AO Smith has been a trusted name in water treatment since Founded 1874, based in United States. The brand is particularly known for Industry-leading water heaters including the Vertex high-efficiency line, Cyclone commercial series, and pioneering heat pump water heaters. AO Smith is positioned in the mid-range price tier, making it a solid mid-range option for water treatment.
AO Smith Water Treatment
Through its Aquasana brand and growing water treatment division, A. O. Smith offers whole-house filtration, reverse osmosis, and water softening systems for residential customers seeking clean, great-tasting water.
Mid-RangeBalanced quality and affordability
AO Smith Water Treatment Product Lines
Aquasana (subsidiary)AO Smith Whole House FiltersAO Smith Reverse Osmosis
Why Choose AO Smith for Water Treatment?
AO Smith stands out in the water treatment market because of Industry-leading water heaters including the Vertex high-efficiency line, Cyclone commercial series, and pioneering heat pump water heaters. Their products carry 4 industry certifications, including Energy Star, UL Listed, NSF Certified, giving homeowners confidence in quality and compliance. AO Smith backs their water treatment with a 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model, which shows commitment to long-term reliability. With 3 dedicated product lines — Aquasana (subsidiary), AO Smith Whole House Filters, AO Smith Reverse Osmosis — there's a AO Smith option for virtually every need and budget.
Certifications & Standards
Energy StarUL ListedNSF CertifiedCSA Certified
Warranty & Support
Warranty6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model
Phone Support1-800-527-1953
Official Websitehttps://www.hotwater.com
Where to Buy AO Smith Water Treatment
Water Treatment How-To Guides
View All →How to Install a Reverse Osmosis System
Install an under-sink reverse osmosis system for the cleanest drinking water at home -- feed water connection, filter mounting, storage tank, drain saddle, dedicated faucet, and the critical initial flush.
How to Test Your Water Quality
Test your water with DIY strips, reagent kits, or certified lab analysis -- what to test for, how to collect samples, how to read results, and what treatment actually fixes common contaminants.
How to Change Water Filter Cartridges
Swap out sediment, carbon, and specialty cartridges in whole-house and under-sink systems -- the right filters, the right schedule, and the correct order for multi-stage setups.
Common Water Treatment Problems
View All →Bad Taste or Odor in Water
Water that tastes or smells off -- chlorine, rotten eggs, metallic, musty -- has a specific cause for each type. Identifying what it tastes or smells like is the fastest path to the right fix.
Hard Water Buildup
White, chalky deposits on everything -- faucets, shower heads, glass doors, inside pipes and water heaters. Calcium and magnesium restrict flow, kill efficiency, shorten appliance life. About 85% of US homes have hard water.
Low RO System Output
RO system filling slowly, weak trickle, or running out of water? Clogged pre-filters, worn membrane, low feed pressure, or waterlogged tank. Most fixes are filter replacements or pressure adjustments.
Water Treatment Types
View All →Water Treatment Buying Guides
View All →AO Smith Water Treatment FAQ
Is AO Smith a good brand for water treatment?
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.
What warranty does AO Smith offer on water treatment?
AO Smith offers 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model.
Where is AO Smith made?
AO Smith is based in United States, headquartered in Milwaukee, Wisconsin.
What price range does AO Smith water treatment fall into?
AO Smith is positioned in the mid-range price tier for water treatment. They balance quality and affordability well.
What water treatment product lines does AO Smith offer?
AO Smith offers 3 water treatment product lines: Aquasana (subsidiary), AO Smith Whole House Filters, AO Smith Reverse Osmosis.
What certifications does AO Smith have for water treatment?
AO Smith holds 4 certifications including Energy Star, UL Listed, NSF Certified.
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