Kohler
Kohler Cimarron K-31621
$213Cheaper
Best Toilets · head-to-head
Kohler Cimarron K-31621 vs Niagara Original Stealth 0.8 GPF
A sourced, side-by-side comparison. Kohler Cimarron K-31621 is cheaper at $213. Every spec and price links to its source.
Niagara Conservation
Niagara Original Stealth 0.8 GPF
$266.18
Which is better: the Kohler Cimarron K-31621 or Niagara Original Stealth 0.8 GPF?
On the specs we track, they're closely matched. The Kohler Cimarron K-31621 is the cheaper at $213.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  Kohler Cimarron K-31621 |  Niagara Original Stealth 0.8 GPF |
|---|---|---|
| US price | $213 | $266.18 |
| Brand | Kohler | Niagara Conservation |
| Released | — | — |
| Flush type | gravity | gravity |
| Flush volume gpf | 1.28 | 0.8 |
| Map score | — | 800 |
| Bowl shape | elongated | elongated |
| Bowl height inches | — | 17 |
| Rough in inches | 12 | 12 |
| Trapway diameter inches | — | 2 |
| Piece count | two-piece | two-piece |
| Water sense certified | Yes | Yes |
| Seat included | No | No |
| Weight pounds | — | — |
Sources — Kohler Cimarron K-31621: studiokohler.com (verified 2026-07-13). Niagara Original Stealth 0.8 GPF: niagaracorp.com (verified 2026-07-13).
What's the difference between the Kohler Cimarron K-31621 and Niagara Original Stealth 0.8 GPF?
Where the two actually differ on the specs we track (1 of 11). Matching specs are omitted.
- Flush volume gpf: Kohler Cimarron K-31621 1.28 vs Niagara Original Stealth 0.8 GPF 0.8