Best 3 Takagi Tankless Water Heaters: High-Quality and Reliable Performance

Takagi is a well-established tankless water heaters brand known for its commitment to producing high-quality and reliable products. Focusing on innovative technology and superior performance, Takagi has gained a strong reputation among homeowners and professionals. This introduction will explore the exceptional features and benefits that set Takagi tankless water heaters apart from the competition.

Takagi tankless water heaters are engineered to provide on-demand efficient, and endless hot water. These units offer numerous advantages by eliminating the need for a storage tank, including space-saving designs, reduced energy consumption, and lower operating costs. With Takagi’s advanced heating technology, water is heated only when needed, ensuring a constant hot water supply without the limitations of a traditional water heater.

One key aspect distinguishing Takagi tankless water heaters is their emphasis on high-quality craftsmanship and durability. Takagi takes pride in manufacturing their units with premium materials and components, resulting in products built to last. The use of quality materials not only ensures longevity but also contributes to reliable performance, even under demanding conditions.

Takagi tankless water heaters also incorporate advanced features and technologies to enhance user experience and safety. Intelligent controls allow for precise temperature adjustments, allowing users to customize their hot water preferences. Additionally, Takagi integrates safety measures such as flame sensors, overheating protection, and freeze prevention systems, providing peace of mind and safeguarding against potential hazards.

Whether you are looking to replace an old water heater or seeking a reliable solution for a new construction project, Takagi offers various models to suit different needs and requirements. From compact units designed for smaller spaces to high-capacity models for larger households or commercial applications, Takagi’s diverse lineup ensures a tankless water heater meets every demand.

Read on for all the details, or check out the reference chart below if you need more time to read the entire article.

Takagi T-H3-DV-N

Takagi T-KJr2-OS-NG

Takagi T-H3S-DV-N

"</td "</td "</td


Takagi Tankless Water Heater Installation

The first thing to consider before choosing the type of Takagi you want is the room layout for installation.

You’ll also need to decide whether to put it indoors or outdoors, but more on that later. Here are some things you need to know before installation.

If you want to know ​​the cost of installing a Takagi or any other tankless heater, read this article to understand what it entails.

Gas lines

Almost all Takagi tankless heaters require a ¾ inch gas fitting. Regarding inlet pressure, for natural gas, the range is a minimum of 4.0 inches W.C (water column) and a maximum of 10.5 inches W.C.

For liquid propane, a minimum of 8.0 inches W.C. and greater than 14.0 inches W.C.


This goes for any tankless heater, but you must be careful where you install yours.

Takagi. Make sure there is enough space to fit your Takagi. There must be at least 2 feet between the side of the appliance and the nearest wall. When it comes to ventilation, you should ensure the exhaust is not near other openings or windows. Also, ensure it is not pointed at a neighbour’s house or a pedestrian crossing.


The cost of Takagi waterless chargers varies depending on the model and where you are in the country.

Expect to pay between a few hundred dollars and over a thousand. This depends on the installation location and the required ventilation and piping. For example, you can make a hole for the hole from a solid brick, which increases the cost. Be sure to ask for a referral before doing so.

Takagi Tankless Water Heater Warranty

As with most warranties, Takagi says the warranty only covers manufacturing defects. If you damage the device during maintenance or install it incorrectly, the contract will not be honoured. If a problem or defect prevents it from working before it should, then you qualify.

Suppose you are doing the installation yourself. Or if you have a skill that Takagi doesn’t support. Any of these will void the warranty. It may be worth installing it yourself or doing it by a regular plumber because these water heaters are inexpensive. Together. For example, the T-KJr2-IN-NG costs only $500. You will save at least, or more if you install it yourself. You can save the same amount by licensing a non-Takagi boater. If you have to replace it yourself because the warranty is void, you can still save money.

This is my call, but I prefer to save money upfront because the chances of problems that can’t be fixed with the heaters without Japanese water are not high.

Takagi tankless water heater units

Every Takagi model reviewed here comes with just about everything you need to get started, but there are a few things you can buy extra.

Dissemination of Takagi

The type of ventilation you need depends on the model. You will need stainless steel air conditioners if you buy a traditional or traditional air conditioner unit.

Z-Vent Concentric Direct Vent Kit

If you are lucky enough to have your tankless heating coming from the same wall, it is installed; this cover is all you need. It will work with every 4 inches of air.

Z-Vent Concentric Direct Vent Kit
Z-Vent Concentric Direct Vent Kit

Isolation Valves

Since tankless water heaters can absorb hard water, having an easy way to clean the system is important. Otherwise, you must pay a boatman to come once a year and leave you free, costing between $100 and $200 per person.

These will pay for themselves the first time you run hot water without your tank.

iTANSO 3/4-inch IPS Isolator Tankless Water Heater
iTAN IPS Isolator Tankless Water Heater
  • [ Leakage avoidance] Hot and cold set of full port forged brass ball valves…
  • [ Lead Free Brass] Meets all federal & state standards for lead levels in…
  • [ Easy Identification and Wide Applicability ] Colored valve handles for…
  • [ Trouble-free Installation] Hi-flow hose drains (500 WOG) & pressure…
  • [ Trusted Support & Warranty] iTANSO provides a ONE-YEAR guarantee against…

Condensing Drain

If you have a condensing unit, it must be properly drained. Condensate that accumulates can be very acidic. If it is inside the device, it can damage parts, shorten the life of the device, and void the warranty.

Z-Flex 4″ Universal Appliance Adaptor
Z-Flex Universal Appliance Adaptor
  • 4″ Universal Appliance Adaptor with Back-Flow Preventer & Condensation…
  • For Takagi, Paloma, Rheem, Noritz, and Bosch AquaStar 240FX and AquaStar…
  • Useful in colder climates to prevent cold air from flowing back into your…
  • Condensation drain provides a 3/8″ drain point

Takagi vs The Competition

Everything breaks down eventually, and some are faster than they were designed to be.

But, the good thing is that Takagi has a smaller first-year warranty than other models. But it is usually in the first year that you know you have a lemon.

Japanese engineering has limitations regarding longevity and craftsmanship quality, leading to fewer issues than other brands. Regarding price, Takagi leads the way compared to other brands.

Check out Takagi T-KJr2-IN-NG. You get a good 6.6 GPM (gallons per minute) compared to the same GPM from the Noritz NR661-DV-NG. Now don’t let me. I like the Noritz, but if I were on a budget, knowing how reliable Takagi is, I would happily pay $300 less for the GPM.

Takagi tankless water heaters are ideal for all homes.

Takagi T-H3-DV-N Tankless Water Heater Review

Takagi T-H3-DV-N Indoor Tankless Water Heater


  • Endless hot water, On-demand usage, Compact, Space saving, Energy…
  • Computerized safety features, No pilot light to have to worry about
  • Safety features include freeze, overheat, surge protection, and…
  • Satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx Emissions
  • Primary heat exchanger utilizes commercial-grade copper alloy for 25 times…

Regarding reliability and performance, it takes a lot of work to beat the T-H3-DV-N Condensing Tankless Water Heater.

Using commercial grade copper for heating tubes, it is designed for high water needs and best performance. Combine that with a water flow rate of 10 gallons per minute, and you have what might be the best tankless heater for the whole house, especially considering the price. For comparison, check out the Rinnai RUC98iN. It offers the same GPM but for several hundred dollars more. And the license is 12 years against 15 for Takagi.

Flow Rate

In the best case, you can get up to 10 gallons per minute. In a typical five-person household with two adults and three children, you can use a washing machine, a dishwasher, and even a running faucet to run two water runs simultaneously. Even with a high-temperature rise rate, the power you get up to 199,000 BTU will give you enough space to take care of many appliances.

Check the temperature rise chart below to see how many GPM to expect based on your incoming water temperature. Using the calculator in the article I linked earlier, you can find your number on the chart and see if the T-H3-DV-N will meet your water needs.

If you are wondering what tankless water heater you need, the Takagi T-H3-DV-N is big enough to replace the 50-tank tank system without any reduction or temperature change.


It works well, and less heat is lost because it condenses. It’s almost impossible to get rid of. If you add water, the combustion product will cool, turn to water and come out.

Rated 95% efficient by Energy Star, you’ll see your natural gas bill drop by up to 30% per month. This adds up and shows how the tankless fire pays for itself over time.

Installation Cost

The fact that it is collapsible also reduces the installation cost because you can use cheap PVC pipes for ventilation. Since a tankless water heater does not emit heat, it does not heat the air ducts. A normal unit will require a more expensive stainless steel air conditioner.

The cost of installing Takagi will depend on where you live, where you plan to install it, and your gas and plumbing conditions in the home. A professional plumber can usually complete the installation in less than four hours. If you’re a do-it-yourselfer, you’ll need a good chunk of the day.

What We Like:

  • 10 Gallon Per Minute (GPM) water flow rate
  • Condensing for high efficiency
  • Very quiet operation
  • Safety features like surge protection, freeze control, and overheating management
  • Cascading ability to connect more than one unit
  • Energy Star rated 95% efficient
  • Great price for the GPM

What We Don’t Like:

  • Doesn’t include isolation valves for flushing


For larger families, you need help finding a more powerful unit to heat your entire home. But if, for some reason, you have a large water demand or several rooms in the house, there is an option to switch so that you can have several units connected and work independently or together to give more than 10 GPM. with one.

I recommend this to anybody with a family that loves their endless hot water.

Best Outdoor Takagi Tankless Water Heater

Takagi T-KJr2-OS-NG Water Heater Review

Takagi T-KJr2-OS-NG Water Heater
  • Outside installation only; Includes internal freeze protection
  • 19,500 – 140,000 BTU/hr
  • 0.82 energy factor
  • 6.6 GPM max flow rate

There are real benefits to having a waterless outdoor heater, but they’re even better when you don’t have to pay for one.

The low-cost Takagi KJr2-OS-NG is hundreds of dollars less than other 6.6 GPM units. Don’t you believe me? Check out the price of its closest competitor, the Rheem RTG-70DVLN-1. This costs over $200 more for the same performance. It’s a good tankless water heater, but why pay more?

Flow Rate

As I said, you will get a good 6.6 GPM at a temperature rise of 35°F. You can run two showers, a washing machine and a water heater in hot weather. Once without hot water. This number decreases as soon as you start increasing the temperature of the outgoing water and your incoming water is cold.

The best thing to do is to keep your water at the exact temperature you need and not use cold water. If you set it at 140ºF and turn it off with cold water, you will limit how much hot water you get.

The unit has a thermometer, water inlet, and outlet, so you always know what to expect for your shower and can adjust its temperature.


You also achieved a respectable 82% efficiency rating. This number may be small if you compare it indoors, but it is very good for one that will have heat loss when you are outside. This is still a high level to get you money in most parts of the country.

If you switch from a tank to a tankless water heater, expect a drop in your gas bill. How much will you save? It depends a lot, of course, but expect around 20-30% off.


You can install it yourself if you are handy as long as you don’t want to change your gas meter or anything. However, you will need gas and water lines to be ¾ inch. You must go to a plumber if you have a ½ inch gas line. Since there is no need for ventilation as it is outside, it reduces the cost and complexity of the installation.

Just read the instructions carefully because you must avoid windows and doors.

No Pilot Light

Since there is an electric ignition, there is no need to worry about a pilot light going out if it is windy and you do not have your unit with a heating box. Tankless water outside.

The only major downside is that if you lose electricity, you lose your hot water. Keep that in mind. This is generally a compromise that most people can live with, as older models that do not have external tanks often have lights that turn off and must be closed.

What We Like:

  • Great price
  • 6.6 GPM max flow rate
  • Easy installation
  • The small size will fit anywhere
  • Wired remote control
  • Self-modulating sensor saves power

What We Don’t Like:

  • Low GPM in cold climates
  • Slightly loud operation


The low price alone makes the Takagi KJr2-OS-NG worth it if you want a waterless outdoor heater.

As long as you don’t expect it to work for a large family with large water needs in the cold regions of the country, you will see the endless hot water you get. This is a great way to heat your water if you have an RV that stays in one place. They even have a propane version you can check out by clicking here.

Best Takagi Tankless Water Heater for Mid Size Homes

Takagi T-H3S-DV-N Condensing High Efficiency

Takagi T-H3S-DV-N Water Heater
  • Endless hot water, On-demand usage, Compact, Space saving, Energy…
  • Computerized safety features, No pilot light to have to worry about
  • Satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx Emissions
  • Dimension:22.5″H x 17.75″W x 10.75″D

When you have a large family and want to spend only a little money on a tankless heater that’s too big for your needs, there’s the Takagi. When I say mid-sized, you can get the throughput you need if you have a family of 6 or less.

Flow Rate

At 8 GPM, your gallons per minute at a 40°F temperature rise is higher than other models will give you for a similar temperature rise.

This will give you three showers and a shower that works simultaneously in multiple bathrooms. Since most households don’t have three bathrooms with batteries running simultaneously, you will find that you will have a lot of variation in the number of appliances running simultaneously.

Even at the low end of the spectrum, when you have high temperatures, you still get more GPM than its competitors.


Since the unit condenses, it has much less heat transfer than traditional tank water heaters and ventilation that exhausts.

This makes the energy efficiency around 90%, so it uses less gas to heat the water. Tankless water heaters often use less gas and save you more than 20% on your energy bills. Expect more than 30% and possibly more depending on the age of the tank system you are replacing. Takagi has an air flow rod to measure and adjust air consumption to maintain optimal lighting performance.


Many do-it-yourselfers can install a tankless heater themselves, but when it comes to generators, the water must be properly watered. I recommend using a professional to do this. Yes, it may be expensive, but there are savings in the Takagi.

The heating unit can use PVC ventilation because no heat comes from the air. Usually, it would be best to have stainless steel, which can be expensive, but the installation is also more involved.

PVC is cheap to buy and inexpensive to install. This saves a few hundred dollars that can be deducted from the installation price.

Long Life

Takagi’s warranty on this unit and many others are 15 years on heat exchangers. It is made of high-quality copper and built to last. This is evident from the long warranty, which means that Takagi is confident that your unit will provide uninterrupted hot water for a long time.

Safety Features

With surge protectors for electrical protection, overheat protection fuses, and freeze protection, you can be sure your tankless water heater is safe to use. It also has frost protection, so if you lose heat in your home, it won’t damage the unit. An electric motor also provides safety in case of gas leakage during operation.

What We Like:

  • Great price
  • 6.6 GPM max flow rate
  • Easy installation
  • The small size will fit anywhere
  • Wired remote control
  • Self-modulating sensor saves power

What We Don’t Like:

  • Low GPM in cold climates
  • Slightly loud operation


The price may be high, but you will get a tankless water heater that is highly efficient. Most households will get all their hot water needs from the 8 GPM you get from the Takagi. Even if you live in a cold water area, you will still get a good GPM compared to competitors.

Final Thoughts

It takes a lot of work to make when it comes to figuring out which tankless heater is best for your needs. These days, technology makes reliable, high-performance tankless heaters so cheap that all the top brands can make them. That said, I love Takagi because the price is right. They excel at such a high standard that they beat other brands in price almost every time. Spending less on Takagi means compromising on quality, reliability and longevity.

With a 15-year warranty, you know you’re safe with Takagi.