Rheem Preferred Plus RHS42
42,000-grain salt-based softener · $589
| Type | salt-based |
| Grain capacity (max, at highest salt dose) | 42,000 grains |
| Salt per regeneration (max dose) | 16.3 lbs |
| Regeneration | metered |
| Service flow rate | 9.9 GPM |
| Max hardness | 140 gpg |
| Iron removal | Up to 11 ppm |
| Water per regeneration | — |
| Certifications | None stated on source page |
| Warranty | 1 yr parts/labor (extendable to 5), 3 yrs electronics, 10 yrs tanks |
| Dimensions | 48" H x 15.25" W x 20.5" D |
| Bypass valve included | — |
| Recommended household | Up to 6 people |
Worth knowing
Home Depot exclusive ($589). Built-in sediment filter, handles up to 1-1/4" plumbing. Rated 42,400 grains at the max 16.3-lb dose, 5,010 grains/lb at the 2.5-lb minimum.
Specs read from the manufacturer's documentation on 2026-08-22. Fields shown as “—” were not stated there.
Compare with similar units
| Model | Type | Capacity | Flow | Price | |
|---|---|---|---|---|---|
| SpringWell SS+ Salt-Based Softener | salt-based | 80,000 gr | 20 GPM | $2,678 | Check price |
| SpringWell SS4 Salt-Based Softener | salt-based | 48,000 gr | 13 GPM | $1,785 | Check price |
| SoftPro Elite Smart HE 48,000 | salt-based | 48,000 gr | 15 GPM | $1,457 | Check price |
| Aquasure Harmony AS-HS48D | salt-based | 48,000 gr | — | $630 | Check price |
| GE GXSH45V | salt-based | 45,100 gr | 9.5 GPM | $586 | Check price |
| A.O. Smith AO-WH-SOFT-450T | salt-based | 45,000 gr | 7.5 GPM | — | Check price |
Specs read from manufacturer pages. Each unit's page lists its source and check date. “—” means not yet sourced, never guessed.
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