Takagi TH3SDV Natural Gas TH3 Series 180000 BTU Direct Vent Indoor Whole House Tankless Water Heater

- Item #: BCI2103939

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TH3 Series 180000 BTU Direct Vent Indoor Whole House Tankless Water Heater

This condensing high efficiency gas tankless water heater sets the standard in both form and function. Energy Star qualified with an energy factor of .95, a built-in temperature controller with advanced diagnositics, and a heat exchanger constructed of commercial grade copper are only a few of the features that combine to assure you never take another cold shower, or waste money while uncomfortably waiting for one. With specifications such as zero clearance venting and an outstanding output of 180,000 BTU's and up to 150 psi of water pressure, it's difficult not to appreciate every aspect of this appliance that is designed to smile back at you.

Direct Vent:The TH3SDV direct vent tankless water heater enables your system to be installed in tight spaces indoors without the worry of combustion. Coupled with an allowable PVC venting system, this condensing tankless water heater requires little space, as it draws and expels its air from outside. All of this functionality and efficiency are seamlessly controlled by a self-diagnostic computer system and controller, making it simple enough for anyone to use.


  • Capacity: 2-3 Showers (Depending on Climage)
  • Energy Star Qualified
  • Commercial-Grade Copper Primary Heat Exchanger
  • Effecient, Durable and Easy to Install
  • PVC Venting and 0 Inch Clearance
  • Complies with Lead Free Standards
  • Includes Built-in Temperature Controller and Diagnostics
  • 3 or 4 Inch Venting
  • Up to 8 Gallons Per Minute
  • Acceptable for up to 4 Showers


  • Energy Factor: .95
  • BTU: 15,000-180,000
  • Gas and Water Connections: 3/4" NPT
  • Weight: 58 Pounds
  • Dimensions: 22.5" H x 17.75" W x 10.75" D
  • Water Pressure: 15-150 PSI
  • Ignition: Electric


  • PVC Venting
  • 3" Venting up to 70 ft
  • 4" Venting up to 100 ft
  • 0" Clearance
  • Electric Ignition


  • Built-in Temperature Remote Control (Included)
  • 9007674005 or 9007671005- Pipe Cover
  • TH-NT01- Neutralizer Kit
  • 9007998005 - Wall Thimble with Hood 4"-7"
  • 9007604005 - Lead Free Isolation Valves


Additional Takagi Links

Our SKU: Takagi TH3SDV

This product is listed under the following manufacturer number(s):

  • Takagi TH3SDV-LP
    Liquid Propane
  • Takagi TH3SDV-NG
    Natural Gas

*Denotes a finish or option that has been discontinued

Takagi TH3SDV-NG Product Specifications

Specification Sheet
Installation Manual
Approved for Commercial Use Yes
Configuration Tankless Water Heater
Depth 10.75
Direct Vent Yes
Duct Size 3" Round, 4" Round
Electronic Ignition Type Yes
Energy Star Yes
Fuel Type Liquid Propane, Natural Gas
Function Condensing
Gas Connection 3/4"
Height 22.5
Ignition Type Electronic
Indoor Approved Yes
Indoor Installation Yes
LP Energy Factor .95
Liquid Propane Input (Min) 13000
Liquid Propane Manifold Pressure 4.5 WC
Liquid Propane Pressure (Min) 8.0 WC
Low Lead Compliant Yes
Maximum Gas Input 180000
Maximum Temperature 140
Maximum Vent Length 100 ft, 70 ft
Minimum Gas Input 15000
NG Energy Factor .95
Natural Gas Input (Max) 180000
Natural Gas Input (Min) 15000
Natural Gas Manifold Pressure 2.5
Natural Gas Pressure (Max) 5
Outdoor Approved No
Outdoor Installation No
Plug In No
Power Supply AC 120V
Product Weight 58
Temperature (Max) 140
Temperature (Min) 100
Voltage 120
Water Connection 3/4"
Water Pressure (Max) 150
Water Pressure (Min) 15
Width 17.75

Installation Resource Center

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