Quick Answer: A.O. Smith Corporation (NYSE: AOS) already owns two softener brands this site has reviewed — Hague (dealer-only) and WaterBoss (DIY-boxed) — but it also sells a third softener line under its own name, exclusively through Lowe’s. A.O. Smith became Lowe’s primary residential water-treatment brand in 2018, shipping more than 20 A.O. Smith-badged products to stores that August. Unlike GE, Whirlpool, and Morton — all built under license by a company called Water Channel Partners — A.O. Smith’s own Water Treatment division (headquartered in Appleton, Wisconsin) designs and sells this line directly. The catch: its 3-year parts warranty is shorter than its own DIY sibling brand WaterBoss’s 5-year coverage.
This site has spent a lot of column space tracing softener brands back to Water Channel Partners — GE, Whirlpool, Morton, and NorthStar all share that one Woodbury, Minnesota factory. A.O. Smith breaks that pattern in the opposite direction: it’s a brand that genuinely builds what it sells, and it’s also the third distinct softener operation under one publicly traded parent. This guide covers the Lowe’s-exclusive lineup, the real warranty terms, and where it fits next to its own corporate siblings.
A.O. Smith became Lowe’s primary water-treatment brand in 2018
Per A.O. Smith’s own investor announcement, the company was selected as Lowe’s primary supplier of residential water-treatment products in April 2018, and began shipping more than 20 A.O. Smith-branded products — water softeners, whole-house filters, and reverse osmosis systems — to Lowe’s stores nationwide starting in mid-August 2018. That’s a different arrangement from how GE, Whirlpool, and Morton softeners reach the shelf: those three brands license their names onto hardware built by Water Channel Partners (formerly Ecodyne), a manufacturer none of them own. A.O. Smith’s water-treatment line, by contrast, is run by the company’s own Water Treatment North America division, based in Appleton, Wisconsin — the parent corporation selling softeners under its own name through its own water-treatment business, not a licensed badge on someone else’s hardware.
That makes A.O. Smith the only brand on this site where “who actually makes it” and “whose name is on the box” are the same answer. It’s also now the third distinct softener operation sitting under A.O. Smith Corporation (NYSE: AOS), alongside Hague (acquired September 2017, dealer-only, no published price) and WaterBoss (also A.O. Smith-owned, DIY-boxed, under $700). Three softener brands, three completely different sales channels, one ticker symbol.
The lineup: 350C, 400T, 450T, and PRO-500
All four current A.O. Smith-branded softeners are sold as Lowe’s exclusives and share the same single-cabinet design — resin tank and brine storage combined into one unit, controlled by a 2.7-inch monochrome touchscreen rather than a conventional digital keypad:
| Model | Grain capacity | Wi-Fi | Best for |
|---|---|---|---|
| AO-WH-SOFT-350C | 35,000 | No | Smaller households, tight utility closets (compact footprint) |
| AO-WH-SOFT-400T | 40,000 | No | 3-4 person households, moderate hardness |
| AO-WH-SOFT-450T | 45,000 | Yes, via app | Larger households that want remote salt/usage monitoring |
| AO-WH-SOFT-PRO-500 (“Premier”) | 50,000 | Yes, Wi-Fi compatible | Larger households or harder well water |
Published, checkout-ready pricing isn’t consistent across A.O. Smith’s own retail pages — several Lowe’s listings for these models show a “shop now” link rather than an inline price, and historical pricing on the 400T has ranged from roughly $450 to $590 depending on the year and any active promotion. Check the current in-store or online Lowe’s price before assuming any figure you see elsewhere is still accurate.
The warranty gap nobody expects
Every current A.O. Smith-branded model carries the identical tiered warranty, per A.O. Smith’s own product pages:
- 3 years on mechanical and electronic parts
- 10 years on the media tank, main control valve, and brine cabinet
That 10-year tank tier is solid. The surprise is the 3-year parts tier, because it’s shorter than the 5-year mechanical/electronic warranty this site’s own WaterBoss review documents — meaning the parent company’s own flagship-badged retail line carries a shorter parts warranty than the cheaper, less-prominent sibling brand it also owns. If warranty length on parts is what you’re optimizing for within the A.O. Smith family, WaterBoss — not the A.O. Smith name itself — is the longer-covered option.
AO-WH-SOFT-400T — the plain 40,000-grain pick
A.O. Smith AO-WH-SOFT-400T 40,000 Grain Water Softener
- Single-cabinet design combines resin and brine storage in one compact footprint.
- Sold and serviced through Lowe's, not a dealer network — no in-home water test required.
- Designed and sold directly by A.O. Smith's own Water Treatment division, not a licensed third-party build.
- 3-year parts warranty is shorter than sibling brand WaterBoss's 5-year coverage at a similar price point.
Replacement filters on time, every time — Prime ships them free in two days. Try it free for 30 days.
The 400T is the straightforward middle option in the lineup — no Wi-Fi, no app, just a 40,000-grain single-cabinet softener for a typical household on moderate hardness, sold at a Lowe’s shelf price rather than a dealer quote.
AO-WH-SOFT-450T — Wi-Fi monitoring, higher capacity
A.O. Smith AO-WH-SOFT-450T 45,000 Grain Smart Water Softener
- Same single-cabinet, touchscreen-controlled design as the 400T, with added Wi-Fi for remote salt-level and usage monitoring.
- Higher grain capacity than the 400T — better suited to larger households or harder water.
- Same tiered 3-year parts / 10-year tank warranty as every other model in the A.O. Smith lineup.
If remote monitoring matters to you, the 450T adds it without changing the warranty math — you’re still trading A.O. Smith’s own name and Lowe’s availability for a shorter parts warranty than WaterBoss offers at a lower price.
A.O. Smith vs the rest of the lineup
Vs. Hague and WaterBoss (same parent, two other channels). A.O. Smith Corporation now runs three distinct softener businesses: Hague (dealer-only, no published price, $3,800-$10,000-plus installed), WaterBoss (DIY-boxed, under $700, 5-year parts warranty), and this Lowe’s-exclusive A.O. Smith-badged line (DIY-boxed, Wi-Fi options, 3-year parts warranty). None shares a cabinet platform or warranty structure with the others, despite one parent company.
Vs. GE, Whirlpool, and Morton (Water Channel Partners-built). This site’s GE, Whirlpool, and Morton reviews all trace back to the same Woodbury, Minnesota manufacturer building softeners under license. A.O. Smith is the one brand on this site that designs and sells what it builds directly, through its own Water Treatment North America division — the opposite arrangement.
Vs. published-price online systems. A Fleck 5600SXT build or a SpringWell SS1 both carry a lifetime warranty on the tank and valve — well beyond any tier in the A.O. Smith lineup — typically for a comparable or only moderately higher price than A.O. Smith’s own models once Lowe’s current pricing is accounted for.
Bottom line
A.O. Smith’s own branded softeners are a genuinely different animal from its two other softener businesses: designed and sold directly by the parent company’s Water Treatment division rather than licensed out or run as a separately-branded acquisition, and sold exclusively through Lowe’s since the company became Lowe’s primary water-treatment supplier in 2018. The lineup (350C/400T/450T/PRO-500) is straightforward and Wi-Fi options are a real upgrade on the higher-end models — but the 3-year parts warranty is shorter than sibling brand WaterBoss’s 5-year coverage, which is the one surprise worth knowing before you pick the A.O. Smith name over its own cheaper sibling. For the longest warranty in the category, a Fleck 5600SXT build or SpringWell SS1 still wins outright.
Prices are approximate and change often — tap any button above to check the current Amazon price.