Takagi Water Heaters Review and Buying Tips

Takagi T-H3 tankless water heaterTakagi T-H3 tankless water heater

A review of Takagi water heaters with tankless, on-demand technology. See how advanced condensing design and cutting-edge technology can save you money and energy and deliver reliable and worry-free water heating.

As the first tankless unit that entered the North American market, Takagi still offers a respectable selection of heaters for residential use, such as the popular and top-selling T-H3 model. Explore Takagi tankless top features and best models to buy for home use.

Takagi water heaters: Buying tips

Takagi water heater manufacturer offers various gas-fired tankless models for residential and commercial applications, from small offices, apartments, and condos to large homes with multiple baths.

There are two main groups; non-condensing models with the lower efficiency (energy factor is around 0.82) and cost, and condensing, with the superior energy efficiency (energy factor is over 0.90), but higher prices.

All Takagi tankless models continually deliver hot water at the precise temperature and steady flow, as long as there is a demand. In addition, the tankless and condensing technology ensures the most energy-efficient water heating, saving you money and conserving energy. That is why choosing the model with the highest energy factor, such as the T-H3-DV as your best choice.

Another great advantage of the tankless heaters is the compact size and wall-mounted design, which allows them to occupy much less space than the conventional tank type.

Top Takagi models sold online

Where to find and buy the most-wanted Takagi water heaters?

Here is the list of the best-selling models from Takagi, found online, and it includes state-of-the-art features, amazing specs, and many positive reviews:

The price range of Takagi water heaters is between $600 for the basic models to over 2000 for models with the most innovative technology. The installation cost varies.

 Advantages and benefits

Takagi water heaters are ideal for homeowners looking to buy an efficient, reliable, and versatile unit, from potable water and space heating to recirculation systems.

From the smallest model T-KJr to the largest T-M50, you will find models with high energy efficiency, are environment-friendly or "green," use less energy, meet or exceed the Low NOx standards SCAQMD, and preserve natural resources by using 95% recyclable materials.

Like other tankless appliances, Takagi water heaters provide on-demand and an endless supply of hot water, and with the sophisticated features allow the steady hot water flow with less fluctuation. All units use different features to protect the unit, like flame sensor, air control, hi-limit switch, thermistors, overheat sensor, and multiple ceramic heaters to prevent freezing when the surrounding temperature drops too low.

Takagi uses a small computer for the proper unit operation, maximized efficiency, and reduced greenhouse gas emissions. This computer monitors and adjusts the air/fuel ratio and, therefore, the quality of the gas combustion. The LED error code is used for troubleshooting.

Takagi manufacturer is the only manufacturer that offers direct vent convertible units.

Best advanced models to buy

One of the best Takagi water heaters is the T-H3-DV model.

The Takagi T-H3-DV model is the ultra-efficient and Energy Star unit that utilizes tankless and condensing technology, strong and reliable elements such as quality heat exchangers, made of durable stainless steel, and commercial-grade copper alloy.

An innovative design makes it ideal for home recirculation and high volume applications; also commercial sites due to the NSF Certified Food Equipment certification and ability to achieve a high temperature of 185 F.

The Takagi T-H3-DV unit is a popular model among homeowners as it comes with the highest power output of 199,000 BTU, an extra high energy factor of 0.95, and a water flow of 10 GPM. These features make T-H3 ideal for large homes with 4-5 baths or even more demanding applications when using the Easy-Link and Multi-Link features.

Another great model is TK-199X3P, the latest development in tankless water heating from Takagi, which is offered as a natural and propane gas type. What makes it unique is that it combines the tankless, condensing, recirculation, and scale prevention technology to deliver the highest performance, cost less to operate, and last three times longer than other brands.

This condensing model is a fully modulating gas-fired heater that can modulate the power from as low as 9,000 BTU to high 199,000 BTU and deliver up to 10 GPM of hot water. When using the recirculation system, it can deliver hot water faster and with the least energy losses.

It is equipped with two stainless steel heat exchangers and a temperature controller to make it convenient for users to change and control the temperature, check the history of problems or status.

Top affordable models to buy

Models T-K-110 and T-H3M are the smallest tankless water heaters from Takagi. These are designed for light residential applications such as small homes, apartments, or condos, and are used for 1-2 applications.

Takagi T-H3M models are designed for indoor and outdoor use to operate as a single Energy Star unit that meets ultra-low NOx gas emission standards, making it great for environmentally conscious users.

It can be used as a single unit or combined with the conventional tank-type, also used in recirculation systems, radiant floor, and hydronic heating systems.

The Takagi TK-110 series is another group of standard tankless water heaters, which is available only as the indoor non-condensing type. It can also be used with storage tanks and other systems for combined domestic and heating applications.

Model review

The smallest Takagi water heaters recommended for 1-2-bath homes (or 1-2 showers) can provide the maximum power between 120,000 and 160,000 BTU and flow rate up to 8 GPM. These are as follows:

  • TK-160X3P
  • TK-110C and TK-110U
  • T-H3J-DV and T-H3J-OS
  • T-H3M-DV and T-H3M-OS

Takagi water heaters recommended for 2-3-bath homes (or 2-3 showers) can provide the maximum power between 180,000 and 190,000 BTU and deliver hot water with a flow rate of up to 8 GPM. These are:

  • TK-180X3P
  • TK-310C and TK-310U
  • T-H3S-DV and T-H3S-OS

The largest Takagi water heaters used for 4-bath homes (or 4 showers) can provide the maximum power of around 199,000 BTU and flow rate up to 10 GPM.

  • TK-199X3P
  • TK-510 C and TK-510U
  • TK-540P
  • T-H3-DV and T-H3-OS
UEF 0.81 0.82 0.81 0.93-0.95
Condensing No No No Yes
Energy Star No No No Yes
Water flow
6.6 8 10 10
Recirculation No No No Yes
Easy-Link No No Yes Yes
Ultra-Low Nox Yes Yes Yes Yes
15 15 15 15

T-H3J T-H3 T-H3S T-H3M
UEF 0.94-0.95 0.93-0.95 0.94-0.95 0.9-0.91
Condensing Yes Yes Yes Yes
Energy Star Yes Yes Yes Yes
Water flow
6.6 10 8 6.6
Recirculation No No No No
Easy-Link No Yes No No
Ultra-Low Nox Yes Yes Yes Yes
15 15 15 15

About Takagi

Takagi Industrial Co. is a reputable manufacturer from Japan, designing and producing tankless water heaters since 1952.

Since then, Takagi manufacturer has constantly been introducing amazing features and models, including the automatic gas control valve system, computer modulating gas valve, and safety system. Also, the "direct vent convertible" heater, a unique safety device that utilizes the air-fuel ratio rod, excellent 95% thermal efficiency rating (T-H1 model), T-M1 as the first multi-gas water heater system for industrial applications, and much more.

Today, the Takagi water heater manufacturer has offices in Japan, the US, and Canada, and to buy one of the Takagi models; you have to contact an exclusive dealer or buy online.


Every Takagi water heater used in residential applications has a warranty of 15 years on the heat exchanger and five years on all other parts. Warranty on commercial use is "only" 10 years.

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