If you are shopping for a new water heater, you have likely encountered the name A.O. Smith. As one of the oldest and most recognizable brands in the United States, they are a staple in many basements and utility closets.
But longevity does not always equal quality. Is A.O. Smith still a top contender in the 21st century? Or have they rested on their laurels?
To help you decide, we researched their current catalog and analyzed real user feedback. Below, we break down the brand’s best options, from high-efficiency hybrids to durable gas tanks, so you can find the perfect fit for your home.
- Energy-saving
- User-friendly digital display
- Heavy-duty anode rod & heating elements
- Commercial-grade copper alloy
- NOx regulation complaint
- Freeze & overheat protection
- Features a hot-surface igniter
- Glass-lined tank
- Internal dip-tube feature
Why Choose an A.O. Smith Water Heater?
A.O. Smith stands out because they make the buying process accessible. They don’t just sell units; they provide extensive tools and resources to help homeowners identify exactly what they need based on usage and location.
Whether you need a massive commercial unit or a compact residential heater, their catalog is vast. They cover every fuel type and configuration, meaning you do not have to settle for a “good enough” solution. You can find the exact match for your plumbing setup.
Which A.O. Smith Water Heater Should You Choose?
Gas and Propane Models
The ProLine series is the company’s bread and butter. These units are ideal for large families or homes in colder climates where inlet water temperatures drop significantly. A.O. Smith also manufactures specific models designed for a mobile home.
These tanks are workhorses. They boast a high recovery rate, often delivering a first-hour rating of 79 gallons. Efficiency is solid, with many models hitting a uniform energy factor (UEF) of 0.70 or higher.
The trade-off is technology. The standard ProLine units are mechanical and straightforward. You generally won’t find Wi-Fi connectivity or smart home integration here, but for many, simplicity is a plus.
Tankless Units
If you want to save space, A.O. Smith offers two main categories of tankless heaters: gas/propane and hybrid configurations. Currently, the gas/propane models are the clear favorites among homeowners.
Most of these units are Energy Star certified and feature Ultra-Low NOx emissions. They use condensing technology to squeeze every bit of heat out of the fuel, making them highly efficient.
With the right sizing, these units provide endless hot water. They are powerful enough to support a home with three bathrooms, provided you calculate your flow rate requirements correctly.
Hybrid Heat Pumps
The Voltex line represents A.O. Smith’s entry into hybrid water heaters. These smart units blend standard electric heating elements with heat pump technology.
Efficiency is the main selling point here. By pulling heat from the surrounding air to warm the water, Voltex models can drastically lower utility bills. They are Energy Star certified and often qualify for local rebates.
A secondary benefit is dehumidification. As the heat pump operates, it draws moisture out of the air, making it a great choice for damp basements or garages. However, they require more physical space for airflow and can be noisier than a standard electric tank.
Product Reviews
Since A.O. Smith is an industry titan, finding products was easy. The challenge was filtering through hundreds of models to find the ones that offer the best value and reliability. After extensive comparison, here are our top picks for the best A.O. Smith water heaters:
A.O. Smith Voltex® Hybrid Electric Heat Pump Water Heater
Best A.O. Smith Hybrid Water Heater
If cutting monthly utility bills is your priority, the Voltex 80-gallon hybrid is the strongest contender. This unit pays for itself over time by utilizing heat pump technology rather than relying solely on expensive heating elements.
According to A.O. Smith, this model can reduce water heating costs by up to 71% compared to a standard electric heater. It creates hot water by absorbing heat from the ambient air, which has the added side effect of cooling and dehumidifying the room it sits in.
The Voltex is also the smartest heater on this list. It features four distinct operating modes:
- Hybrid Mode: Balances efficiency and recovery speed.
- Efficiency Mode: Uses only the heat pump for maximum savings.
- Electric Mode: Operates like a standard heater (least efficient but fastest recovery).
- Vacation Mode: Keeps the tank lukewarm to save energy while you are away.
A user-friendly digital display lets you monitor tank status and adjust temperatures easily. Inside, a heavy-duty anode rod provides robust protection against corrosion, with a reported lifespan of up to six years before needing a check.
Pros
- Massive energy savings compared to standard electric tanks.
- Four distinct operating modes for flexibility.
- Integrated dehumidification helps dry out damp basements.
- Digital interface acts as a diagnostic tool.
Cons
- Heat pump creates fan noise during operation.
- Recovery time is slower in “Efficiency” mode during cold weather.
Product Specs
| Uniform Energy Factor | 3.45 |
| Recovery rate | Not specified |
| Measurements | 69 inches by 27 inches by 27 inches |
| Energy Star Rated | Yes |
| Warranty | 6-year limited warranty on tank and parts |
Our Ratings
A.O. Smith ATI-540H-N Tankless NG Water Heater
Best A.O. Smith Tankless Water Heater
For larger households that run out of hot water during the morning rush, the ATI-540H-N tankless model is a problem solver. It eliminates the bulky tank entirely, freeing up floor space while providing a continuous supply of hot water.
Durability is a key feature here. The primary heat exchanger is built from commercial-grade copper alloy, which resists heat stress better than standard stainless steel in some applications. With a max input of 199,000 BTU, it can easily supply three to four bathrooms simultaneously in warmer climates.
It achieves a 0.93 Uniform Energy Factor (UEF) by using condensing technology. This captures hot exhaust gases to preheat incoming water, ensuring minimal waste.
Safety and maintenance are also streamlined. The unit includes built-in freeze protection and an overheat cutoff. If something goes wrong, the remote controller displays troubleshooting codes so you know exactly what to fix.
Pros
- Commercial-grade copper heat exchanger improves longevity.
- High 0.93 UEF rating lowers gas usage.
- Compact design mounts on the wall to save floor space.
- Capable of linking with other units for massive demand.
Cons
- Requires a minimum flow rate to activate, which can be tricky with low-flow faucets.
- Installation is more complex and expensive than a standard tank.
Product Specs
| Uniform Energy Factor | 0.93 |
| Recovery rate | 10 gallons per minute |
| Measurements | 23.625 inches by 17.75 inches by 11.25 inches |
| Energy Star Rated | Yes |
| Warranty | 15-year heat exchanger warranty and five years on parts |
Our Ratings
A.O. Smith GPVL-50 ProMax Power Vent Gas
Best A.O. Smith Gas Water Heater
The GPVL-50 ProMax is a solid choice for homeowners who want a traditional tank but need flexible venting options. As a power vent model, it pushes exhaust out horizontally, giving you more freedom regarding where you install the unit.
A standout feature is the internal dip tube design. It forces incoming cold water to the bottom of the tank, creating turbulence that helps prevent sediment buildup. This maximizes hot water output and keeps the heating transfer efficient over the years.
Reliability gets a boost from the hot-surface igniter. Unlike a traditional standing pilot light that wastes gas and blows out often, this electronic ignition is robust and consistent. The tank is protected by A.O. Smith’s signature glass lining and insulated with 2-inch thick foam to keep the heat trapped where it belongs.
Pros
- Power venting allows for flexible installation locations.
- Self-cleaning dip tube reduces sediment buildup.
- Glass-lined tank resists corrosion effectively.
Cons
- Requires a nearby electrical outlet for the blower and igniter.
- taller profile may not fit in short basements or crawl spaces.
Product Specs
| Uniform Energy Factor | 0.72 |
| Recovery rate | 79 gallons per hour |
| Measurements | 60.1 inches by 24 inches by 24 inches |
| Energy Star Rated | Yes |
| Warranty | Six-year limited warranty on tank and parts |
Our Ratings
| Product | Award | Uniform Energy Factor | Recovery rate | Measurements | Energy Star Rated | Warranty |
|---|---|---|---|---|---|---|
| Voltex® Hybrid | Hybrid | 3.45 | N/A | 69″ x 27″ x 27″ | Yes | 6-year (limited) |
| ATI-540H-N | Tankless | 0.93 | 60 gal/hr | 23.625″ x 17.75″ x 11.25″ | Yes | 15-year (heat exchanger); 5 years (parts) |
| GPVL-50 ProMax | Gas | 0.72 | 79 gal/hr | 60.1″ x 24″ x 24″ | Yes | 6-year (limited) |
The History and Legacy of A.O. Smith
A.O. Smith is not just a water heater manufacturer; it is a piece of American industrial history. Founded by Charles Jeremiah Smith in 1874, the company originally started making baby carriages and bicycle parts. By the turn of the century, they were the largest bicycle part manufacturer in North America (1).
Their engineering prowess evolved rapidly. From creating the first pressed steel vehicle frames for companies like Ford and Cadillac to producing bomb casings and landing gear during World War II, A.O. Smith has always focused on metalworking and mass production.
Pioneering Water Heating
The shift to water heaters began in earnest after WWII. A.O. Smith acquired the Burkay Company and soon introduced the glass-lined commercial water heater, a standard that defines the industry today. This glass coating prevents steel tanks from rusting, significantly extending the life of the unit.
Through the decades, they expanded globally, opening plants in Canada, Europe, and eventually China and India. Major acquisitions, such as State Industries in 2001 and the American Water Heater Company in 2006, cemented their status as a market leader.
Today, A.O. Smith focuses heavily on water technology. Their modern headquarters in Milwaukee houses the L.R. Smith Corporate Technology Center, where engineers develop the next generation of hybrid and tankless systems (2).
Where to Buy A.O. Smith Water Heaters
You can purchase A.O. Smith units through several major channels. Their full residential lineup is available at Lowe’s, which is their primary big-box retail partner. You can also find specific models and parts on Amazon or through professional plumbing supply houses like SupplyHouse.com.
A.O. Smith Customer Service
Support is generally accessible via the official website. You can download manuals, look up warranty information, or use their Product Selector Tool to find the right model size.
In terms of reputation, customer experiences are mixed but generally positive regarding hardware quality. While some users report issues with electronic components on newer high-tech models, the company is known for honoring warranties.
FAQs
Where Are A.O. Smith Water Heaters Made?
A.O. Smith is a global company, but its heart remains in the USA. The company’s largest water heater manufacturing plant is located in Ashland City, Tennessee. They operate five facilities across the United States, along with additional manufacturing plants in China, India, Mexico, and the Netherlands.
Are A.O. Smith Water Heater Glass Lined?
Yes. A.O. Smith pioneered the glass-lined tank over 80 years ago. This process involves fusing a specialized glass coating to the interior steel surface of the tank at high temperatures. This creates a durable barrier that prevents water from corroding the steel, effectively stopping rust and extending the tank’s lifespan.
Are A.O. Smith Water Heaters Self-cleaning?
Many A.O. Smith residential models feature a “self-cleaning” dip tube (often branded as DynaClean). This tube creates turbulence at the bottom of the tank to stir up sediment, preventing it from hardening into scale. While this helps maintain efficiency, it does not replace the need for occasional tank flushing, especially in areas with hard water.
Is A.O. Smith a Good Brand of Water Heaters?
Yes, A.O. Smith is widely considered a top-tier brand in the water heating industry. They are known for reliability, wide availability of parts, and a massive range of options. While no brand is immune to occasional defects, their glass-lined tanks and innovative hybrid technology keep them competitive with brands like Rheem and Bradford White.
How Long Does an A.O. Smith Water Heater Last?
A standard A.O. Smith tank water heater typically lasts between 8 and 12 years. Tankless models can last significantly longer, often reaching 20 years with proper maintenance. Regular maintenance, such as checking the anode rod and flushing the tank, is the best way to maximize lifespan.
How Long is A.O. Smith Warranty?
Residential warranties usually range from 6 to 10 years, depending on the specific model tier (e.g., ProLine vs. ProLine Master). Some premium or commercial models may offer up to 12 years. Always check the specific rating plate on your unit, as warranties can vary based on installation and model.
Are A.O. Smith Water Heaters Better than Rheem?
Both brands are excellent, and the “better” option often comes down to availability and specific features. Rheem is often praised for its smart home integration (EcoNet) and is readily available at Home Depot. A.O. Smith is the primary brand at Lowe’s and is famous for its durable glass lining. Pricing and efficiency ratings are generally comparable across similar tiers.
Conclusion
A.O. Smith has earned its place as a household name through decades of innovation and reliable manufacturing. While their products may not always have the highest raw consumer ratings on generic retail sites compared to niche brands, their professional reputation is solid.
Whether you need a high-tech hybrid to save money or a simple gas tank to get the job done, A.O. Smith likely has a model that fits your home.
