Rheem
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42)
$689
Best Water Softeners · head-to-head
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs EcoPure EP42 42,000 Grain Water Softener
A sourced, side-by-side comparison. Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) is cheaper at $689. Every spec and price links to its source.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) |  EcoPure EP42 42,000 Grain Water Softener |
|---|---|---|
| US price | $689 | — |
| Brand | Rheem | EcoPure |
| Released | — | — |
| Grain capacity | 42.4 | 42 |
| System type | ion-exchange | ion-exchange |
| Flow rate gpm | 9.9 | — |
| Salt efficiency lbs per kgrains | — | — |
| Iron removal ppm | 11 | 11 |
| Nsf certifications | — | NSF Certified |
| Smart app control | Yes | No |
| Tank warranty years | 10 | 10 |
| Msrp usd | 689 | — |
Sources — Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42): rheemwatertreatment.com (verified 2026-06-26). EcoPure EP42 42,000 Grain Water Softener: ecopure.com (verified 2026-06-26).
What's the difference between the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) and EcoPure EP42 42,000 Grain Water Softener?
Where the two actually differ on the specs we track (2 of 9). Matching specs are omitted.
- Grain capacity: Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) 42.4 vs EcoPure EP42 42,000 Grain Water Softener 42
- Smart app control: Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) true vs EcoPure EP42 42,000 Grain Water Softener false