Kohler Elliston Comfort Height Two-Piece Elongated 1.28 GPF Toilet

The Kohler Elliston positioning

The Elliston (K-31641) is Kohler's designer-leaning two-piece — the SKU that delivers AquaPiston canister flush + concealed-trapway styling + comfort height at $380-$520. It sits between the Cimarron ($240-$330) and Maxton ($330-$480) in Kohler's residential lineup, offering a different aesthetic angle than either: where Cimarron is utility-traditional and Maxton is one-piece skirted, Elliston is two-piece with the concealed trapway design language that makes it look more modern than Cimarron without going to one-piece silhouette.

The Elliston's defining feature is the concealed trapway — the curved porcelain that normally shows under a traditional two-piece bowl is hidden behind a smooth porcelain skirt. Visually, the Elliston bowl reads as a clean vertical face from the side, similar to skirted-trapway one-pieces but in a two-piece serviceability format.

The AquaPiston canister at this price tier

The Elliston uses Kohler's AquaPiston canister flush valve — same vertical cylinder mechanism that Memoirs ($720-$1,100), Maxton ($330-$480), and Adair use. Engineering details:

• 360-degree water release during flush — uniform bowl-cleansing
• Service life: 12-15 years for the canister vs 5-7 years for a flapper
• Quieter flush — no flapper "slap"
• Easier replacement when canister wears — pull-out, drop-in, no tank removal
• Kohler GP1138930 canister kit ($35-$65) for replacement at end-of-service-life

The concealed trapway design language

The Elliston bowl has the curving siphonic trapway hidden behind a smooth porcelain skirt extending from the bowl rim down toward the floor. This is different from true skirted-trapway (where the skirt goes all the way to the floor and the bowl mounting is concealed):

• Elliston: concealed-trapway from side view, but base of bowl still mounts to floor with visible bolt caps (traditional two-piece serviceability)
• Maxton (Kohler one-piece): full skirted-trapway with concealed mounting
• Standard Cimarron / Highline: exposed trapway curves visible from side

The variant matrix

What's in the box

• Tank with pre-installed AquaPiston canister flush valve
• Bowl with concealed-trapway exterior styling, pre-drilled for 12" rough-in
• Chrome trip lever (front-mount)
• Tank-to-bowl gasket and brass bolts (Korky-pattern hardware)
• Wax ring NOT included
• Some Elliston configurations include Brevia SoftClose seat (verify SKU before purchase) — most ship without
• Installation manual

Install requirements and procedure

• Rough-in: 12 inches (standard).
• Weight: ~92 lbs total (tank ~37, bowl ~55).
• Standard two-piece install — same procedure as Cimarron. The concealed trapway doesn't change the install procedure since mounting is still through visible bolt holes.
• Universal aftermarket parts — Korky/Fluidmaster aftermarket fit for fill valve, supply line, and tank-to-bowl gasket. AquaPiston canister is Kohler-proprietary (Kohler GP1138930).

What owners report

• The concealed-trapway aesthetic upgrade is real. Owners frequently mention that Elliston looks "more designer" than Cimarron at similar price range.
• AquaPiston canister flush is quiet and effective. MaP 800g — same as Cimarron and Memoirs.
• Standard ceramic glaze shows hard-water spots in mineral-heavy regions. Weekly to biweekly cleaning typical.
• Service is straightforward. Tank-to-bowl gasket replacement at 12-15 years (universal Korky 481BP $12). AquaPiston canister at 12-15 years (Kohler GP1138930 $35-$65).
• The concealed trapway slightly limits service access to the floor flange — bowl removal is needed for major flange repairs. Less restrictive than Maxton's full skirted-trapway design.
• Service life: 25+ years porcelain.

Where Elliston wins vs other Kohlers

Where Elliston competes vs other brands

• TOTO Drake II ($430-$470): Drake II has Double Cyclone flush + CeFiONtect glaze. Elliston has AquaPiston + concealed-trapway styling. Different brand strengths.
• American Standard Edgemere ($420-$580): Edgemere is compact-elongated + EverClean. Elliston is full-elongated + AquaPiston. Different optimization.
• Mansfield Brentwood ($240): Mansfield is US-cast at lower price. Elliston has Kohler brand + canister flush + concealed styling.

The verdict

Buy Elliston if:

• You want AquaPiston canister flush + modern concealed-trapway styling in a two-piece format
• Designer aesthetic matters but you want two-piece serviceability (not one-piece Maxton)
• WaterSense 1.28 GPF is required
• $60-$150 premium over Cimarron is justifiable for the styling upgrade

Skip Elliston and choose Cimarron if:

• The concealed-trapway styling isn't important — Cimarron has the same AquaPiston flush at $60-$150 less

Skip Elliston and choose Maxton if:

• You want one-piece silhouette + full skirted trapway + included SoftClose seat at similar price

Warranty

Kohler Elliston residential warranty: 1 year on tank trim, lifetime on porcelain, 5-year on AquaPiston canister. Standard Kohler customer service.

Pricing reality (2026)

Elliston K-31641-0 (White): $380-$460. Home Depot: $399-$459. Lowes: $379-$429. Build.com: $359-$419. Biscuit/Almond variants +$40-$80. Black Black +$120-$160 (special-order, 4-6 week lead).