Takagi T-K4-IN Indoor Tankless Water Heater, Natural Gas, 190KBTU, incl. TK-RE02


Brand: Takagi

Mfr Part#: T-K4-IN-NG

Availability: In Stock
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  • Description
  • Literature
  • Reviews (3)
  • FAQs (1)

Takagi T-K4-IN-NG Tankless Water Heater has gas inputs up to 190,000 BTU per hour and an energy factor of 0.82. The all new Takagi T-K4-IN-NG has an impresive max GPM of 8.0GPM.


Includes TK-RE02 Remote Temperature Controller.


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.


Takagi Tankless Water Heater T-K4-IN has four preset temperatures: 113F, 122F, 131F, 140F.  

To achieve any temperatures other than those presets, use the Takagi TK-RE02 remote temperature controller .

To convert the water heater from a standard vent system to a direct‐vent (or sealed combustion) system, use TK-TV10 Direct‐Vent Conversion Kit. By default (indirect vent), the unit will use the intake air from the room where it is installed.


  • Fully modulating, gas fired tankless water heater;
  • Indoor installation only(Direct-vent convertible);
  • Safety Features:
  • - Air-Fuel Ratio (AFR) sensor;
  • - Exhaust & Water Temperature Safety Control;
  • - Overheat Cutoff Fuse;
  • Internal Freeze-Protection System;
  • Manual reset high limit switch;
  • Horizontal or Vertical Installation;

Technical Specifications:

  • Fuel Type: Natural Gas;
  • Max BTU Rating: 190,000 BTU/h;
  • Min BTU Rating: 11,000 BTU/h;
  • Max. Flow Rate: 8 GPM (Gallons Per Minute);
  • Water Pressure: 15 - 150 psi (40 psi or above is recommended for maximum flow);
  • Energy Factor (Natural Gas): 0.82;
  • Hot/Cold Water Connections: 3/4" NPT;
  • Gas Connection: 3/4" NPT;
  • Weight: 34.6 lbs;
  • Dimensions (inches): 20.3" high x 13.8" wide x 8.5" deep;
  • Electric Consumption: 120 VAC ; Standby: 0.05 A, Operation: 0.73 A, Freeze-Protection: 0.93 A;
  • Ignition: Electric Ignition;
  • Natural Gas Pressure Inlet: 5.0" W.C. min.; 10.5" W.C. max;
  • Manifold Presure (Natural Gas): 2.0" W.C.;
  • Temperature Settings (dipswitch settings without remote controller): 113F, 122F, 131F and 140F;
  • Temperature Range (with TK-RE02 Remote Control): 99 - 167F (122F Default factory Setting);
  • Venting Intake: 3" O.D. (ABS, PVC, Galvanized Steel, Corrugated Stainless Steel or Category III/IV Stainless Steel);
  • Flue/Exhaust: 4" O.D. (Category III Stainless Steel);
  • Vent: 50' Max Length, 5 elbows max;
Takagi T-K4-IN Indoor Tankless Water Heater, Natural Gas, 190KBTU, incl. TK-RE02 has an average 5.0 out of 5 rating based on 3 user reviews.
2 of 2 people found this review helpful.
Save money on your gas bill, save floor space too
By DIY installer (from San Jose, CA) on 10/21/2015
These units are great for reducing your monthly gas bill. This is the second one I've installed, and I would recommend them to anyone looking to eliminate having to heat a regular 40-50 gallon water heater 24/7.If you are installing one for the first time, the two suggestions I can offer are to make sure you have already met the increased gas line requirements, and to make sure you vent it properly as described in the owner manual.The T-K4 is an improvement over the older model it replaces as it is even smaller in size while outputting more GPM. We have had this unit up and running for about a week now, and it is great!
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1 of 1 people found this review helpful.
Great for low use beach house
By DIY homeowner (from Oregon) on 9/16/2014
We have had this water heater (purchased from PexUniverse) in our beach house for about a year now, and are very pleased. So far, it has supplied all the hot water we need any time we want. We can easily run two showers at a time, and of course, you can take as many serially as you want. We don't seem to have the low water demand problem that the other reviewer asks about. The thing I really like about this water heater is that when we aren't there (we use the beach house about 1 wk/mo) the cost is ZERO, vs. about $30/mo. with our old tank water heater. That alone will pay for the water heater in a couple of years.
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1 of 2 people found this review helpful.
By Casey V. (from Mitchgan) on 3/27/2012
We have an existing system and the heater seems to have problems when the water demand is low, the heater does not kick in and there is no heat.Is this unit set up for something like it?
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Does the TK-RE02 remote come with this?
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1 of 1 people found this answer helpful.
Yes, the remote temperature controller is included.
Answered on 9/16/2015 by PexUniverse Customer Service
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