Kohler Kelston K-3754 Toilet Review

The Kohler Kelston K-3754 is a two-piece, elongated toilet with Kohler’s Comfort Height bowl, an AquaPiston canister flush and a 1.6 gallon-per-flush tank. It is a traditional, exposed-trapway design aimed at homeowners who want a chair-height Kohler toilet with a sturdy flush and a simple install. Its main drawback today is water use: at 1.6 gpf it is not WaterSense certified, while its 1.28 gpf twin, the K-3755, is.

This review is based on Kohler’s specification sheets, product listings and warranty terms. We have not physically tested the Kelston; see our methodology for how we work.

Status as of November 2026: Kohler still has a K-3754 product page and spec sheet, but Kohler’s online store marked it out of stock and Kohler’s Studio Kohler design site lists the K-3754 as discontinued. Its 1.28 gpf sibling, the K-3755, has a spec sheet revised in late October 2026. We consider the K-3754’s status unclear and likely being phased out; Home Depot still had a listing for it when we checked.

Design overview

Kelston is one of Kohler’s mainstream bathroom collections, with matching faucets and accessories. The K-3754 toilet combines the K-4306 elongated bowl with the K-4474 1.6 gpf tank. It has an exposed trapway, so the curve of the drain shows on the side of the base, and a left-hand polished chrome trip lever.

The elongated bowl gives more front-to-back room than a round bowl, at the cost of a bit more floor space. If you’re unsure which shape fits your bathroom, see elongated vs round toilets.

Flushing: AquaPiston canister

Instead of a flapper, the Kelston uses Kohler’s AquaPiston canister flush valve. Kohler says the canister optimizes the flow of water out of the tank, using gravity to increase the power of the flush. It also says the canister needs less force to operate than a 3-inch flapper and has 90 percent less exposed seal material, which Kohler says resists the wear, shrinkage and swelling that lead to leaks.

The trapway is 2-1/8 in. according to Kohler. It’s a gravity-fed design, so it is quieter and simpler to service than a pressure-assist toilet.

Water use: K-3754 vs K-3755

The K-3754 flushes at 1.6 gpf, the federal maximum. Its spec sheet does not list EPA WaterSense. The Kelston K-3755 uses the same K-4306 bowl with a 1.28 gpf tank (K-4469), and Kohler lists WaterSense certification and possible eligibility for local rebates.

Spec	Kelston K-3754	Kelston K-3755
Flush rate	1.6 gpf	1.28 gpf
Tank	K-4474	K-4469
Bowl	K-4306 elongated, Comfort Height	K-4306 elongated, Comfort Height
Flush valve	AquaPiston	AquaPiston
Trapway	2-1/8 in., exposed	2-1/8 in., exposed
WaterSense	Not listed	Yes

EPA says WaterSense toilets use no more than 1.28 gpf, 20 percent less than the 1.6 gpf standard. In a busy family bathroom, that difference is repeated many times a day, which is why many local utilities favor WaterSense models.

Height and accessibility

The Kelston uses Kohler’s Comfort Height bowl, which Kohler describes as chair-height seating that makes sitting down and standing up easier for most adults. Kohler’s toilet buying guide describes chair-height toilets as roughly 17 in. or more from floor to seat top.

Kohler notes the K-3754 is ADA compliant only when installed to those requirements, and adds that the model is acceptable for left-hand accessible compartment installations only, because the trip lever is on the left. If you are planning an accessible bathroom, read our chair height vs standard height guide and check local code.

Installation

Kohler lists a standard 12 in. rough-in. The K-3754 uses Kohler’s DryLock system, which Kohler says saves installation time and helps prevent leaks. The seat and supply line are sold separately, so add both to your shopping list along with a wax ring if needed.

Because it is a two-piece toilet, the tank and bowl arrive separately and are bolted together on site. That makes each piece lighter to carry up stairs than a one-piece toilet, but it adds a tank-to-bowl joint that needs a good seal and occasional cleaning. If the flange is damaged, the floor feels soft, or you aren’t comfortable shutting off and reconnecting the water supply, hire a licensed plumber.

Warranty

Kohler’s toilet warranty page names Kelston among the series with a five-year limited warranty on mechanical components for residential use, shorter than the ten years on most Kohler toilets. Vitreous china carries a lifetime limited warranty for residential installs, and seats are covered for one year. Exclusions apply, so read the full document.

Pros and cons

Current alternatives

Because the K-3754’s availability is uncertain, here are Kohler models with current spec sheets that cover similar needs. All are two-piece, elongated and flush at 1.28 gpf with WaterSense certification.

Model	Height	Trapway	Seat included
Kohler Kelston K-3755	Comfort Height	Exposed	No
Kohler Elliston K-33202	Comfort Height	Exposed	Yes (Complete Solution kit)
Kohler Transpose K-46018	Comfort Height	Skirted	Yes (Complete Solution kit)

The K-3755 is the closest match, since it uses the same bowl. The Elliston and Transpose add a seat, wax ring and hardware in the box plus Kohler’s Revolution 360 swirl flush; the Transpose also has smooth skirted sides that are easier to wipe down. See our Kohler Transpose review for more.

Who it’s for

• Owners matching an existing Kelston bathroom who want the same collection styling.
• Buyers who want a chair-height, elongated toilet with a traditional profile.
• DIYers comfortable buying a seat and supply line separately.

If saving water or qualifying for a rebate matters, the K-3755 or another 1.28 gpf model is a better fit.

What to check before you buy

1. Model and tank. Make sure you’re getting the full combination (bowl plus tank), and whether it’s the 1.6 gpf K-3754 or 1.28 gpf K-3755.
2. Rough-in. Kohler lists 12 in.
3. Local rules and rebates. Some areas offer rebates only for WaterSense toilets.
4. Lever side. The left-hand lever matters for accessible stalls and tight side walls.
5. Availability. With stock uncertain, confirm the seller and warranty coverage.

Frequently asked questions

Does the Kohler Kelston K-3754 come with a seat?

No. Kohler’s spec sheet says the seat and supply line are sold separately.

Is the Kelston K-3754 a Comfort Height toilet?

Yes. Kohler lists the Comfort Height feature, which it describes as chair-height seating.

What’s the difference between the Kelston K-3754 and K-3755?

They share the same Comfort Height elongated bowl and AquaPiston flush. The K-3754 has a 1.6 gpf tank; the K-3755 has a 1.28 gpf tank and is WaterSense certified.

Next steps

Compare the Kelston with other Kohler models in our toilet reviews, or see how the brand compares with its main rival in Kohler vs American Standard toilets.