Best Dual Flush Toilet by Flush Rating and Height

The best dual flush toilet for most bathrooms is the HOROW T0338W, a compact one-piece with a 17.3" ADA seat height and a 1.1 GPF light flush that fits a 26.6" deep footprint. If you want a rimless bowl that wipes clean in one pass, the DeerValley DV-1F0437 is the better buy at 1/1.28 GPF. Here is the 30-second shortlist: HOROW for tight ADA-height baths, DeerValley for rimless cleaning, and the Gerber Maxwell for high-traffic rooms.

Best dual flush toilet at a glance

A quick note on the search itself. This roundup covers the best dual flush toilet options plus two dual flush valve kits, because the listings that surface for this term mix complete toilets with retrofit parts. The kits do not make every toilet dual flush. They only fit certain two-piece tanks. I flag exactly which is which below.

How I screened these seven picks

I worked from the published specifications, not from hands-on use. My screening was profile-first: I mapped each product to the buyer it actually serves, then checked whether the specs backed that up.

Here is the order I applied:

1. Flush volume. I compared the light and full GPF figures side by side. Lower light flush wins on water, higher full flush wins on clearing.
2. Seat height. ADA chair height near 17" matters for accessibility. Standard height sits lower.
3. Footprint. Depth and width decide whether it fits a small room.
4. Install effort. Weight and rough-in flexibility change how hard the job is.

Two of the seven are not toilets at all. They are 3-inch dual flush valve kits for two-piece tanks. I kept them because the search returns them and because they solve a real problem: turning a tired single-flush toilet into a dual flush one. I did not cut them, but I ranked them as what they are.

Nothing here published review data, so none of my judgments lean on that. Every figure below is a copied specification or an attributed manufacturer claim.

1. HOROW T0338W One Piece Toilet with ADA Chair Height 17.3" — Best overall

The HOROW T0338W wins because it packs a 17.3" ADA seat and a 1.1 GPF light flush into a 26.6" deep body that suits a small bathroom.

Best for: small bathrooms that need ADA seat height Skip it if: your rough-in is not 10 or 12 inches

What sets this best dual flush toilet apart in the group is the balance of size and comfort. The seat sits at 17.3" from the floor, chair height, which makes sitting and standing easier. Yet the body measures only 26 x 26.6 x 15 in, so it slots into rooms where a bigger unit would crowd the door. It weighs 99.2 lb, mid-pack among the one-piece picks here.

HOROW says the flush is 1.1 GPF, paired with siphon flushing and a fully-glazed 2" trapway for waste removal. That light flush is the lowest full-use figure in this set. The listing also states a soft-close PP seat and both 10-inch and 12-inch rough-in versions, which is rare flexibility. It carries a 1 Year warranty, one of only three picks here that publish one.

The trade-off: it sits at the top of the price range among the toilets, and the warranty runs shorter than you might expect for that position.

Pros:

• Lowest light flush figure at 1.1 GPF
• 17.3" ADA chair height for easier use
• Compact 26.6" deep footprint
• 10-inch and 12-inch rough-in options
• Published 1 Year warranty

Cons:

• Near the top of the price range here
• Only a 1 Year warranty
• Single-flush figures read as 1.1/1.1 in the listing

2. DeerValley Elongated One-Piece Toilet with Comfort Chair — Most versatile

The DeerValley DV-1F0437 earns its spot with a rimless bowl and a 1/1.28 GPF split that pairs a very low light flush with strong full clearing.

Best for: buyers who want a rimless bowl and easy cleaning Skip it if: you need a published warranty on paper

The rimless bowl is the differentiator in this set. DeerValley says the seamless one-piece build carries neat lines and a low profile, and the rimless design removes the under-rim ledge where grime hides. That is a genuine cleaning advantage none of the other bowls here claim.

Flush volume is 1 or 1.28 GPF, so the light flush matches the lowest here while the full flush stays comfortably strong. The listing also cites a MAP 1000g rating for waste clearing. Seat height is an ADA-compliant 17.5" by the brand's claim, and the seat is soft-close with quick-release for cleaning. It weighs 94.8 lb, the lightest of the four one-piece toilets.

The catch is documentation. No warranty is listed for this pick, unlike the HOROW and the two DeerValley siblings. It sits mid-range on price, so you are not overpaying, but you go in without stated coverage.

Pros:

• Rimless bowl for easier cleaning
• 1 GPF light flush, lowest in the set
• MAP 1000g clearing claim
• Lightest one-piece here at 94.8 lb
• Quick-release soft-close seat

Cons:

• No warranty listed
• Silver button finish limits colour matching
• Height stated as a claim, not a standard spec

3. DeerValley Compact One Piece Toilet Standard Seat Height — Best for quiet operation

This compact DeerValley claims a 28dB soft-close seat, the quietest figure any pick here publishes, in a body just 24.6" wide.

Best for: shared walls and light-sleeping households Skip it if: you want an elongated bowl or chair height

Noise is the deciding trait here. DeerValley states the soft-close PP seat operates at just 28dB, a number none of the others quote. If you share a wall with a bedroom, that matters more than any flush spec. The fully skirted base is the other standout: it removes the crevices behind the bowl, so cleaning takes seconds.

The dual flush is 1.1/1.6 GPF, and DeerValley says that saves up to 16,500 gallons a year against an old 3-plus gallon toilet. It is the lightest complete toilet in the group at 78 lb, and the smallest footprint at 27.8 x 24.6 x 13 in. It ships with a full install kit: wax ring, bolts, wrench and a pre-assembled valve. It carries a 1-Year warranty.

Two compromises stand out. The bowl is round, not elongated, so it offers less seating room. And the seat sits at standard height, not the ADA chair height of the HOROW.

Pros:

• 28dB soft-close seat claim, quietest here
• Lightest complete toilet at 78 lb
• Fully skirted base for easy cleaning
• Complete install kit included
• 1-Year warranty published

Cons:

• Round bowl offers less room
• Standard height, not ADA chair height
• 1.6 GPF full flush uses more than rivals

4. Gerber Maxwell Select Elongated Two-Piece Dual-Flush — Best upgrade

The Gerber Maxwell is the only two-piece toilet here, which makes it far easier to carry and set in place than the one-piece bodies.

Best for: high-traffic bathrooms and easier handling Skip it if: you dislike cleaning a two-piece seam

The two-piece build is the story. You install the bowl and tank separately, so no single component approaches the 99 lb of the HOROW. That alone makes this the friendliest install for one person. It is the second-cheapest complete toilet here, sitting in the entry range, yet it comes from a plumbing-focused brand.

Gerber says the split-flush uses 1.28 and 1.0 GPF through a canister flush valve, which the listing ties to a strong, bowl-clearing flush for high-traffic rooms. The bowl is elongated, so it gives more room than the compact DeerValley. A smooth glazed trapway and a soft-close seat round out the claims. The overall size runs 31 x 28.5 x 17.5 in, the tallest listed dimension in the group.

The downside of any two-piece is the tank-to-bowl seam, which collects dust and needs wiping. This pick also lists no warranty and no separate seat-height figure, so accessibility buyers have less to go on.

Pros:

• Only two-piece here, easier to carry
• Entry-range price for a complete toilet
• Elongated bowl for more room
• 1.0 GPF light flush claim
• Canister flush valve for strong clearing

Cons:

• Tank seam collects dust
• No warranty listed
• No seat-height figure published

5. Swiss Madison St. Tropez Comfort Height One-Piece — Best premium

The Swiss Madison St. Tropez brings a cyclonic Vortex flush and a comfort-height elongated bowl, in the heaviest and most substantial body here.

Best for: large bathrooms wanting a cyclonic rinse bowl Skip it if: you have to carry it upstairs alone

The Dual Vortex Flush is what you pay for here. Swiss Madison says it creates a cyclonic rinsing action that scrubs the bowl during each flush, a mechanism none of the other picks describe. The ceramic is stated as scratch-resistant and non-porous, and the bowl is elongated and comfort height for extra room.

Flush volume is 1.1/1.6 GPF, matching the quiet DeerValley on numbers. The body is the largest and heaviest in the group at 31.3 x 27 x 15.2 in and 109 lb, so this is not a solo lift up a flight of stairs. It uses a standard 12" rough-in and carries a 1 Year Limited Warranty.

This is the most expensive pick here. That buys you the Vortex bowl action and a glossy finish, but the flush figures land no lower than the mid-priced picks. Weigh the rinse claim against the premium position, because on raw water numbers it does not undercut the field.

Pros:

• Cyclonic Vortex flush action claim
• Comfort-height elongated bowl
• Scratch-resistant non-porous ceramic
• Standard 12" rough-in
• 1 Year Limited Warranty

Cons:

• Most expensive pick here
• Heaviest at 109 lb
• 1.6 GPF full flush, no water advantage

6. Senshare 3 Inch Dual Flush Valve Replacement Kit — Best budget pick

The Senshare kit is the cheapest way to add dual flush to an existing two-piece toilet, with a no-cut adjustable overflow tube.

Best for: fixing a weak-flushing two-piece toilet Skip it if: you own a one-piece toilet

This is not a toilet. It is a repair kit, and it is the cheapest of the seven picks. Senshare designed it for most 3-inch two-piece toilets and lists compatibility with Glacier Bay, Toto, WaterRidge and AquaSource among others. It fits flush valve openings from 3.2" to 3.6" and button holes from 1.9" to 2.2".

The no-cut adjustable design is the standout. Senshare says traditional overflow tubes often need cutting, and this one adjusts instead, which makes a DIY swap less fiddly. The kit converts an old single-flush toilet to a half-flush for liquids and a full flush for solids, with the half flush cited around 0.8 to 1 gallon. It uses durable ABS components and an extra-thick gasket for sealing. The whole thing measures 9 x 5.9 x 4.3 in.

The limits are clear. It only fits two-piece tanks, not one-piece toilets, and only those inside the stated opening range. No warranty is listed, and success depends on your existing tank matching the dimensions.

Pros:

• Cheapest pick in the set
• No-cut adjustable overflow tube
• Wide 3.2" to 3.6" opening range
• Extra-thick gasket for sealing
• Converts old toilets to dual flush

Cons:

• Two-piece toilets only
• No warranty listed
• Fit depends on your tank dimensions

7. houpeoro 3-Inch Dual Flush Valve Replacement Kit — Best minimal setup

The houpeoro kit bundles a push button, fill valve, gasket and bolts into one universal package for a fast two-piece tank swap.

Best for: a fast valve swap with a push button included Skip it if: your flush valve opening is under 3.2 inches

The completeness is the draw. houpeoro packs the push button, fill valve, gasket and bolts together, so you are not hunting for missing parts mid-job. It is the second-cheapest pick and, notably, the only item in this whole set with more than one seller listing it.

Like the Senshare, it fits most 3-inch two-piece toilets and names Glacier Bay, American Standard and Toto as compatible. The opening range is the same 3.2" to 3.6", with a 1.9" to 2.2" button hole. houpeoro says the kit stops leaks, cuts wobbling and restores flush power, and it offers full and half-flush options. The build uses high-quality ABS for stability under varying water pressure. It measures 7 x 11 x 3 in.

The constraints match its rival. It is for two-piece tanks only, not one-piece toilets, and only within the stated opening range. No warranty is published. If your tank falls outside 3.2" to 3.6", this kit will not seat correctly, so measure before you buy.

Pros:

• Complete kit with push button and fill valve
• Second-cheapest pick here
• Multiple sellers stock it
• Universal 3.2" to 3.6" fit range
• ABS build for pressure stability

Cons:

• Two-piece toilets only
• No warranty listed
• Fails if opening is under 3.2"

What actually decides a dual flush toilet?

Most guides lead with the full-flush number. That is the wrong anchor. The full flush clears solids and every pick here handles that. What actually decides your water bill is the light flush, the one you use most often each day.

Look at the spread. The HOROW claims 1.1 GPF and the DeerValley DV-1F0437 claims 1 GPF on the light flush. The quiet DeerValley and the Swiss Madison both use 1.1 on light but 1.6 on full. Over a year of mostly light flushes, that gap adds up.

The second real decider is seat height. ADA chair height near 17" is a comfort and accessibility feature, not a luxury. The HOROW's 17.3" and the DeerValley's 17.5" claim serve older users and anyone with mobility limits far better than a standard-height bowl.

• Care most about water? Chase the lowest light-flush GPF.
• Care about comfort? Prioritise ADA chair height.
• Care about noise? The 28dB soft-close claim matters.

Flush type is a real factor for the best dual flush toilet, but it ranks below these two once every bowl in your shortlist clears waste reliably.

One-piece or two-piece: which should you buy?

This is the split that trips up most buyers. Five of my seven picks are complete toilets, and the divide between them is one-piece versus two-piece. Each shape suits a different situation.

A one-piece toilet, like the HOROW, both DeerValleys and the Swiss Madison, has the tank and bowl moulded together. There is no seam to leak or collect grime, and the low profile looks cleaner. The cost is weight: the Swiss Madison hits 109 lb as a single unit, which is awkward to carry and set.

A two-piece toilet, the Gerber Maxwell here, ships as separate tank and bowl. You handle each piece on its own, so no single lift is brutal. That makes it the easier install, especially solo or upstairs. The trade is the tank-to-bowl seam, which needs wiping and can eventually need a fresh gasket.

If you value seamless cleaning and looks, go one-piece. If you value an easier install and a lower entry price, the two-piece Gerber wins. Neither is better across the board. They answer different questions.

Can a repair kit make an old toilet dual flush?

A repair kit can make an old toilet dual flush, but only under strict conditions. Both the Senshare and houpeoro kits are built for this exact job, and both spell out the limits plainly.

The rules that decide whether a kit works for you:

1. Two-piece only. Both kits state they do not fit one-piece toilets. No exceptions.
2. Opening size. They fit flush valve openings from 3.2" to 3.6". Measure yours first.
3. Button hole. The tank lid hole must fall between 1.9" and 2.2".

If your toilet clears those three, a kit converts a single-flush tank into a half-and-full system for a fraction of a new toilet's price. Senshare cites a half flush around 0.8 to 1 gallon. That is a genuine water saving on an old 3-plus gallon fixture.

If your toilet fails any of the three, buy a complete unit instead. A kit that does not seat correctly leaks, and you have spent money to make the problem worse. Measure, then decide.

What the listings leave out

The specifications here are strong on flush and size, but thin in a few places worth knowing before you commit.

• Warranty gaps. Only three picks publish a warranty, all 1 year: the HOROW, the quiet DeerValley and the Swiss Madison. The DeerValley DV-1F0437 and the Gerber list none, and neither repair kit does.
• Seat height blanks. The Gerber Maxwell lists no seat-height figure, only an overall 17.5" tall dimension. If chair height is your priority, that is a blank you cannot fill from the listing.
• Flush wording. The HOROW lists dual flush as 1.1/1.1, which reads oddly for a dual system. Treat the light-flush figure as the reliable one.
• Availability of parts. Only the houpeoro kit shows more than one seller. Every other pick lists a single seller.

None of these are dealbreakers on their own. They are the details a listing photo hides, and knowing them keeps your expectations honest before the box arrives.

The verdict

If you want one answer, buy the HOROW T0338W. It lands the lowest light flush at 1.1 GPF, a 17.3" ADA chair height, and a compact 26.6" deep body, and it publishes a warranty. For most bathrooms, that combination is the best dual flush toilet here.

Now the two-track split. If your bathroom is small and you value accessible height, the HOROW is your pick. If cleaning is your main gripe, the DeerValley DV-1F0437 wins instead, because its rimless bowl removes the ledge where grime hides, and its 1/1.28 GPF split matches the HOROW on water while clearing strongly.

The cutoff is your existing toilet. If it is a two-piece tank with a 3.2" to 3.6" flush valve opening and it still works, skip a new toilet entirely and fit the Senshare or houpeoro kit. That converts it to dual flush for a fraction of the cost.

The Gerber Maxwell's exact advantage is handling: as the only two-piece, it installs in manageable pieces rather than one 99-plus-pound lift. That alone can decide the buy for a solo, upstairs install.

FAQ

Is a dual flush toilet worth it?

A dual flush toilet is worth it if you flush light loads often, which most households do. The light flush on these picks runs as low as 1 GPF, against 3-plus gallons on old single-flush toilets. DeerValley claims up to 16,500 gallons saved a year. Over time that trims your water bill, and the comfort features on the ADA-height picks add daily value.

What is the best dual flush toilet for a small bathroom?

The best dual flush toilet for a small bathroom is the HOROW T0338W. Its body measures 26 x 26.6 x 15 in, compact for a one-piece, while still offering an elongated bowl and 17.3" ADA seat height. The quiet DeerValley is even smaller at 24.6" wide, but it uses a round bowl and standard height, so it trades comfort for a tighter footprint.

Which dual flush toilet uses the least water?

Which dual flush toilet uses the least water depends on the light flush, the one you use most. The DeerValley DV-1F0437 claims the lowest light flush at 1 GPF, edging the HOROW's 1.1 GPF. On full flush, the DeerValley's 1.28 GPF also beats the 1.6 GPF of the quiet DeerValley and Swiss Madison, so it is the most frugal complete toilet in this set.

HOROW T0338W or DeerValley DV-1F0437?

Choosing the HOROW T0338W or DeerValley DV-1F0437 comes down to priority. The HOROW offers a more compact 26.6" footprint and a published 1 year warranty. The DeerValley counters with a rimless bowl that cleans more easily and a slightly lower 1 GPF light flush, but lists no warranty. Pick the HOROW for tight spaces and paper coverage, the DeerValley for easy cleaning.

Will a dual flush valve kit fit my toilet?

Whether a dual flush valve kit fits your toilet depends on three measurements. Both the Senshare and houpeoro kits fit two-piece toilets only, with flush valve openings from 3.2" to 3.6" and tank button holes from 1.9" to 2.2". Neither works on one-piece toilets. Measure your tank opening and lid hole before buying, because a kit outside that range will not seal.

Start by measuring your bathroom depth and your rough-in distance from the wall, then match those to the specs above. The HOROW T0338W is the right default because it solves the two hardest problems at once: it fits a small room at 26.6" deep, and it sits at an accessible 17.3" chair height, without forcing you into the heaviest body or the priciest tag. If your current two-piece toilet still works, measure the flush valve opening first. A kit may save you the whole purchase.

Last updated: October 6, 2026. Product availability re-checked.

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