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Takagi T-K4-IN-NG Indoor Tankless Water Heater, Natural Gas

4.4 out of 5 stars 27 customer reviews
| 13 answered questions

Price: $737.99 & FREE Shipping. Details
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  • Indoor installation only; Direct-vent conversion optional
  • 11,000 - 190,000 BTU/hr
  • 0.82 energy factor
  • 8.0 GPM max flow rate
  • Exhaust and water temperature safety control
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Product Description

Color: White

Product Description

Released in 2010, the T-K4 improves upon many of the features from the T-K3. The T-K4 is one of Takagi's smaller tankless water heaters. At 13.8 inches wide and weighing only 38 pounds, its ultra-compact design allows it to be mounted on a wall. Takagi's newest tankless water heater also features an energy factor of 0.82, so it is extremely efficient and environmentally friendly. Since tankless water heaters only burn gas when hot water is needed, installing this unit can help homeowners save up to 45% on their monthly gas bills. Specifications: * Capacity: 2 to 3 Bathrooms * Flow Rate: Maximum 8.0 GPM * Gas Inputs: 11,000 to 190,000 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 8.5" D * Direct Vent Capability * Electric Ignition Type: Natural Gas (NG) Installation Type: Indoor Only Direct Vent Convertible Energy Factor: 0.82 Vent Size: 4" Vent Type: Category III Stainless Steel Inlet Gas Pressure: 5.0-10.5"W.C. Manifold Pressure: 2.0-2.5"W.C. Application: Plumbing Height: 20.3" Width: 13.8" Depth: 8.5" Max Flow (GPM): 8.0 Voltage: ? Voltage, or volts, is a measurement of the difference between two electric fields (in heating terms, the difference between the Earth's electrical field and the electricity running through your wires). 120 VAC Gas Input: 11000-190000 BTU/h Water Connection: 3/4" Gas Connection: 3/4" Temperature Range (F): 99?-167?F PSI Range: 15-150 psi Weight: 38 lbs

From the Manufacturer

The all new T-K4 models have an impressive max GPM of 8.0 GPM. This Tankless Water Heater adds 1 more shower over the Takagi T-KJr2 at minimal increase in cost and is perfect for domestic hot water as well as hydronic/radiant heating applications in mid size residential homes or apartments with 2-3 bathrooms.

Product Information

Color:White

Technical Details

Part Number T-K4-IN-NG
Item Weight 43 pounds
Product Dimensions 8.5 x 13.8 x 20.5 inches
Item model number T-K4-IN-NG
Size -1
Color White
Finish White
Item Package Quantity 1
Certification Energy Star
Batteries Included? No
Batteries Required? No
Warranty Description Residential: 12 year heat exchanger, 5 year parts and 1 year labor. Note: Water heaters of any type must be installed by licensed personnel or warranty will be void.

Additional Information

ASIN B0057X221K
Customer Reviews
4.4 out of 5 stars 27 customer reviews

4.4 out of 5 stars
Best Sellers Rank #119,907 in Home Improvements (See top 100)
#154 in Home Improvement > Rough Plumbing > Water Heaters & Parts > Water Heaters
#759 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 can be shipped to select countries outside of the U.S. Learn More
Date First Available September 13, 2010

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

Color: White
When it worked, it was fine. But the maintenance on these things and the WORST CUSTOMER SUPPORT EVER with guys with the heaviest unintelligible accents ever, who refuse to honor a single darned iota of the warranty makes this an unmitigated disaster and piece of garbage. I cannot stress this enough: AVOID AVOID AVOID.

I have installed about a dozen of these over the years, and only had two work properly for more than five years. And when they break, they are never ever fixable. It's rip off the old one and put in a new one, but Takagi constant changes its inlet/outlet configurations, so there's about about grand in plumbing costs right there.

I have several rental properties, and I installed a few Rheem units when I was low on cash because I got a close-out deal, and I thought those would be lousy, a short term solution. But over ten years later, they have been absolutely trouble free. Only one had an issue, and the warranty came through and they replaced it at their cost. I thought Rheem was supposed to be the bad US model, but it turned out very differently.

Do I need to come to your house right now and pour you a beer and talk you out of it? I should, because that's how awful Takagi has been to deal with. I love Japanese food, Japanese design, and Japanese people, but not this piece of Japanese trash or their lousy Japanese warranty people who live in California and refuse to take an English class so they can communicate to customers. All they know how to say is "no" and that's not okay.
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Color: White
These Takagi water heaters are nothing but a big pile of s***. I've had 2 of these so far in a rental house that I am a partner in. Each one lasted about a year and a half and started having problems with each unit after about 1 year, these were both brand new units I am talking about here. I called Takagi's "authorized" technician for my area when I had problems with unit #1. This so called "technician" knew nothing about these things or how to fix one. He suggested pulling out the circuit board and sending it back to the factory for repair. He said I would get it back "good as new" in about 3 weeks. Keep in mind that this is a rental house with a family living in it. I had no choice except to have the unit replaced with a new Takagi unit at a cost of around $1200. I thought the problems were solved.

Almost exactly one year later, the tennants call to say they are having problems with unit #2. I called a different "authorized technician" this time. He informed me that the unit just needed to be "descaled" and it would be fine. This descaling process also included a flush kit installed on the unit for $500. I did not have much confidence in this unit, but hoped it was fixed. About 3 months later I get a call from the tenants again stating that the hot water heater was not working again and had never really worked since the descaling process. I called the "technician" that had installed the unit and descaled it back again. He sent me a bill for $180.00 and claimed it was "fixed". I doubt the idiot ever did anything to it. Sure enough the tenants called the next day to inform me that it was not working. I was pissed.

I called another plumbing company and had them replace the unit again - this time with another brand of water heater.
Read more ›
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Color: White
I've had my T-K4-IN NG for over a year (installed May of 2011). It has met all of my expectations. Endless hot water for a household of 6. It replaced an older electric tank hot water heater that failed in spectacular fashion (gallons of water all over the floor). I like the fact that I do not have to worry about being the last one in the shower, or staying too long in the shower if there are others waiting to get in right after me. Great product, absolute pleasure to own.
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Color: White Verified Purchase
We purchased this water heater in December, 2012 and had it installed. As of March, 2013 we have lost hot water 11 times. We had the gas meter in our home made bigger twice by the gas company since one theory was that more gas was needed to fuel it. This was unsuccessful. We had a more expensive vent installed from the crawl space where the hot water is installed to the outside, this was unsuccessful. We have had local professionals interface with Takagi to troubleshoot the problem and it has always failed again.

Our home is 2000 sq ft and we live in Tennessee. The current theory being offered is that this size hot water heater works fine in FL or other states much farther south where the water does not need to be heated as much to reach the desired point (in this case, 117 degrees), but that we need a bigger one for our home. While we learned from our plumber how to reset the unit and make it work again, this would necessitate a trip to the crawl space (entrance on the exterior of the house) whenever the hot water went out - late at night, freezing cold out, etc. There is never a good time when you have an infant to go into a crawlspace and reset an electronic device.

In reviewing the return policy for this item, it is not nearly as generous as other smaller items we have purchased. It is not returnable for a full refund past about 6 weeks after purchase, and I would need to pay return shipping. We have invested hundreds of dollars to have this installed. While we are within 6 months of purchase and Takagi therefore is paying for the labor on these troubleshooting calls, we will have to figure out what to do with this $800 item that is not working and then spend the money to purchase a larger machine and have it installed. Needless to say, we are not happy.
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