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

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Takagi TH3SDV Reviews

Rated 5 out of 5 by from Functions as expected. This unit replaced an existing 13 year old 40 gallon tank propane heater that was set up in series after a solar 80 gallon tank. Tankless is a better solution as a backup- boaster heater for solar water heating. When nature provides, the heated water just passes through the Tankless and when nature doesn't the Tankless will take over. Installation was more involved than anticipated, which seems to be the norm with any renovation. Gas lines had to be upgraded to a larger size due to greater demand. Replaced existing copper lines with black iron. I had secured a Little Giant condensate pump to deal with the condensate since the location of the Tankless was in a basement and no drain was accessible by gravity. Pump is not hook up and I'm watching the amount of condensate being generated and have a pail on the floor to catch the condensate. As to date not enough condensate is being generate to install the pump, but will continue to monitor. The outlet end of my condensate drain is a bit below the rim of the pail so if by some unlikely event if the condensate rises to the outlet the unit will shut down. I'm very happy with this Tankless and hope the unit continues to perform with the test of time.
Date published: 2014-03-11

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