Takagi Water Heaters

Everything you need on Takagi Water Heaters, including model details, industry rankings and customer reviews, all in one place.

Takagi Water Heater Overview

Takagi manufactures a wide range of residential and commercial tankless water heaters and accessories. They are headquartered in Irvine, California, with regional offices in Tennessee and New Jersey, and a global office in Canada. A.O. Smith acquired all of Takagi USA’s assets in 2010. A.O. Smith Corporation had sales of approximately $3 billion in 2017.

What are the 10 Best Water Heaters?

Consumer Reviews of Takagi


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #17 of 51 Water Heaters
  • 28.57% of customers recommended

Corporate History

The Japanese company was founded in 1952 and entered the American market with the opening of its Tustin, California operations in 1995. Some of the “firsts” claimed by the company include: bringing tankless-only products to the North American market; offering a tankless product with an efficiency rating of up to 95%; and offering direct-vent convertible tankless model of water heater. The company entered into a joint venture with A.O. Smith in 2010 in which A.O. Smith acquired all of Takagi USA’s assets and assumed responsibility for the Takagi brand.

Product Lines

Takagi tankless units provide between 200 and 500 gallons of hot water per hour, depending on the model, and 34 models are Energy Star rated. Ten units are capable of a maximum flow rate of 10 gallons per minute, and four models feature a maximum flow rate of 14.5 gallons per minute. The Tagagi line includes both indoor and outdoor units which can run on natural gas or propane.


Takagi provides a 15-year heat exchanger 5-year parts warranty on residential models. On commercial models they provide a 10-year heat exchanger and 5-year parts warranty.

Find a Certified Heating & Cooling Professional In Your Area

Contact a top-rated local expert to help with all of your home's HVAC needs.

Takagi Water Heater Reviews

Showing 1-5 of 14 reviews

"No warranty"

1.0 rating
Very Unsatisfied

Worst warranty response ever My heat exchanger went out in about 4.5 years still covered by the warranty. After having my local plumber spend a couple of hours taking it apart and taking pictures they denied my claim, they said my core was 'stressed' from overuse. The strange thing is the unit was in a home that we use only about 50 percent of the time and has only 2 baths. We bought a unit that was a commercial unit built for a 4 bathroom house. Way over-designed for its use and yet it was stressed. Also they no longer Cary parts for that model. Seems like a sham to me. Their only advice was to buy a new one and I will but certainly not there' S.

Robert markwith


"Outstanding Technical support"

5.0 rating
Very Satisfied

I have used Takagi support for the past 2 years. They are very professional and extremely helpful for the 2 units we purchased. Recently, I had an issue I was hoping to get some help before I called a plumber at $100. an hour. They came to my rescue by advising me to change a switch setting on our tenants unit. I was overjoyed that it worked and I am very thankful that is saved me a few hundred dollars.

Richard Mangone

Boston, MA

"Waste of money, poorly built, abysmal customer service, won't honor warranty"

1.0 rating
Very Unsatisfied

My professionally installed Tagagi in a new house lasted only 8 months until heat exchanger started leaking. Called customer service after waiting 1/2 hour on phone and they gave me name of 'approved' plumber to fix it as it was under warranty. Plumber came and spent 4 hrs at $130/hr disassembling, taking photos to send to customer service, including waiting 1.5 hrs on his phone waiting to talk to them several times and reassembly because they didn't get back to him until the next day with an offer to send an $800 heat exchanger but only offered to pay plumber 2 hrs of labor at $80/hr to do the repair. Plumber estimates it will take him minimum of 6 hrs to fix it. So I am stuck with paying almost $1,000 in labor to fix the Tagagi that is under full warranty because they are so cheap. I refused and will take out the unit and install another brand from Home Depot that offers an additional 5 year warranty through them and sue Tagagi in small claims court for failure to honor their warranty. In today's digital information age where it is impossible to hide bad behavior this company is clueless and stupid. Do not buy tagagi products you will regret it.

P Mattingly


"Do not buy a Takagi tankless water heater"

1.0 rating
Very Unsatisfied

I have had to install additional filters, remote control and have had numerous expensive plumber calls; the water heater quits heating unpredictably. I am in the process of installing a regular water heater to remedy this Takagi disaster. I contacted the company and they said that it was my prerogative to replace their water heater; no offer for even a partial reimbursement to back up their product. Will never purchase a Takagi product of any kind ever again.

J Davila

McAllen, TX

"Won't buy again"

1.0 rating
Very Unsatisfied

First Takagi failed within 7 years, was told that it would be less expensive to get a new one. This new one lasted 2 1/2 years before 'error code 771' and subsequent repair costs were needed. I will never recommend this product or company to anyone.


Los Angeles, CA

HVAC Brands

Learn more about your home's heating and cooling system with our guides, how-to's, FAQ's, tips and more.

Trane American Standard Lennox Carrier Goodman

Ready to get a quote from an HVAC contractor?

Let us know what type of service you need and we can connect you with a certified local HVAC contractor.

Please enter a valid name

Please enter a valid phone number

Please enter a valid zip code

There are no dealers in this zip code.

Please enter a valid email address

Please select repair or replace

Please select heating, cooling or both