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Takagi T-K4-OS-NG Tankless Water Heater, Natural Gas, Outdoor

4.5 out of 5 stars 16 customer reviews
| 19 answered questions

Price: $820.00 & FREE Shipping
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  • 190,000 BTU
  • 8.0 GPM max flow rate
  • No venting required
  • Inlet, outlet thermistors for constant temperature monitoring
  • Built-in freeze protection
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$820.00 & FREE Shipping In stock. Usually ships within 3 to 4 days. Ships from and sold by TheEnergyConscious.

Frequently Bought Together

  • Takagi T-K4-OS-NG Tankless Water Heater, Natural Gas, Outdoor
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Total price: $939.94
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Product Description

Color: White

Product Description

Takagi T-K4-OS NG The all new T-K4 models have an impresive max GPM of 8.0GPM ! The T-K4-OShas a built-in power venting system and was designed specifically for outdoor installations. The T-K4-OS does not require any additional Category III venting or vent caps, making installation one step easier for installers. The T-K4-IN can be installed indoor with option DV kit available. Natural Gas Input: Min. 11,000 Btu, Max. 190,000 Btu Gas Connection: 3/4" NPT Water Connection: 3/4" NPT Natural Gas Pressure Inlet: Min. 5.0" W.C., Max. 10.5" W.C. Weight: 38 lbs Dimensions: 20.5" X 13.8" X 8.5" Ignition: Electronic Ignition Electrical Supply: AC 120V (60 Hz) Water Pressure: Min. 15 psi, Max. 150 psi Natural Manifold Pressure: 2.0-2.5" W.C.

From the Manufacturer

The all new T-K4 models have an impressive max GPM of 8.0GPM! The T-K4-OShas a built-in power venting system and was designed specifically for outdoor installations. The T-K4-OS does not require any additional Category III venting or vent caps, making installation one step easier for installers.

Product Information

Color:White

Technical Details

Part Number T-K4-OS-NG
Item Weight 38 pounds
Product Dimensions 8.5 x 13.8 x 20.3 inches
Item model number T-K4-OS-NG
Size -1
Color White
Finish White
Item Package Quantity 1
Certification Energy Star
Batteries Included? No
Batteries Required? No
Warranty Description 5 year heat exchanger, 3 year parts and 1 year labor (residential only. 3/1/1 in commercial applications). Warranties are only valid if unit was installed by a properly licensed technician

Technical Specification

Additional Information

ASIN B0057X265M
Customer Reviews
4.5 out of 5 stars 16 customer reviews

4.5 out of 5 stars
Best Sellers Rank #75,129 in Home Improvements (See top 100)
#93 in Home Improvement > Rough Plumbing > Water Heaters & Parts > Water Heaters
#476 in Home Improvement > Electrical > Testers > Multi Testers
Shipping Weight 42.8 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available September 13, 2010

Warranty & Support

For warranty information about this product, please click here [PDF ]
For warranty information about this product, please click here [PDF ]

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Color: White
I do not write many reviews but felt the need to praise this product and company. The 1st thing to understand is this technology is relatively new as opposed to a conventional tank water heater. With that said here is my experience. I had this models predecessor installed in 2008 a t-k3 along with the appropriate filters in front of it to protect it from hard water deposits a MUST ! Unit worked flawlessly for 5 years, I had the annual service performed, descalling and cleaning the heater core and filters . I began to have some trouble with the unit then not turning on once in a while, I called the Takagi help desk and they sent me the needed parts igniter and technical instructions at no charge. I performed the service replaced the gaskets and the unit worked well until 2014 before acting up again. When I pulled the cover I noticed that there was corrosion occurring as a result of tiny water leaks, I called the Takagi help desk and they totally supported the now 7-8 year old product and sent me all the new parts and technical instructions at no charge to repair the issue. I am technical and performed the service myself it took about 2 hours to swap the water exchanger and gas control module, but the unit is now fully operational. I am very pleased with Takagi support of the product, as it was clearly outside of the warranty period. I will defiantly buy another Takagi when this ones life is over!
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Color: White
I had this installed to my home in April, 2014, so it has now been running my house hot-water system for 6 months. I cannot believe how it has exceeded my expectations. I live alone, and my hot-water usage is limited to basically daily showers I take and running my dishwasher 4 times a week! (I do my laundry in cold water.) Why do I need water boiled in a tank every day, just to rust out, and then leak water all over when it fails?

One really great thing I learned, after installing this item's remote control [on the wall above my garden-tub's fixtures], is that I can choose from 10 settings for temperature, instead of just one! In summer, for showers, I set it at 115 degrees, using less cold water to cool my shower. In winter, I set it at 140 degrees, since I like warmer showers when it's cold outside. For my dishwasher usage, I set it at 167 degrees (I am one of those people who runs the hot water to my kitchen sink, PRIOR to starting up the dishwasher).

The 10-year warranty doesn't hurt, either, as these units are known to last 20 years easily, with proper maintenance. I had decided to rid myself of a tank heater as soon as mine had quit. It did quit, leaving a real mess behind, in March. My hot-water heater closet [entrance through outside door in backside of my house on my breezeway-patio] has now been made into a storage closet for related patio and gardening items, complete with stick-up motion-detector LED light inside for night-time. So wonderful.
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Color: White Verified Purchase
This tankless heater came recommended to me by three other contractors I know.

They did not dissappoint me. the unit ,once installed is flawless and workd perfectly.

I have nothing bad to say of this unit at all !!

I will say that it would probably be best if this unit is installed by a professional.

First it doesn't void your warranty and second it is not just a plug and play item.

Once installed you will love it.
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Color: White Verified Purchase
We are a few weeks in. It was installed on our new home by a professional plumber and so far works perfectly. We have 1-1/2 baths and two adults so there's no real competition for hot water - at most it might be a dishwasher or load of laundry running while someone showers, but even that is rare.

I like it and expect to save significantly on our gas bill compared to a conventional water heater.
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Color: White Verified Purchase
This is my third Takagi tankless water heater. The first two have been in use for several years without a problem. One is an indoor unit. The other is in a garage. Never had a problem with either one, so it was a no-brainer to order another one for a client.
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Color: White
Had this product for less than 18 months and already had to pay almost as much in repairs as this thing retails for (was installed on a remodel shortly before I purchased the home). To compound the issue, Takagi only licenses a select few repairmen that they'll work with, and those repairmen then have to call in to the Takagi help line to have someone read them back instructions to diagnose/troubleshoot the problems. The repairman I had out wouldn't outright say that he thinks it's a poor build, but he did confirm that he gets a lot of business repairing Takagi water heaters.

So to review, poorly made product, short warranty coverage for something that's supposed to be a long-term investment, and extremely restricted in who can actually repair the product. I will very strongly recommend that anyone looking for a reliable water heater stay far, far away from Takagi products.
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Color: White Verified Purchase
top quality workmanship, instruction book was the best i have seen. get the suggested cabinet for it for outside install.
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Color: White Verified Purchase
We have had a terrible time with tankless water heaters and are elated with this one. Flawless, perfect, works every time. Tboat.
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