A. O. Smith AO-WH-FILTER Whole House Water Filter review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 8.25/10, tied for 11th of the 12 whole-house systems we track. At $399.99 it costs less than half the category median of $854.12. Its NSF listing covers chlorine, taste and odor only (NSF/ANSI 42). 3 of the 12 whole-house systems are listed for a health claim. On Amazon, 57 of the 72 reviews that mention leakage are negative.
A lower budget: $399.99, in the cheapest quarter of the 10 whole-house systems with a published price
Reliability comes first: 57 of 72 Amazon reviews about leakage are negative
- Price
- $399.99
- Certified for
- Chlorine
- Flow
- 7 gpm
- Cartridge life
- 600,000 gal
- Cost per year
- Not stated
- Warranty
- 6 years limited
Certification
Listed by NSF under NSF/ANSI 42 for Chlorine, checked Oct 15, 2026. A. O. Smith also claims 1 more substance that is not in the listing. Search the NSF listings
- Chlorine
A. O. Smith also claims Chloramine: brand claims, not in a certifier listing.
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
Warranty: 6 years limited. Returns: Set by the retailer. Shipping: not stated by the brand. Source: A. O. Smith data sheet, checked Oct 15, 2026.
Source: A. O. Smith data sheet, checked Oct 15, 2026.
Compared with similar whole-house systems
All 12 whole-house systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Pentair FloPlus Protect 20BB Whole House PFAS System | $258 | PFAS | $187 | 1 year | 9.5/10 | Check price → |
| A. O. Smith AO-WH-FILTER Whole House Water FilterTHIS MODEL | $399.99 | Chlorine | — | 6 years limited | 8.25/10 | Check price → |
| 3M Aqua-Pure AP904 Whole House System | $424.71 | Chlorine | $325 | 25 years | 9.5/10 | See specs → |
| Express Water WH300SCGS 3-Stage Whole House, Essential | $497.99 | Brand claims only | $215 | 1 year | 8.75/10 | Check price → |
| Express Water WH300SCKS 3-Stage Whole House, Heavy Metals | $547.99 | Brand claims only | $336 | 1 year | 8.5/10 | Check price → |
What owners say
Checked Oct 15, 202657 of 72 Amazon reviews about leakage are negative. In our score this is 1.5 of 2 points. How we score
- Functionality177 mentions129 positive48 negative
- Value for money94 mentions57 positive37 negative
- Water quality89 mentions56 positive33 negative
- Leakage72 mentions15 positive57 negative
- Durability45 mentions16 positive29 negative
- Sturdiness28 mentions20 positive8 negative
- Water taste28 mentions25 positive3 negative
Store ratings change over time; the date shows when we checked.