Rinnai practically invented the modern tankless water heater category for American homeowners, and the brand still leads in mindshare whenever someone starts researching endless hot water.
For years, that meant every Rinnai unit sold in the United States actually came from Japan, but that changed relatively recently with a major domestic manufacturing investment.
Here is exactly where Rinnai water heaters are made today, what changed, and what current owners think of the performance.
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Who Really Makes Rinnai Water Heaters
Rinnai America Corporation is a subsidiary of Rinnai Corporation, headquartered in Nagoya, Japan, and it has been the dominant name in tankless water heating for decades.
The Wikipedia entry for Rinnai documents the company origins in Japan and its expansion into more than 20 overseas subsidiaries and manufacturing operations globally.
Rinnai Manufacturing Locations
Rinnai opened its first United States manufacturing facility in Griffin, Georgia, a 300000 square foot plant that began domestic production of the RE Series tankless water heaters in 2018, marking, according to Rinnai official announcement, the first unit ever manufactured in North America.
Before that Georgia expansion, all Rinnai tankless water heaters sold in the United States were imported from Japan, and the parent company remains headquartered there even as domestic production has grown.
Why Rinnai Built A Factory In Georgia
Rinnai decision to build in Griffin, Georgia was driven largely by rising American demand for tankless water heaters and a desire to reduce shipping costs and lead times compared to importing every unit from Japan.
The Georgia plant has continued expanding production capacity since opening, reflecting how much the tankless water heater category has grown in the United States over the past decade.
What Owners Say About Rinnai In Trustpilot And Reviews
2026 Trustpilot reviews for Rinnai show a genuinely mixed picture, with some homeowners reporting years of trouble free tankless performance while others describe persistent temperature fluctuation issues, including one review specifically warning to avoid the brand after ongoing problems.
The most common specific complaint in recent reviews involves inconsistent water temperature during use, while positive reviews frequently single out specific models like the RX199iN for steady output and quiet operation.
Rinnai Warranty And Customer Support
Rinnai backs its tankless water heaters with a limited warranty that varies by series, and full terms along with product registration are available on the official Rinnai warranty page.
For warranty service, homeowners can call Rinnai directly at 1 800 621 9419, and proof of purchase or product registration within 30 days of purchase is required to activate coverage.
How Rinnai Compares To Other Water Heater Brands
Buyers comparing tankless options can read our guide to where Navien water heaters are made, Rinnai closest direct tankless competitor, or check our breakdown of AO Smith water heaters for the tank style alternative.
Rinnai and Navien remain the two most discussed tankless brands among plumbing professionals, and the choice often comes down to specific installation requirements and local dealer support rather than a clear overall winner.
Is Rinnai Really Good
Rinnai remains one of the most trusted names in tankless water heating, backed by decades of engineering experience and a growing domestic manufacturing presence in Georgia.
Temperature consistency complaints in recent reviews are worth taking seriously, so buyers should ensure proper installation and sizing for their household hot water demand to avoid the issues some reviewers describe.
Frequently Asked Questions About Rinnai Water Heaters
Are Rinnai water heaters made in the USA
Some Rinnai tankless water heaters are now manufactured at the company Griffin, Georgia plant, which opened in 2018, though the parent company remains headquartered in Nagoya, Japan.
Is Rinnai a Japanese company
Yes, Rinnai Corporation is headquartered in Nagoya, Japan, and Rinnai America Corporation operates as its United States subsidiary.
Is Rinnai a reliable tankless water heater brand
Rinnai is generally well regarded, though 2026 owner reviews show mixed experiences with temperature consistency, so proper installation and correct unit sizing matter significantly.
How long do Rinnai tankless water heaters typically last
Rinnai tankless water heaters commonly last 15 to 20 years with proper maintenance, significantly longer than a typical tank style water heater.
I am Jack Neel, a mechanical engineer, researcher, and writer. I created this website to share my knowledge about different brands and products with you. I research the manufacturers behind the brands and provide you with the information you need to make smart buying decisions.