# Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42): specs and price

**Price (US):** $689 ($689 regular price at Home Depot. $639 with Home Depot credit card promo. Original harvested price of $639 was the promo price.), as of 2026-06-26. Among the 18 water softeners we track it is #12 cheapest of 18; category median $630.
**Brand:** Rheem
**Deskmark:** Silver Deskmark — pay-blind category standing 83/100, #8 of 19 in class (independent, computed from sourced data, never for sale).
**Price tracked since:** June 2026

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $689 |
| Brand | Rheem |
| Grain capacity | 42.4 |
| System type | ion-exchange |
| Flow rate gpm | 9.9 |
| Salt efficiency lbs per kgrains | — |
| Iron removal ppm | 11 |
| Nsf certifications | — |
| Smart app control | Yes |
| Tank warranty years | 10 |
| Msrp usd | 689 |

## Where it stands

At $689, the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) is #12 cheapest of the 18 water softeners we track, where the median is $630. On the spec sheet, its flow rate gpm of 9.9 is the lowest of the 7, its tank warranty years of 10 is the highest of the 12, and its grain capacity of 42.4 is above the median of the 18.

## Frequently asked questions

**How much does the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) cost?**

The Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) has a US price of $689 ($689 regular price at Home Depot. $639 with Home Depot credit card promo. Original harvested price of $639 was the promo price.), as of 2026-06-26.

**How does the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) compare on price?**

At $689, the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) is #12 cheapest of the 18 water softeners we track, where the median is $630.

**What are the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42)'s key specs?**

Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) (Rheem): grainCapacity 42.4, systemType ion-exchange, flowRateGpm 9.9, ironRemovalPpm 11, smartAppControl Yes. Full sourced spec sheet verified 2026-06-26.

Source: https://www.rheemwatertreatment.com/product/preferred-platinum/ (rheemwatertreatment.com, accessed 2026-06-26)
Corroboration: https://www.homedepot.com/p/Rheem-42-000-Grain-Preferred-Platinum-Wi-Fi-Enabled-Smart-Water-Softener-for-Hard-Water-and-Iron-Reduction-RHW42/314448281 (accessed 2026-06-26)
Canonical: https://frontdeskreview.com/product/water-softeners/rheem-rhw42/
Cite: Per The Front Desk Review, the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) price of record was $689 as of 2026-06-26 — https://frontdeskreview.com/product/water-softeners/rheem-rhw42/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl