A. O. Smith AO-WH-FILTER
#1 in TankFull review
A certified, maintenance light tank for a small or medium home on chlorinated city water.
Amazon $399$399
3.3/5
For a household that wants to fit a filter and forget it for a decade on chlorinated city water.
- $0.95 per 1,000 galRunning cost
- 1,000,000 gallonsCapacity
- 7 gpmFlow
Check price at Amazon$999
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- A million gallons or ten years between tank changes
- No drain, power or backwash cycle needed
- Ten year warranty matches the media life
Cons
- Rated service flow is 7 gpm, though Aquasana gives a 14.6 gpm peak
- Tested to NSF/ANSI 42, not certified
- A replacement tank costs nearly as much as the system on Amazon
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its build. How we rank explains each one.
Specifications
| Model number | WH-1000 |
|---|---|
| Filtration | |
| Capacity | 1,000,000 gallons |
| Replacement filters or media | $949 |
| Running cost | $0.95 per 1,000 gal |
| Stages | 4 |
| Tested to (not certified) | NSF/ANSI 42 |
| Chloramine | No |
| PFAS | No |
| Build | |
| Flow | 7 gpm |
| Ports | 1 in |
| Backwashing | No |
| UV stage | No |
| Warranty | 10 years |
Alternatives in this build
iSpring WF150K
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A backwashing carbon tank for owners who want a long life system with a long warranty and have a drain nearby.
Amazon $1,673.70$1,673.70
Aquasana Rhino Max Flow with UV
#4 in TankFull review
For a large house that needs high flow and wants UV added. Most city homes can skip the UV and pay less.
Amazon $2,246.99$2,246.99
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