AO Smith is one of the most recognized names in home water heating, and the company actually owns a much larger slice of the water heater market than most homeowners realize.
Beyond its own flagship brand, AO Smith owns several other water heater names sold at different price points, which is worth knowing before assuming two competing brands at the hardware store are truly independent companies.
Here is exactly where AO Smith water heaters are manufactured, how the company built its market position, and what real owners say about long term reliability.
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Who Really Makes AO Smith Water Heaters
A O Smith Corporation is a publicly traded American manufacturer headquartered in Milwaukee, Wisconsin, and it is one of the largest water heater manufacturers in the world by volume.
The Wikipedia entry for A O Smith documents the company origins in steel manufacturing before it grew into a dominant water heating and water treatment business.
AO Smith Manufacturing Locations
The company largest water heater factory sits in Ashland City, Tennessee, described by AO Smith as the largest water heater manufacturing facility in the world, and it anchors five North American manufacturing plants for the brand.
AO Smith also operates international manufacturing plants in Nanjing, China, Veldhoven in the Netherlands, and Bengaluru, India, giving the company a genuinely global production footprint beyond its United States operations.
The AO Smith Family Of Water Heater Brands
AO Smith owns several additional water heater brands sold at different price tiers and through different retail channels, including State, American, Reliance, and GSW in Canada, all manufactured using shared engineering and, in many cases, the same production facilities.
This means two water heaters sitting side by side at a home improvement store under different brand names may come off very similar production lines, with the biggest differences coming down to features, warranty length, and retail positioning rather than fundamentally different manufacturing quality.
What Owners Say About AO Smith In Trustpilot And Reviews
AO Smith carries a modest volume of reviews on Trustpilot, and 2026 feedback paints a mixed picture, with several customers reporting long wait times for customer support and frustration getting product guidance, while others report years of trouble free service from tank style models.
Specific complaints in 2026 reviews include premature failures on certain electric on demand models, while broader sentiment across water heater review sites tends to credit AO Smith tank style units with strong hot water recovery and dependable steady flow performance.
AO Smith Warranty And Customer Support
AO Smith backs its water heaters with tiered limited warranties that vary by model, and homeowners can verify specific coverage terms using the serial number lookup tool on the official AO Smith warranty verification page.
For warranty or service questions, AO Smith customer support can be reached through the contact page on hotwater.com, or by phone at 1 800 527 1953 for residential water heater support.
How AO Smith Compares To Other Water Heater Brands
AO Smith biggest competitor is Rheem, and buyers comparing the two companies can read our guide to where Rheem water heaters are made alongside our breakdown of Rheem air conditioners for context on the other major player in home water heating.
Within its own brand family, AO Smith positions itself as the premium tier option compared to its own State, American, and Reliance sister brands, which are generally priced lower for budget conscious buyers.
Is AO Smith Really Good
AO Smith holds a strong overall reputation in the water heater industry, backed by genuine manufacturing scale and one of the largest dedicated water heater factories in the world.
Customer service response times appear to be the most consistent complaint in recent reviews, so buyers who value fast support may want to weigh that alongside the generally solid product performance record.
Frequently Asked Questions About AO Smith Water Heaters
Where are AO Smith water heaters manufactured
Most AO Smith water heaters sold in North America are built at the company flagship plant in Ashland City, Tennessee, with additional global production in China, India, and the Netherlands.
Does AO Smith own other water heater brands
Yes, AO Smith owns State, American, Reliance, and GSW in Canada, all built using shared engineering and often the same manufacturing facilities as the AO Smith flagship brand.
Is AO Smith a good water heater brand
AO Smith is generally regarded as a solid, dependable water heater brand with strong manufacturing scale, though some recent reviews note slower customer service response times.
How long do AO Smith water heaters typically last
AO Smith tank style water heaters commonly last 8 to 12 years with proper maintenance, though actual lifespan varies by model, water quality, and usage.
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.