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Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater review

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater

If you are interested in purchasing a sizable outdoor water heater for your residential apartment, then the Takagi T-Kjr2-OS-NG outdoor tankless water heater is for you. It is one of the smallest in size among the Takagi models and is made for a sizeable home. It has a natural gas base and can be used as a vent unit.

This Takagi outdoor tankless water heater has a dimension of 20.5”H x 13.8”W x 6.7” D with a flow rate of 6.6 GPM which allows it to supply a constant flow of hot water with maximum efficiency. It can only be installed outside. It operates on gas but is highly energy efficient and eco-friendly.

Key features

Compact in size and easy to use

This product is very compact in size and weighs just 38 pounds. It is very convenient for use and is designed for outdoor installation only. It does not take more than an hour before you can complete the installation process.

Excellent technology

This model is equipped with freeze protection which is very necessary for an outdoor water heater. The desired temperature can be easily set by using the temperature adjuster. Although it does not require any venting, electricity is needed for its ignition. You will be amazed by its rate of water flow and its high range of BTU/hr.


This product has been certified by energy star for its outstanding quality, eco-friendliness, and energy efficiency. This certification comes in recognition of its numerous features which allows it to function effectively even in the harshest weather condition. Consequently, this has helped to ease your mind concerning the understanding of its performance and cost-effective qualities.


  • It can work conveniently with either propane or natural gas with the help of a conversion kit.
  • It has an energy factor of 0.82 and a BTU of 140,000.
  • It has the capacity to withstand harsh weather conditions.
  • Can be installed outside the house.
  • Does not require vents
  • Availability of dip switches for the control of temperature
  • It has a maximum flow rate of 6.6 GPM
  • Comes with an internal freeze protection
  • Perfect for light residential apartments


  • Cannot be installed in homes outside the temperate regions
  • It requires electricity for its ignition
  • You may have to acquire additional components before it works
  • It is not designed to work with a battery like other outdoor water heaters

Frequently Asked Questions

What is the minimum temperature setting on this unit?

The lowest setting is 113 while it is 122 as default. However, the highest is at 140 degrees. You can use the dip switches to control it or may decide to buy a thermostat.

What happens if the power goes out while the temperature is below freezing?

This is yet to be experienced. However, the system sometimes does not respond in situations that hot water needs are not required, especially where a sink faucet is half turned on.

Routinely the hot water will go out and stop working for a few minutes. How can this be fixed?

Endeavor that you set the temperature of the unit to the highest level that you intend to use. Then turn on your shower control to enjoy the hot flowing water.

Can propane be used for this model?


My hot water tank is under the house in the crawl space with my HVAC unit, very big space, will the outdoor be the proper one?

No. This product is designed for outdoor use only. Otherwise, you will have to expend much in terms of venting to avoid the dangers of carbon monoxide and fire.

What is the right size for two bedrooms, 2 baths unit and a family of 3?

This unit works well even in 2 showers and in the kitchen.

It seems as if tankless heaters are intended to be used in one room (kitchen or bathroom). Can’t they be used to supply hot water for the entire house?

This product has been our only source of hot water supply for the entire house with 6 persons for about 10 years now. It is very efficient in all ramifications.

Where is this unit made in?



The Takagi T-KJr2-OS-NG Outdoor Tankless Water Heateris designed for your convenience at any time. However, it is made solely to the benefit of those that are living in the temperate regions. It is equipped with freeze protection and temperature control for your ease of use.

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