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Takagi T-D2-OSNG Outdoor Tankless Water Heater Natural Gas


The NEW T-D2-IN model was specifically designed for light commercial applications. The T-D2-IN offers all the features of the "Revolutionary T-K3-Pro" model along with a max flow rate of 10.0GPM.

Utilizing HRS35 copper alloy for the heat exchanger tubing, the T-D2-IN/OS is also suited for heavier-residential usages such as space-heating and domestic recirculation systems.


  • Fully modulating, gas fired, tankless water heater
  • Indoor and Direc Vent installation only
  • Safety Features:
    • Air-Fuel Ratio (AFR) sensor
    • Exhaust & Water Temperature Safety Control
    • Overheat Cutoff Fuse
  • Internal Freeze-Protection System
  • Manual reset high limit switch
  • Easy-link up to 4 units without multi unit controller
  • HRS 35 Copper on Heat Exchanger
  • Power Cord included
  • Temperature Remote Controller included (TM-RE30)

Venting & Combustion

  • Horizontal or Vertical Installation
  • Power Vent
  • Electric Ignition
  • Flue 4" O.D
    • Category III/IV Stainless Steel
  • Intake 3" O.D
    • ABS, PVC Galvanized Steel, Corrugated Stainless steel or Category III/IV Stainless Steel
  • 4"; 50' Max Length, 5 elbows max(90° elbow = 5' equivalent length)


  • TK-BF01
    Backflow preventor
  • TK-KPCT43
    3x4 DV Concentric Termination
  • TK-TV10
    Direct Vent Conversion Kit
  • TK-KPWL4 and TK-KPWH4
    Wall Thimble Louver/Hood Termination
  • TK-PC01
    Pipe Cover


Download T-D2-IN/OS Manual

Download T-D2-IN Specification Sheet

Download T-D2-OS Specification Sheet

Natural Gas Input  Min. 11,000Btu   Max. 199,000 Btu  
LPG Input  Min. 11,000Btu    Max. 199,000 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. 
LP Gas Pressure Inlet   Min. 8.0" W.C.    Max. 14.0" W.C.  
Weight  39 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.    
LP Manifold Pressure  3.7-4.5" W.C.    


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