Whole-house filter · checked 16 Oct 2026
A. O. Smith Whole House Central Multifunction Water Filter
Model AO-WH-FILTER
Lead:not claimedPFAS:not claimed
Each claim, checked
What the brand says, what a certification listing shows for this model, and where each fact comes from. We read listings; we do not test products.
- Certified (listing checked)The certifier’s public listing shows this claim for this model.
- Brand says certifiedThe brand says certified; IAPMO’s listing does not show it. NSF can be checked by hand.
- Brand claim onlyThe brand claims it without citing a certification.
| Contaminant | Brand claim | Standard | Certifier | Confirmed? | Source, date checked |
|---|---|---|---|---|---|
| Chlorine | “System Tested and Certified by NSF International against NSF/ANSI Standard 42 for the reduction of Chlorine Taste and Odor.” brand source | NSF/ANSI 42 | NSF (named by brand) | Brand says certified — not found in IAPMO’s listing; check NSF | IAPMO searched · check NSF’s listingchecked 16 Oct 2026 |
| Chloramine | “Reduces Chloramine: Yes” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
Filter changes, by the brand’s numbers
How often A. O. Smith says to replace each part. Real filter life depends on how much water you use and what is in it.
| Part | Brand says replace every | Changes a year | Source, date checked |
|---|---|---|---|
| Central Water Filter (whole tank; no separate cartridge)The brand gives more than one figure for this part. | 6 years or 600,000 gallons“Reduces 96.9% of chlorine taste and odor from every tap for 6 years or 600,000 gallons.”60 months or 600,000 gallons“Filter Life: 60 months ... Capacity Published: 600000 gal.” | 1 every 6 years or 1 every 5 years | brand sourcechecked 16 Oct 2026brand sourcechecked 16 Oct 2026 |
Certification listings found
No IAPMO R&T listing matched this model when we searched on 16 Oct 2026.
Check it yourself
NSF’s and WQA’s terms don’t allow automated lookups, so these links open their public listings for this model:
- NSF listing search: AO-WH-FILTER
- NSF listing search: A.O. Smith
- WQA listing search: AO-WH-FILTER
- WQA listing search: A.O. Smith
- IAPMO R&T listing directory
What the brand says about certification
- “System Tested and Certified by NSF International against NSF/ANSI Standard 42 for the reduction of Chlorine Taste and Odor.” source checked 16 Oct 2026
- “System independently tested to NSF/ANSI 42 Standard for the reduction of Chlorine Taste and Odor.” source checked 16 Oct 2026
Performance data sheet (names NSF International)