Low-flow toilets use less water per flush, but the right choice depends on more than the gallons-per-flush figure: flush performance, bathroom fit, comfort, and maintenance all matter. I rank the TOTO Drake as the best overall for its Tornado Flush system and CEFIONTECT surface, while the DeerValley Symmetry stands out for dual-flush flexibility and the American Standard Yorkville FloWise for its low 1.1 GPF pressure-assisted design. The main tradeoffs are water use versus flushing power, one-piece styling versus easier service, and elongated comfort versus a smaller footprint. Rough-in dimensions and whether a seat is included can also change which model makes sense for your installation. Read on for the full comparison and advice on choosing among these 12 low-flow toilets.
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Key Takeaways
- The TOTO Drake is the strongest all-around match for buyers who want a recognizable flush system and a glazed surface, though its listed 1.6 GPF is higher than the dual-flush and 1.1 GPF options here.
- Dual flush is the clearest water-use differentiator among several DeerValley, Casta Diva, Gerber, and HOROW models; it gives buyers flush options, but the exact flush volumes should be checked for the specific model.
- The Yorkville FloWise makes the biggest water-saving claim at 1.1 GPF and uses pressure assistance, a distinct choice for buyers prioritizing low water use over a conventional gravity-flush setup.
- One-piece models dominate the compact and streamlined choices, while two-piece Gerber, TOTO, and American Standard models offer a more traditional tank-and-bowl format.
- Fit details can outweigh brand or style: this lineup includes round and elongated bowls, several comfort-height designs, a 10-inch rough-in model, and one American Standard option sold without a seat.
| DeerValley Symmetry One-Piece Toilet with Dual Flush |  | Best Overall | Type: One-piece, floor-mounted toilet | Flush system: Siphon dual flush | Water use: 1.1 GPF light flush; 1.6 GPF full flush | VIEW ON AMAZON | See Our Full Breakdown |
| Casta Diva Elongated One-Piece Toilet with 17-Inch Comfort Height Seat |  | Best for Comfort-Height Seating | Type: Elongated one-piece toilet | Flush system: Dual flush | Water use: 1.1 GPF for liquids; 1.6 GPF for solids | VIEW ON AMAZON | See Our Full Breakdown |
| Gerber Viper Force Elongated Two-Piece Toilet with Soft-Close Seat, White |  | Best Two-Piece Low-Flow Pick | Type: Two-piece toilet | Flush rate: 1.28 GPF | Bowl shape: Elongated | VIEW ON AMAZON | See Our Full Breakdown |
| Casta Diva Elongated One-Piece Toilet with 17.2-Inch Comfort Height |  | Best Ultra-Low-Volume Flush | Type: One-piece, floor-mounted toilet | Flush rate: 1.0 GPF | Flush system: Air-pressure-assisted siphon flush | VIEW ON AMAZON | See Our Full Breakdown |
| DeerValley Compact One-Piece Toilet with Soft-Close Seat, Dual Flush, White |  | Best for Small Bathrooms | Type: One-piece toilet | Bowl shape: Round | Flush system: Dual flush | VIEW ON AMAZON | See Our Full Breakdown |
| Gerber Maxwell Select Round Two-Piece Dual-Flush Toilet, White |  | Best for Low-Volume Flush Choice | Flush rate: Dual flush: 1.0 and 1.28 GPF | Bowl shape: Round | Configuration: Two-piece | VIEW ON AMAZON | See Our Full Breakdown |
| American Standard Colony 3 Two-Piece Elongated Toilet, 10-Inch Rough-In, White (Less Seat) |  | Best for a 10-Inch Rough-In | Flush rate: 1.28 GPF (4.8 Lpf) | Certification: WaterSense | Rough-in: 10 inches | VIEW ON AMAZON | See Our Full Breakdown |
| DeerValley Compact One-Piece Toilet with Dual Flush and Soft-Close Seat |  | Best for Tight Bathrooms | Dimensions: 24.5 × 13.38 × 28.38 inches | Flush system: Dual flush: 1.1 and 1.6 GPF | Rough-in: 10 inches | VIEW ON AMAZON | See Our Full Breakdown |
| TOTO Drake Two-Piece Elongated Universal Height Toilet with Tornado Flush and CEFIONTECT, 1.6 GPF, Cotton White |  | Best for Bowl-Rinsing Features | Flush rate: 1.6 GPF | Flush system: TORNADO FLUSH | Glaze: CEFIONTECT | VIEW ON AMAZON | See Our Full Breakdown |
| HOROW T0338W One-Piece Elongated Toilet, 17.3-Inch Chair Height, Dual Flush |  | Best for Chair-Height Dual Flush | Flush type: Dual flush: 1.1 and 1.6 GPF | Bowl shape: Elongated | Seat height: 17.3 inches | VIEW ON AMAZON | See Our Full Breakdown |
| DeerValley Elongated One-Piece Toilet with Dual Flush |  | Best for Easy-Clean Water Savings | Flush system: Dual flush, 1.1/1.6 GPF | Bowl shape: Elongated | Rough-in: 12 inches | VIEW ON AMAZON | See Our Full Breakdown |
| American Standard Yorkville FloWise Elongated Pressure-Assisted Toilet, 1.1 GPF, White |  | Best for Back-Outlet Installations | Flush rate: 1.1 GPF (4.2 LPF) | Flush system: Pressure-assisted siphon jet | Outlet: Back outlet | VIEW ON AMAZON | See Our Full Breakdown |
| lowflow toilet | Dimensions | Flush system | Material | Bowl shape |
|---|---|---|---|---|
| DeerValley Symmetry One-Piece | 26.6 × 17 × 27.01 in (D × W × H) | Siphon dual flush | Ceramic | — |
| Casta Diva Elongated One-Piece | 27.17 × 14.37 × 25.39 in (D × W × H) | Dual flush | Ceramic | — |
| Gerber Viper Force Elongated T | 29.5 × 16.5 × 31.75 in (D × W × H) | — | Vitreous china | Elongated |
| Casta Diva Elongated One-Piece | 26.9 in D × 15 in W × 19.3 in H | Air-pressure-assisted siphon flush | Vitreous china | — |
| DeerValley Compact One-Piece T | — | Dual flush | — | Round |
| Gerber Maxwell Select Round Tw | 27.25 × 17.13 × 31 inches (D × W × H) | — | — | Round |
| American Standard Colony 3 Two | 29.75 × 18.69 × 28.44 inches (D × W × H) | — | — | Elongated |
| DeerValley Compact One-Piece T | 24.5 × 13.38 × 28.38 inches | Dual flush: 1.1 and 1.6 GPF | Ceramic | — |
| TOTO Drake Two-Piece Elongated | — | TORNADO FLUSH | — | Elongated |
| HOROW T0338W One-Piece Elongat | 26.6 × 15 × 26 inches | — | Ceramic | Elongated |
| DeerValley Elongated One-Piece | 28.75 × 14 × 28 inches | Dual flush, 1.1/1.6 GPF | Ceramic | Elongated |
| American Standard Yorkville Fl | 29.25 × 20.5 × 29.75 inches | Pressure-assisted siphon jet | Porcelain | Elongated |
More Details on Our Top Picks
DeerValley Symmetry One-Piece Toilet with Dual Flush
The DeerValley Symmetry is a balanced choice for buyers who want water savings without giving up an elongated bowl or a one-piece design. Its 1.1/1.6 GPF dual flush lets users choose a lower-volume flush for liquids and a higher-volume option for solids. Compared with the DeerValley Compact One-Piece, it has an elongated seat rather than a round bowl, but it projects farther into the room. The skirted exterior cuts down on exposed curves that collect dust, and the soft-close, quick-release seat makes routine cleaning easier. At 97 pounds, though, it is a substantial fixture to position, and its 12-month warranty is relatively short. I’d choose it for a compact bathroom where comfort and easy exterior cleaning matter as much as low water use.
Pros:- Dual-flush options use 1.1 GPF for light flushes and 1.6 GPF for full flushes.
- Elongated seat offers a roomier shape than round-bowl compact models.
- Skirted one-piece exterior is easier to wipe down.
- Soft-close, quick-release seat is included.
Cons:- At 97 pounds, it may be difficult for one person to move and install.
- Its 26.6-inch projection takes more floor space than the DeerValley Compact One-Piece.
- The included warranty lasts 12 months.
Best for: Households seeking an elongated-bowl, dual-flush one-piece toilet for a smaller bathroom with enough space for its 26.6-inch projection.
Not ideal for: Solo installers or buyers who need the shortest possible toilet; its 97-pound weight can complicate handling, and its projection is longer than the round-bowl DeerValley Compact.
- Type:One-piece, floor-mounted toilet
- Flush system:Siphon dual flush
- Water use:1.1 GPF light flush; 1.6 GPF full flush
- Bowl and seat shape:Elongated
- Dimensions:26.6 × 17 × 27.01 in (D × W × H)
- Weight:97 lb
- Material:Ceramic
- Warranty:12 months
Our verdict“Choose the Symmetry if you want an easy-clean, elongated dual-flush toilet and can accommodate its weight and projection.”
Casta Diva Elongated One-Piece Toilet with 17-Inch Comfort Height Seat
The Casta Diva CD-T005 is the clearest fit here for buyers prioritizing a higher seat alongside low-flow performance. Its 17-inch seat height can make sitting down and standing up more comfortable than on a lower bowl, while the 1.1/1.6 GPF dual flush offers separate volumes for liquids and solids. Like the DeerValley Symmetry, it pairs an elongated bowl with a skirted one-piece body, but this model is narrower at 14.37 inches; its 12-inch rough-in requirement still needs to match the existing plumbing. The fully glazed trapway is intended to support smoother waste passage, and the quick-release seat helps with cleaning. The tradeoff is a one-year limited service warranty, plus a taller seat may not suit every household. I’d favor it over the Gerber Viper Force for buyers who want dual-flush selection and a one-piece profile.
Pros:- 17-inch seat height provides a higher sitting position than many standard-height toilets.
- Dual flush uses 1.1 GPF for liquids and 1.6 GPF for solids.
- Skirted one-piece design and quick-release seat simplify cleaning.
- Fully glazed trapway is designed to support waste movement.
Cons:- Requires a standard 12-inch rough-in.
- The limited service warranty is one year.
- The 17-inch seat may feel too high for children or users who prefer a lower seat.
Best for: Adults who prefer a 17-inch seat and want an elongated, skirted toilet with separate low-volume and full-flush options.
Not ideal for: Buyers with a nonstandard rough-in, households that prefer a lower seat, or anyone seeking a long service warranty.
- Type:Elongated one-piece toilet
- Flush system:Dual flush
- Water use:1.1 GPF for liquids; 1.6 GPF for solids
- Seat height:17 in
- Rough-in:12 in
- Dimensions:27.17 × 14.37 × 25.39 in (D × W × H)
- Material:Ceramic
- Warranty:1-year limited customer service; lifetime technical consulting
Our verdict“Pick the CD-T005 if a higher seat and adjustable flush volume matter more than an extended warranty.”
Gerber Viper Force Elongated Two-Piece Toilet with Soft-Close Seat, White
The Gerber Viper Force takes a simpler approach to water efficiency: one 1.28 GPF flush rather than the selectable volumes offered by the Casta Diva CD-T005 or DeerValley Symmetry. That makes the flush choice straightforward, though it gives users less control over water per use. Its glazed trapway is designed to help prevent clogs, a useful feature for households that put a premium on dependable passage through the bowl. The two-piece construction can be easier to handle in separate sections than a one-piece toilet, but the assembled fixture still weighs 78.2 pounds and measures 31.75 inches tall. A tool-free removable soft-close seat supports easier cleaning, and the wax ring and installation hardware are included. I’d choose this over the dual-flush models when a conventional two-piece design and fixed high-efficiency flush are the priority.
Pros:- Uses 1.28 gallons per flush.
- Glazed trapway is designed to help prevent clogs.
- Tool-free removable soft-close seat supports easier cleaning.
- Wax ring and installation hardware are included.
Cons:- A single flush volume offers less water-use choice than dual-flush alternatives.
- At 78.2 pounds, it remains a heavy fixture to handle.
- Its 31.75-inch height may be a poor fit where vertical clearance is limited.
Best for: Buyers replacing a standard two-piece toilet who want a fixed 1.28 GPF flush, an elongated bowl, and a removable seat.
Not ideal for: Households wanting a lower-volume light flush option or a compact one-piece profile; the dual-flush DeerValley and Casta Diva models offer more control over water use.
- Type:Two-piece toilet
- Flush rate:1.28 GPF
- Bowl shape:Elongated
- Dimensions:29.5 × 16.5 × 31.75 in (D × W × H)
- Weight:78.2 lb
- Material:Vitreous china
- Seat:Polypropylene, soft-close, tool-free removable
- Included installation items:Installation hardware and wax ring
Our verdict“Choose the Viper Force if you want a straightforward 1.28 GPF two-piece toilet rather than dual-flush controls.”
Casta Diva Elongated One-Piece Toilet with 17.2-Inch Comfort Height
With a listed flush rate of 1.0 GPF, this Casta Diva is the lowest-volume option in this group. Its air-pressure-assisted siphon system is designed to generate flushing action without electricity, so it doesn’t depend on a power connection. Foot-kick or side-button controls give buyers a choice of operation, unlike the simple single flush on the Gerber Viper Force. The 17.2-inch comfort-height bowl and elongated shape suit users who prefer a higher seat, while the skirted vitreous china base gives it a cleaner exterior profile than a two-piece toilet. The tradeoffs are a standard 12-inch rough-in requirement and no dual-flush option to tailor water use by waste type. Its listed dimensions also warrant checking against the installation space before ordering. I’d put it ahead of the DeerValley Symmetry only for buyers who value minimum stated flush volume above selectable flushes.
Pros:- Listed 1.0 GPF flush rate is lower than the other toilets in this batch.
- Air-pressure-assisted system operates without electricity.
- Foot-kick and side-button controls provide two operating options.
- 17.2-inch seat height, quiet-close seat, and skirted base are included.
Cons:- Single flush volume offers no separate light-flush setting like the DeerValley Symmetry.
- Requires a standard 12-inch rough-in.
- The listed height and dimensions should be checked carefully against the intended installation space.
Best for: Water-conscious households seeking a 1.0 GPF toilet with a higher elongated seat and non-electric foot-kick operation.
Not ideal for: Buyers who want separate light and full flush volumes, have a nonstandard rough-in, or need dimensions confirmed carefully for a tight installation.
- Type:One-piece, floor-mounted toilet
- Flush rate:1.0 GPF
- Flush system:Air-pressure-assisted siphon flush
- Flush controls:Foot-kick or side button
- Seat height:17.2 in
- Rough-in:12 in
- Dimensions:26.9 in D × 15 in W × 19.3 in H
- Material:Vitreous china
Our verdict“Choose this Casta Diva if the lowest stated water use and non-electric flush operation outweigh the flexibility of dual flush.”
DeerValley Compact One-Piece Toilet with Soft-Close Seat, Dual Flush, White
The DeerValley Compact is the space-saving pick: its 24.6-inch projection and round bowl use less front-to-back room than the elongated DeerValley Symmetry. Its 0.8/1.28 GPF dual-flush system also uses less water per listed flush than that model’s 1.1/1.6 GPF options, making it the strongest fit here when both bathroom space and water use are priorities. The nearly 17-inch seat height is relatively tall for a compact round-bowl toilet, though the shorter seat length won’t feel as spacious as an elongated bowl. A removable soft-close seat and skirted trapway simplify cleaning access. The main fit constraint is its 12-inch rough-in, so it won’t suit every existing plumbing layout. I’d choose it over the Gerber Viper Force for a tight bathroom, but not for buyers who value an elongated bowl most.
Pros:- 24.6-inch projection helps conserve floor space.
- Dual-flush volumes are 0.8 and 1.28 GPF.
- Round bowl is more compact than the elongated bowls on the Symmetry and Viper Force.
- Removable soft-close seat and skirted trapway aid cleaning.
Cons:- Round bowl provides less front-to-back seating room than elongated alternatives.
- Requires a 12-inch rough-in.
- Nearly 17-inch seat height may feel tall for some users despite the compact bowl.
Best for: Owners of small bathrooms who need a short-projection toilet and want dual-flush water use as low as 0.8 GPF.
Not ideal for: Buyers who prefer an elongated bowl or have a rough-in other than 12 inches; the compact round shape trades some seating room for floor space.
- Type:One-piece toilet
- Bowl shape:Round
- Flush system:Dual flush
- Water use:0.8 / 1.28 GPF
- Projection:24.6 in
- Seat height:Nearly 17 in
- Rough-in:12 in
- Included components:Pre-installed soft-close seat, water fitting, wax ring, floor bolts, installation instructions
Our verdict“Pick the DeerValley Compact when limited bathroom space and low dual-flush volumes matter more than an elongated bowl.”
Gerber Maxwell Select Round Two-Piece Dual-Flush Toilet, White
I’d choose the Gerber Maxwell Select when using less water per flush is the main goal: its dual-flush controls offer 1.0 and 1.28 GPF, both below the HOROW T0338W’s 1.1/1.6 GPF options. The glazed trapway is designed to resist clogs, while the included soft-close seat, wax ring, and tool-free installation kit reduce the number of parts to source separately. Its round bowl can also suit a tighter bathroom better than the elongated American Standard Colony 3. The tradeoff is that a round bowl offers less sitting room, and the listed information does not give a WaterSense certification. I’d favor it for compact spaces and adjustable water use, not for buyers who want an elongated bowl or documented certification.
Pros:- Dual-flush choices of 1.0 and 1.28 GPF support lower water use.
- Round bowl can fit spaces where an elongated toilet is less suitable.
- Soft-close seat, wax ring, and tool-free installation kit are included.
- Glazed trapway is designed to help resist clogs.
Cons:- Round bowl provides less seating room than elongated options such as the Colony 3.
- WaterSense certification is not specified in the supplied product information.
- The dual-flush controls offer less water-volume flexibility than models with a 1.6 GPF option.
Best for: Households seeking a round-bowl toilet with a low-volume flush option and installation accessories included.
Not ideal for: Buyers who prefer an elongated bowl, need a listed WaterSense certification, or want more assurance from a larger body of customer feedback.
- Flush rate:Dual flush: 1.0 and 1.28 GPF
- Bowl shape:Round
- Configuration:Two-piece
- Dimensions:27.25 × 17.13 × 31 inches (D × W × H)
- Weight:80.5 pounds
- Color:White
- Included components:Soft-close seat, wax ring, installation hardware, and tool-free installation kit
- Trapway:Glazed; designed for clog-resistant performance
Our verdict“Choose the Maxwell Select for a compact round toilet with especially low dual-flush volumes and key installation parts included.”
American Standard Colony 3 Two-Piece Elongated Toilet, 10-Inch Rough-In, White (Less Seat)
The American Standard Colony 3 is the clearest fit here for a bathroom with a 10-inch rough-in and a preference for a conventional elongated bowl. Its 1.28 GPF flush is WaterSense certified, while the 3-inch flush valve, 2-inch trapway, and PowerWash rim are designed to move waste and wash the bowl efficiently. Compared with the Gerber Maxwell Select, it lacks a lower-volume 1.0 GPF setting but adds a stated certification and more room in the bowl. The key catch is fit: its 10-inch rough-in is not interchangeable with the 12-inch HOROW T0338W configuration. It also arrives without a seat, so buyers need to plan for that separate purchase and installation.
Pros:- WaterSense-certified flush uses 1.28 GPF.
- 10-inch rough-in serves bathrooms that do not fit common 12-inch models.
- PowerWash rim is designed to scrub the bowl during flushing.
- 3-inch flush valve and 2-inch trapway support efficient clearing.
Cons:- Requires a 10-inch rough-in, limiting compatibility with other bathroom layouts.
- Toilet seat is not included.
- Does not offer a lower-volume dual-flush setting like the Gerber Maxwell Select.
Best for: Homeowners replacing a toilet in a bathroom with a 10-inch rough-in who want an elongated bowl and a WaterSense-certified 1.28 GPF flush.
Not ideal for: Buyers with a 12-inch or other rough-in layout, or anyone seeking a complete toilet set with the seat included.
- Flush rate:1.28 GPF (4.8 Lpf)
- Certification:WaterSense
- Rough-in:10 inches
- Bowl shape:Elongated
- Configuration:Two-piece, floor-mounted
- Flush valve:3 inches
- Trapway:2 inches
- Dimensions:29.75 × 18.69 × 28.44 inches (D × W × H)
- Seat:Not included
Our verdict“Pick the Colony 3 when your bathroom needs a 10-inch rough-in and you want an elongated, WaterSense-certified toilet, provided you’re ready to supply a seat.”
DeerValley Compact One-Piece Toilet with Dual Flush and Soft-Close Seat
At 24.5 inches deep, this DeerValley is the most space-focused choice in this group, pairing compact dimensions with a skirted one-piece body that leaves fewer exterior crevices to clean. Its dual flush uses 1.1 or 1.6 GPF, so it gives buyers a reduced-volume option but uses more water on its full flush than the Gerber Maxwell Select’s 1.28 GPF maximum. The included soft-close seat and installation kit make it a more complete package than the American Standard Colony 3, which is sold without a seat. The compromises are a standard-height bowl and a required 10-inch rough-in. I’d choose it for limited floor space, but not for taller users seeking chair height or anyone whose plumbing is set up for a different rough-in.
Pros:- Compact 24.5-inch depth suits bathrooms with limited floor space.
- Dual-flush options provide 1.1 and 1.6 GPF settings.
- Skirted one-piece design can make exterior cleaning simpler.
- Soft-close seat and installation kit are included.
Cons:- Standard seat height may be less comfortable for users who prefer a taller toilet.
- Requires a 10-inch rough-in.
- Its 1.6 GPF full flush uses more water than the 1.28 GPF maximum on the Gerber Maxwell Select.
Best for: Owners of small bathrooms with a 10-inch rough-in who want a compact one-piece toilet and a lower-volume flush option.
Not ideal for: Taller users who prefer a chair-height seat, households seeking the lowest available flush volumes, or buyers with a rough-in other than 10 inches.
- Dimensions:24.5 × 13.38 × 28.38 inches
- Flush system:Dual flush: 1.1 and 1.6 GPF
- Rough-in:10 inches
- Bowl:Standard-height, round
- Configuration:One-piece, floor-mounted
- Material:Ceramic
- Weight:78 pounds
- Included components:Soft-close seat, pre-assembled valve, wax ring, bolts, wrench, and manual
- Warranty:1 year
Our verdict“Choose this DeerValley when compact dimensions and an easier-to-clean skirted body matter more than chair-height seating or the lowest full-flush volume.”
TOTO Drake Two-Piece Elongated Universal Height Toilet with Tornado Flush and CEFIONTECT, 1.6 GPF, Cotton White
The TOTO Drake puts more emphasis on bowl rinsing and user comfort than on the lowest possible water use. Its Tornado Flush and CEFIONTECT glaze are designed to rinse the bowl and reduce waste sticking, while the elongated, ADA-compliant universal-height bowl may suit users who find lower toilets harder to use. Its 1.6 GPF rate is higher than the Colony 3’s certified 1.28 GPF and both settings on the Gerber Maxwell Select, so I’d rank it for its wash and accessibility features rather than maximum water savings. The purchase also leaves several essentials to source separately: the seat, wax ring, mounting bolts, and water supply lines. Check for at least 8 psi flowing pressure and a 12-inch rough-in before choosing it.
Pros:- Tornado Flush is designed to rinse the bowl with a swirling water action.
- CEFIONTECT glaze helps reduce waste sticking to the bowl surface.
- Universal-height, ADA-compliant bowl may be easier to sit down on and stand up from.
- Elongated bowl offers more seating room than the round Gerber Maxwell Select.
Cons:- Its 1.6 GPF flush uses more water than the 1.28 GPF Colony 3 and the Maxwell Select’s settings.
- Seat, wax ring, mounting bolts, and water supply lines are sold separately.
- Requires a 12-inch rough-in and at least 8 psi flowing water pressure.
Best for: Buyers who prioritize an ADA-compliant universal-height elongated bowl and bowl-rinsing features over the lowest flush volume.
Not ideal for: Water-conservation-focused households seeking a flush below 1.6 GPF, or buyers who need a seat and installation supplies included.
- Flush rate:1.6 GPF
- Flush system:TORNADO FLUSH
- Glaze:CEFIONTECT
- Bowl shape:Elongated
- Height:Universal Height; ADA compliant
- Rough-in:12 inches
- Trap seal:2-1/8 inches
- Minimum water pressure:8 psi flowing
- Sold separately:Seat, wax ring, mounting bolts, and water supply lines
Our verdict“Choose the Drake for its universal-height bowl and specialized rinsing features if its 1.6 GPF rate and separately sourced installation parts suit your priorities.”
HOROW T0338W One-Piece Elongated Toilet, 17.3-Inch Chair Height, Dual Flush
The HOROW T0338W pairs two features that are not always found together in this lineup: an elongated bowl at 17.3-inch seat height and dual flush at 1.1 or 1.6 GPF. That makes it a more comfort-oriented alternative to the compact DeerValley, whose round bowl is standard height, while still giving buyers a lower-volume flush choice. The skirted one-piece construction and included soft-close seat and installation hardware add convenience, but the 99.2-pound body may be harder to position than the lighter DeerValley. Buyers must also select the correct 10- or 12-inch rough-in version before ordering. Its 1.6 GPF full flush is less water-focused than the Colony 3’s fixed 1.28 GPF.
Pros:- 17.3-inch seat height can make sitting down and standing up easier.
- Dual flush offers 1.1 and 1.6 GPF settings.
- Skirted one-piece design has a smooth exterior that is easier to clean around.
- Soft-close seat and installation hardware are included.
Cons:- At 99.2 pounds, it may be difficult to move and install.
- Rough-in must match the bathroom; 10-inch and 12-inch versions are offered.
- The 1.6 GPF full flush uses more water than the American Standard Colony 3’s 1.28 GPF flush.
Best for: Households wanting an elongated, chair-height toilet with dual-flush controls and a seat included.
Not ideal for: Buyers who need the lowest full-flush volume, cannot handle a heavy one-piece installation, or have not confirmed their rough-in measurement.
- Flush type:Dual flush: 1.1 and 1.6 GPF
- Bowl shape:Elongated
- Seat height:17.3 inches
- Dimensions:26.6 × 15 × 26 inches
- Weight:99.2 pounds
- Trapway:Fully glazed, 2 inches
- Rough-in options:10-inch or 12-inch
- Material:Ceramic
- Warranty:1-year limited warranty
Our verdict“Pick the HOROW if chair-height comfort and an elongated dual-flush bowl outweigh its heavier installation and higher-volume full flush.”
DeerValley Elongated One-Piece Toilet with Dual Flush
The DeerValley pairs a 1.1/1.6 GPF dual flush with an elongated bowl, letting households use the lower-volume flush for lighter waste and the higher setting when needed. Its skirted one-piece design has fewer exposed contours to clean than a conventional two-piece toilet, including the Gerber Maxwell Select. The elongated shape also favors seated comfort over the compact footprint of DeerValley’s compact models. The tradeoff is that the supplied details do not identify a seat-closing feature or a flush-performance certification, so buyers comparing it with the WaterSense-listed American Standard Yorkville FloWise have less documented water-efficiency guidance. At 28.75 inches long, it also needs more room than a round-bowl option. This is a practical fit for shoppers who value a tidy exterior and a choice of flush volumes.
Pros:- Dual-flush settings offer 1.1 and 1.6 GPF options.
- Skirted one-piece form reduces hard-to-reach exterior crevices.
- Elongated bowl provides more seated room than round-bowl models.
- Ceramic construction and standard-height design suit everyday use.
Cons:- Its elongated 28.75-inch length may not suit tight bathrooms.
- The supplied specifications do not state WaterSense certification.
- No seat-closing feature is specified.
Best for: Households seeking a skirted, elongated toilet with two flush-volume choices and a 12-inch rough-in.
Not ideal for: Buyers who need a compact round-bowl toilet, documented WaterSense certification, or a stated soft-close seat.
- Flush system:Dual flush, 1.1/1.6 GPF
- Bowl shape:Elongated
- Rough-in:12 inches
- Dimensions:28.75 × 14 × 28 inches
- Material:Ceramic
- Installation:Floor mounted
- Seat material:Polypropylene
- Color:Solid white
Our verdict“Choose this DeerValley if you want an easy-clean, elongated toilet with selectable flush volumes and have room for its longer bowl.”
American Standard Yorkville FloWise Elongated Pressure-Assisted Toilet, 1.1 GPF, White
The Yorkville FloWise is the lineup’s specialized low-flow choice for bathrooms with a back-outlet connection. Its 1.1 GPF pressure-assisted siphon jet combines low water use with a forceful flush mechanism, while the listed WaterSense qualification gives buyers a clear efficiency benchmark. That makes it a different proposition from the DeerValley Elongated One-Piece, whose dual flush offers a higher-volume setting but is not listed here as WaterSense certified. The Yorkville’s fixed 1.1 GPF rate is less adjustable, and its installation requirement sharply limits who can use it: it is not a straightforward replacement for a typical floor-outlet toilet. The seat is also sold separately. I’d shortlist it when the plumbing already matches and low water use is the priority, but not for a standard-outlet bathroom renovation.
Pros:- Uses 1.1 GPF and is listed as meeting EPA WaterSense criteria.
- Pressure-assisted siphon jet is designed to support a forceful flush at low volume.
- Back outlet can suit bathrooms built around rear-discharge plumbing.
- EverClean surface is specified for the porcelain bowl.
Cons:- Back-outlet installation is incompatible with many standard toilet connections.
- Seat is not included.
- Single 1.1 GPF rate provides no higher-volume flush option.
Best for: Owners replacing a back-outlet toilet who want a documented 1.1 GPF, WaterSense-qualified flush.
Not ideal for: Buyers with a standard floor-outlet rough-in or anyone wanting a seat included in the purchase.
- Flush rate:1.1 GPF (4.2 LPF)
- Flush system:Pressure-assisted siphon jet
- Outlet:Back outlet
- Bowl shape:Elongated
- Installation:Floor mounted
- Material:Porcelain
- Surface:EverClean
- Dimensions:29.25 × 20.5 × 29.75 inches
- Seat included:No
Our verdict“Choose the Yorkville FloWise when you need a back-outlet toilet and want its fixed 1.1 GPF WaterSense-qualified flush; skip it for standard outlet plumbing.”
How We Picked
I compared these toilets around the decisions that affect daily use: stated water use and flush type, bowl shape, seat height, one-piece versus two-piece construction, and installation details such as rough-in size and included seat. I gave weight to useful distinctions rather than treating every low-flow label as equivalent. A dual-flush model offers a different water-use choice from a single-flush 1.6 GPF toilet, while the Yorkville’s 1.1 GPF pressure-assisted system serves a narrower efficiency-first need.
The ranking favors clear everyday versatility, then rewards models with a distinct advantage for particular bathrooms or buyers. The TOTO Drake leads for its named flush and surface technologies, while dual-flush DeerValley picks rank well for choice and compact configurations. I place models lower when their defining benefit is narrower, or when fit and ownership details—such as a 10-inch rough-in or a seat sold separately—make them less straightforward for a typical replacement. I do not assume that low water use alone guarantees strong performance; buyers should check the full specifications and installation requirements for their bathroom.
| lowflow toilet | Material | Bowl shape |
|---|---|---|
| DeerValley Symmetry One-Piece | Ceramic | — |
| Casta Diva Elongated One-Piece | Ceramic | — |
| Gerber Viper Force Elongated T | Vitreous china | Elongated |
| Casta Diva Elongated One-Piece | Vitreous china | — |
| DeerValley Compact One-Piece T | — | Round |
| Gerber Maxwell Select Round Tw | — | Round |
| American Standard Colony 3 Two | — | Elongated |
| DeerValley Compact One-Piece T | Ceramic | — |
| TOTO Drake Two-Piece Elongated | — | Elongated |
| HOROW T0338W One-Piece Elongat | Ceramic | Elongated |
| DeerValley Elongated One-Piece | Ceramic | Elongated |
| American Standard Yorkville Fl | Porcelain | Elongated |
Factors to Consider When Choosing Lowflow Toilets
Low-flow toilet shopping is easiest when I start with the bathroom and household, then compare water use and flush design. These broader checks can prevent a model that looks right on paper from becoming an awkward installation or a poor fit for daily routines.
Match Water Use to Flush Design
Gallons per flush is only one part of the decision: flush mechanism and bowl design influence how a toilet clears waste. A dual-flush control lets users choose between flush options, but check the manufacturer’s stated volume for each setting rather than assuming every dual-flush model uses the same amount. A low single-flush figure, such as 1.1 GPF, may appeal to water-conscious households, yet the pressure-assisted mechanism can feel and sound different from gravity flush. If your home has older plumbing or several users with different preferences, prioritize clear performance specifications and installation guidance. Avoid choosing solely by the smallest number on the spec sheet.
Measure Rough-In and Available Space
Measure from the finished wall to the center of the floor drain, and check the product’s rough-in requirement before ordering. The American Standard Colony 3 in this lineup specifies a 10-inch rough-in, a detail that can make it suitable for a bathroom that does not match the common configuration. Also measure clearance in front of the bowl, space beside it, and the distance to nearby doors or vanities. Round bowls can suit tighter rooms, while elongated bowls generally take up more front-to-back space. Do not rely on an old toilet’s visible shape alone: trim, flooring, and the drain position can affect the replacement fit.
Choose Bowl Shape and Seat Height for Users
Elongated bowls provide more sitting room but need more clearance, so they tend to suit bathrooms where space is available. Round bowls can make more sense in a compact powder room or a narrow layout. Comfort-height options may make sitting down and standing up easier for some adults, but the fit can feel too tall for children or shorter users. Check whether the stated height refers to the bowl rim or the seat, since listings may describe these measurements differently. If the toilet serves a household with varied needs, prioritize a height that works for the people who use it most rather than selecting by label alone.
Weigh One-Piece Against Two-Piece Construction
One-piece toilets combine the tank and bowl into a single unit, creating a more integrated look and fewer visible joints to clean. They can be heavier and more awkward to move, so delivery access and installer capacity matter. Two-piece models separate the tank from the bowl, which can simplify carrying or replacing a component, though the joint adds a cleaning area. Neither format automatically flushes better; compare the actual flush system and specifications. Choose based on bathroom access, preferred appearance, and the kind of maintenance you are comfortable handling.
Check What Is Included and What Needs Service
Before buying, verify whether the seat, supply line, wax ring, bolts, and other installation parts are included; product names do not always tell the full story. The American Standard Colony 3 listing here is explicitly sold without a seat, so that adds a separate fit and compatibility decision. Soft-close seats can reduce lid noise, but a proprietary or model-specific seat may be harder to replace than a standard one. Look for replacement-part availability for flush valves, fill valves, and seals, especially on dual-flush or pressure-assisted designs. A toilet that saves water can still be a poor long-term fit if routine parts are difficult to source.
Decide When a Premium Feature Is Worth It
Paying more for a named flush system, a treated bowl surface, or a particular construction style makes sense when the feature addresses a real household priority. A surface treatment may help limit residue, but it does not remove the need for regular cleaning. A pressure-assisted toilet may suit buyers focused on very low water use, while someone seeking a familiar, straightforward replacement may prefer a conventional gravity-flush model. Consider the full ownership picture: installation complexity, service access, replacement components, and the cost of any missing accessories. Skip extra features that do not solve a fit, cleaning, or usability problem in your bathroom.
Frequently Asked Questions
Is the lowest-GPF toilet in this roundup automatically the best choice?
No. The Yorkville FloWise is listed at 1.1 GPF, but its pressure-assisted flush is a specific design choice, not a universal upgrade for every household. The TOTO Drake uses 1.6 GPF and may appeal more to buyers who value its Tornado Flush and CEFIONTECT features. Dual-flush models offer a different way to manage water use across flush types. Compare the stated flush volumes, mechanism, installation needs, and user preferences rather than choosing by GPF alone.
Should I choose dual flush or a single-flush toilet?
Dual flush is useful when household members will consistently select the appropriate flush, since the control gives them two options. It may be less appealing if users prefer a simple single-button routine or find the controls confusing. Check each model’s exact flush volumes and whether the controls are clearly marked, because dual-flush labels do not establish how much water each setting uses. A single-flush model can be simpler to operate, but its per-flush use is fixed. Your best choice depends on how the toilet will be used day to day, not just the number of flush options.
Will a comfort-height toilet fit every adult in my household?
Not necessarily. Comfort-height designs can make transfers easier for many adults, but a taller seat may feel less comfortable for shorter users or children. Listings in this roundup include different stated heights, and the listed figure may refer to the bowl or the seat, so confirm the measurement with the manufacturer. If several people share the bathroom, compare the intended seat height with their needs before choosing. A showroom visit or a careful height comparison with the current toilet can help reduce guesswork.
How can I tell whether one of these toilets will fit my existing plumbing?
Measure the rough-in from the finished wall to the drain center and compare it with the exact model’s installation sheet. The Colony 3 listed here calls for a 10-inch rough-in, so it should not be treated as a drop-in replacement for a different rough-in size. Check the supply-line position, floor clearance, bowl projection, and door or vanity clearance as well. Older bathrooms may have unusual dimensions or flooring that changes the measurement from the wall. If measurements are uncertain, ask a plumber to confirm them before ordering.
What should I do if the toilet listing says the seat is not included?
Confirm the required seat shape, mounting style, and compatibility before choosing a separate seat. The Colony 3 is specifically listed without a seat, so buyers should plan for that additional purchase and installation step. Check whether the toilet’s stated height assumes a seat and whether the replacement seat changes the final sitting height. A soft-close seat is a separate preference, not a feature to assume from the toilet name. Reviewing the included-parts list can prevent a delayed installation after the toilet arrives.
Conclusion
For the broadest mix of named flush and bowl-surface features, I recommend the TOTO Drake as best overall, while noting its 1.6 GPF specification. For a flexible water-use setup, the DeerValley Symmetry is my best value-style pick among the dual-flush options, subject to checking its exact flush volumes and included parts. Buyers who want a low stated flush volume can look at the American Standard Yorkville FloWise as the efficiency-focused pick; its pressure-assisted design makes it a more specialized choice. For a more straightforward starting point, I’d compare the two-piece Gerber options and choose by bowl shape and flush controls, while compact bathrooms should focus on the round Gerber Maxwell Select or the DeerValley compact models. If seat height, a 10-inch rough-in, or an included seat is a deciding factor, verify those measurements and package details before selecting any model.
