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

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

UPC: 671657108274

Finish: White

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

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.

  • 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 a remote control as a standard feature
  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes

Takagi T-K4-OS-NG 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

Takagi T-K4-OS-NG Overview:

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.

Takagi T-K4-OS-NG Dimensions:

  • Height: 20.25"
  • Width: 13.75"
  • Depth: 9.50"
  • Product Weight: 38 lbs.
  • Vent Type: Direct Vent
  • Vent Size: 4"

Takagi T-KJR2-IN-NG Safety Features:

  • Built-in Freeze Protection
  • Manual Reset Hi Limit
  • Overheat Cutoff Fuse
  • Inlet and Outlet Thermistors for Constant Temperature Monitoring
  • Flame Sensor

Takagi has delivered innovative hot water solutions for more than 70 years, and is sold exclusively by plumbing wholesalers and contractors. Takagi’s selection of residential and commercial tankless water heaters are unmatched for quality and diversity. Anywhere hot water is needed, Takagi provides an energy-efficient solution with long-lasting value for years after installation. Takagi stands behind its products and customers with world-class service, combining cuttingedge technology with committed people who take pride in being the very best.

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

4.5 Based on 3 Reviews

100% of Customers would recommend this product to a friend

Very Good product, Excellent takagi service

We have been replacing with tankless water heaters every property where the water heater has failed...and takagi has been my favorite. This is the second that I buy. I stopped looking for best alternatives. I am buying this one for my home too.


Good Design

Recommend to a Friend? Yes

Excellent performance would highly recomend

The product meets all required needs for residential use. The only thing in term of conservation is the time/travel, time of hot water to feel of touch. In drought stricken California any water waste isn't positively received. Otherwise its a great product.


Easy To Use
Quality Materials


Hot Water Travel A

Best Uses

Typical Residential Use

Recommend to a Friend? Yes

my second takagi

with a recirculation loop or just a metlund product this is the peak of energy and water conservation


Works Quickly
Precise Controls
Energy Efficient

Best Uses

Large Homes

Recommend to a Friend? Yes
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