Takagi T-D2-OS-NG Outdoor Tankless Water Heater Review

Product Name:T-D2-OS-NG Outdoor Tankless Water Heater Natural Gas
Power Source:Natural Gas
Use Type:Ourdoor
Capacity:10 GPM
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The Quick Review

Like Takagi’s indoor models, the T-D2-OS-NG Outdoor tankless water heater provides the industry leading flow rates at extremely affordable prices. With a whopping 10 GPM flow rate and great online reviews, those who want the best bang for their buck should take a close look at this Takagi model. With 82% efficiency and internal freeze protection to a low of -30C, this outdoor tankless water heater will meet the needs of the majority of homes.


With an industry leading 10 GPM flow rate, you will be able to heat up to 3 large outputs or 4 small outputs. Some examples might be: 3 showers; 2 showers and a dishwasher, 1 shower, a washing machine, two bathroom sinks. Basically, any need the average home would ever need at their maximum!


Since this tankless water heater requires a gas line hook up, you will require professional installation. We do not recommend an amateur attempt to install this unit as working with gas lines can be very dangerous. That said, for a professional, this installation is quite straight forward and shouldn’t run up a large labor bill. Many individuals on Amazon has reported that they were able to install it themselves with ease.


This is truly the best value you can have in the market in terms of flow rate for price. That said, Takagi is a slightly lesser known brand than names like Rheem or Rinnai, but according to thousands of online reviews, their products hold up for the long run. We think there is great value in this outdoor tankless heater!

The Misses

Most tankless water heaters take a while for the water to heat up when you turn on the faucets, and this unit is no exception. It can take up to 15 seconds (in the winter) for the water to heat up, which is slower than conventional electric water tanks. For a unit of this quality, we would expect them to innovate in this area.

The unit produces more noise than is to be expected as well, but since this an outdoor heater, this shouldn’t be much of a concern.

Our Recommendation

We definitely recommend this product for any house with up to 3 bathrooms and large appliances and want the absolute highest flow rate available on the market. Be sure to check the price to see if a discount is available today.

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