeze protection device is rated for temperatures down to 5°F in a wind-free environment, so wind-chill factors must be taken into account when choosing whether or not to install a Takagi tankless water heater outdoors. If you are unsure if temperatures at your planned installation would work for an outdoor tankless water heater, we strongly recommend consulting with a trusted local professional.

Q. "I've heard that some Takagi tankless water heaters cannot be installed in a few areas. Is that true?"
A. Yes, there are some counties that do not allow for the installation of a few Takagi tankless water heaters. For this reason, the person purchasing one of the following models is responsible for checking with their local code authorities prior to ordering: T-M32-NG, T-D2-IN-NG, T-D2-OS-NG, T-K4-IN-NG, T-K4-OS-NG, T-KJr-IN-NG, T-KJr-OS-NG. Here's a list (not complete) of some California counties that do not allow these water heaters to be installed: Sacramento, Yolo, Sonoma, San Joaquin, Napa, Marin, Solano, Contra Costa, San Francisco, San Mateo, Alameda, and Santa Clara. Again, this list is not complete, so it's up to the purchaser to check with local code authorities prior to ordering.

Q. "What do I need to install these Takagi tankless water heaters outdoors?"
A. Outdoor-only Takagi tankless water heaters, such as the T-D2-OS or the T-K4-OS, require no additional venting components. Units that can be installed either indoors or outdoors, are designed to need only the addition of an outdoor vent cap or properly vented recess box in order to function in an outdoor installation. Please note that Takagi tankless water heaters, like most brands of water heaters, are designed to be installed outdoors only in mild temperate climates. As always, please consult with your installer or another trusted professional before installation.

Q. "If these units don't have a tank, how do they know when to turn on?"
A. These tankless water heaters have a flow switch built into them. When you turn on the hot side of a faucet the water begins moving. Once the water is traveling at minimum flow rate for the heater, the flow switch will turn on the gas.

Q. "Why can't I install the T-KJr2-OS myself?"
A. Improper installation of the T-KJr2-OS could create carbon monoxide gas and other dangerous gases. Installation of this unit by persons other than professionally trained technicians voids the warranty.

Q. "What's the difference between a conventional flue and a direct vent?"
A. A conventional flue is what most people are familiar with. It typically consists of a double-wall flue pipe going from the top of the heater through the roof, venting outside. The fixture draws its combustion air from the space around it (utility room, garage, hallway, etc.). A direct-vent unit vents and draws its combustion air through a specially designed pipe from the outside via an adjacent wall.

Q. "I live in an area where it freezes, what can I do to protect the heater from freezing?"
A. We recommend you use the TK-BF01 exhaust back flow prevention kit to prevent cold air from entering the vent and causing the heat exchanger to freeze.

Q. "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.

Q. "What's the first hour rating of this water heater?"
A. Traditional tank water heaters have a first hour rating which is determined by the amount of hot water the heater can produce in an hour when starting with a full tank of hot water. As tankless water heaters do not start with a tank of hot water, they don't really have a first hour rating the same way a tank water heater does. Instead, tankless water heaters have a gallons per hour rating, which is determined by how many gallons per hour the tankless water heater can produce when raising the incoming water temperature a specified amount.

All Takagi tankless water heaters must be installed by a licensed professional.


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