3M vs AO Smith Water Treatment
Updated February 23, 2026
Comparing 3M and AO Smith for Water Treatment — see how they stack up on price, warranty, certifications, and product range.
Side-by-Side Comparison
| Feature | 3M | AO Smith |
|---|---|---|
| Founded | Founded 1902 | Founded 1874 |
| Country | United States | United States |
| Price Tier | premium | mid-range |
| Warranty | Varies by product line; Aqua-Pure systems typically carry a 1-year limited warranty | 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model |
| Certifications | 3 certifications | 4 certifications |
About 3M
3M is a diversified global technology company with over a century of innovation. Their water filtration division, known for the Aqua-Pure product line, serves both residential and commercial markets with advanced filtration solutions. In 2024, 3M spun off its healthcare division as Solventum, but continues to offer water treatment products through its safety and industrial segment.
Known for: Aqua-Pure residential and commercial water filtration systems backed by decades of filtration science
About AO Smith
A. O. Smith Corporation is one of the world's leading manufacturers of residential and commercial water heating equipment, headquartered in Milwaukee, Wisconsin since its founding in 1874. The publicly traded company (NYSE: AOS) has grown through strategic acquisitions to own major brands including State Water Heaters, Lochinvar, Takagi, Reliance, and Aquasana. A. O. Smith also operates one of the largest water treatment businesses globally, with significant market presence in North America, China, and India.
Known for: Industry-leading water heaters including the Vertex high-efficiency line, Cyclone commercial series, and pioneering heat pump water heaters
Frequently Asked Questions
Is 3M or AO Smith better for water treatment?
Both are reputable brands. 3M is positioned in the premium price tier, while AO Smith is in the mid-range tier. Your choice depends on budget and specific feature needs.
Which brand has a better warranty?
3M offers Varies by product line; Aqua-Pure systems typically carry a 1-year limited warranty. AO Smith offers 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model.