T-D2-OS Outdoor Tankless Water Heater
by Takagi

The Takagi T-D2-OS Outdoor Tankless Water Heater is a dynamic unit that has enough power for up to three bathrooms, and can also handle being used in a restaurant or even a salon. If you want a tankless water heater for your light commercial use, or want a heartier tankless option for your home, we've got it! Let PlumbingSupply.com® be your tankless water heater source!
We also offer many more tankless water heaters by Takagi:
TK-310U-I (indoor) - TK-310U-E (outdoor) - TK-110U-I (indoor) - TK-110U-E (outdoor) - T-D2-IN

Takagi T-D2-OS - Tankless Gas Water Heater for Outdoor Installations

T-D2-OS outdoor tankless water heater
  • Tankless technology provides hot water when you need it, without wasting energy heating a big tank of water when you don't
  • This compact but powerful indoor installation unit is ideal for homes with three bathrooms, as well as light commercial use such as restaurants or salons
  • This unit heats water flows ranging from .75 to 10 gallons per minute, and can be linked to up to 4 other T-D2-IN units to provide up to 40 gallons per minute, depending on temperature rise
  • With dimensions of only 20.5" x 13.8" x 8.5", this hot water heater can be installed nearly anywhere, often allowing for installation far closer to the main point of use than traditional tank-type heaters, which reduces travel-time through pipes and wastes less energy
  • The T-D2-OS does not require any additional venting or vent caps, making installation one step easier for installers, which can save you time and money
  • Computer-controlled burners use only the amount of gas required according to the demand, which significantly increases this unit's efficiency and can decrease your gas bill
  • Includes TM-RE30 Temperature Remote Control, which allows the default factory setting of 122°F output temperature from the water heater to be adjusted within the range of 99°F to 185°F, and it also works as a diagnostic tool that will give a concise error code whenever there is a problem with the unit
  • A minimum flow rate of only .75 GPM activates the burner, further ensuring hot water is only heated when needed, and not wasted by a drippy faucet
  • View more detailed specifications
  • View flow rate and pressure loss information
  • Looking to install this tankless water heater inside? Click here
Takagi T-D2-OS Outdoor Tankless Water Heater with Remote Controller
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Please note: Some areas do not allow installation of a few of these water heaters. Read more

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Frequently Asked Questions

Q. "If these units don't have a tank, how do they know when to turn on?"
A. These tankless water heaters have a flow switch built into them. When you turn on the hot side of a faucet the water begins moving. Once the water is traveling at minimum flow rate for the heater, the flow switch will turn on the gas.

Q. "I've heard that some Takagi tankless water heaters cannot be installed in a few areas. Is that true?"
A. Yes, there are some counties that do not allow for the installation of a few Takagi tankless water heaters. For this reason, the person purchasing one of the following models is responsible for checking with their local code authorities prior to ordering: T-M32-NG, T-D2-IN-NG, T-D2-OS-NG, T-K4-IN-NG, T-K4-OS-NG, T-KJr-IN-NG, T-KJr-OS-NG. Here's a list (not complete) of some California counties that do not allow these water heaters to be installed: Sacramento, Yolo, Sonoma, San Joaquin, Napa, Marin, Solano, Contra Costa, San Francisco, San Mateo, Alameda, and Santa Clara. Again, this list is not complete, so it's up to the purchaser to check with local code authorities prior to ordering.

Q. "Why can't I install the T-D2-OS myself?"
A. Improper installation of the T-D2-OS could create carbon monoxide gas and other dangerous gases. Installation of this unit by persons other than professionally trained technicians voids the warranty.

Q. "What's the first hour rating of this water heater?"
A. Traditional tank water heaters have a first hour rating which is determined by the amount of hot water the heater can produce in an hour when starting with a full tank of hot water. As tankless water heaters do not start with a tank of hot water, they don't really have a first hour rating the same way a tank water heater does. Instead, tankless water heaters have a gallons per hour rating, which is determined by how many gallons per hour the tankless water heater can produce when raising the incoming water temperature a specified amount.

Q. "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.

Q. "It sometimes drops below freezing where I live. Can I still install a Takagi tankless water heater outside?"
A. Takagi gas tankless water heaters are designed to be installed outdoors only in mild temperate climates. The factory-installed freeze protection device is rated for temperatures down to 5°F in a wind-free environment, so wind-chill factors must be taken into account when choosing whether or not to install a Takagi tankless water heater outdoors. If you are unsure if temperatures at your planned installation would work for an outdoor tankless water heater, we strongly recommend consulting with a trusted local professional.

Q. "What do I need to install these Takagi tankless water heaters outdoors?
A. Outdoor-only Takagi tankless water heaters, such as the T-D2-OS, the TK-310U-E or the TK-110U-E, require no additional venting components. Units that can be installed either indoors or outdoors, are designed to need only the addition of an outdoor vent cap or properly vented recess box in order to function in an outdoor installation. Please note that Takagi tankless water heaters, like most brands of water heaters, are designed to be installed outdoors only in mild temperate climates. As always, please consult with your installer or another trusted professional before installation.

All Takagi tankless water heaters must be installed by a licensed professional.

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