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

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Takagi T-K4-IN-NG Indoor Natural Gas Tankless Water Heater
Retail Price: $1,390.00
Our Price: $774.00
* Free shipping on orders over $199.

In Stock

Ships within 2 - 3 days from our warehouse.

Model: T-K4-IN-NG

UPC: 671657108250

Finish: White
T-K4-IN-NG Takagi Indoor Natural Gas Tankless Water Heater

The compact T-K4 is a fully modulating, gas fired, tankless water heater perfect for residential applications. With gas inputs of 190,000 BTU, the T-K4 can produce enough hot water for up to three bathrooms in warmer climates.

The T-K4 supplies hot water to domestic hot water systems (directly or indirectly) which can be used with storage tanks, recirculation systems, hydronic heating systems, radiant floor systems, and/or domestic & heating applications.

Features :
  • ENERGY STAR qualified
  • 15-year limited heat exchanger, 5 yrs limited parts Residential use
  • Energy Factor of 0.82 for Natural Gas
  • Maximum flow rate of 8.0 GPM at 35°F temperature rise (4.4 GPM at 70°F rise)
  • Includes both a remote control and power cord as standard features
  • Venting with Category III stainless steel
  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes
Specifications :
  • Emissions : Low NOx
  • Maximum BTUs : 190,000
  • Minimum BTUs : 19,500
  • Water Connection Location : Bottom
  • Water Connection : 0.75"
  • Flow Rate : 8.00
  • Heat Exchanger : Copper
  • Voltage : AC 120V
  • Energy Factor : 0.82
  • ENERGY STAR® Qualified : Yes
  • Remote Control : Yes
  • Technology : Non-Condensing
  • Multilink : No

T-K4-IN-NG Reviews - Submit A Review

3 Based on 4 Reviews

50% of Customers would recommend this product to a friend

This replaced my 13 yr.old TK2

It is slightly smaller than the TK2, but has a little more capacity. Also, all the connections are on the bottom instead of the side as they were on the TK2. This led to a major rework of the mounting platform and all piping connections. Took as much work to replace the old heater as it did to install the old one. Other than that frustration, I am pleased with the new T-K4 -IN-NG heater, particularly with the wall mounted Temperature Remote Controller that was included.I have a second TK2 heater which was installed at the same time as the one which was replaced by the T-K4. The one that was replaced started giving problems with keeping heating unless you had a high water flow. While I am a retired Licensed Professional Engineer who did all of the original installations, I elected to replace rather that try to trouble-shoot the problem, due to the age of the unit. I will definitely replace the second TK2 with one of these when it starts giving problems. The only problems I ever encountered with the two TK2s was the power supply boards which went out on both units when they were about 3 years old. Unfortunately, at that time the warranty for parts was only for one year.

Recommend to a Friend? Yes

Manufacturers Support Lacking

Product did not work upon delivery. Manufacturer has not backed his warranty.


Easy to install


Poor Manufacturer Support

Recommend to a Friend? No

No Manufacturers Support

Does not work. No certified service

Recommend to a Friend? No

Did it myself!

radiant heat/hot water


Works Quickly
Energy Efficient
Precise Controls

Best Uses


Recommend to a Friend? Yes
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