Choosing a water-efficient toilet is about more than finding the lowest gallons-per-flush figure. Flush performance, bowl shape, seat height, plumbing fit, and the number of flush options all affect whether a toilet works well in your home. These five picks include a dual-flush model, several 1.28-gallon-per-flush toilets, and a smart toilet with two water-saving flush settings.
Table of Contents
Quick Comparison
| Toilet | Water Use | Notable Feature | Best For |
|---|---|---|---|
| TOTTE Smart Toilet with Bidet | 0.92 or 1.28 GPF | Smart bidet features and multiple flush controls | People wanting a feature-rich, tankless toilet |
| DeerValley Elongated One-Piece Toilet | 1.1 or 1.6 GPF | Dual-flush system and skirted design | Shoppers who want two flush choices |
| Gerber Avalanche Select | 1.28 GPF | WaterSense certification and chair-height bowl | Those seeking a certified, conventional two-piece toilet |
| Simple Project 21-Inch Extra Tall Toilet | 1.28 GPF | Extra-tall bowl and elongated shape | Taller users or people who need a raised seat |
| Garvee ADA-Compliant Elongated Toilet | 1.28 GPF | 16-inch comfort height and soft-close seat | People looking for an accessible-height option |
Our Picks: Best Toilets For Water Efficiency reviews
1. TOTTE Smart Toilet: Flexible Flush Settings and Bidet Features
The TOTTE combines a tankless toilet with a built-in bidet, heated seat, warm-air dryer, and automatic lid. Its two flush settings use 0.92 or 1.28 gallons per flush, giving you the option to use less water for suitable flushes while keeping a higher setting available.
The listed 360-degree siphon jet is designed to rinse the bowl, and the product title states a 1000g MaP flush rating. It offers several ways to flush, including a foot sensor, remote, automatic flush, and manual side knob. Backup power is also listed, which may be useful if the toilet loses electricity.
This is the most feature-heavy choice in the group, but its electronic functions make it more complex than a standard toilet. Before buying, check that the bathroom has a suitable electrical outlet and that the tankless design and 12-inch rough-in fit your space. It may be a better match for someone who wants bidet convenience than for someone seeking the simplest water-saving replacement.
Pros:
- Two flush settings, including a 0.92 GPF option
- Multiple flushing methods and backup power
- Built-in bidet, heated seat, and warm-air dryer
- Tankless design with a listed 12-inch rough-in
Cons:
- Electronic features make it more complex than a conventional toilet
- Check electrical access and installation requirements before ordering
Verdict: Choose the TOTTE if you want a low-flow option paired with smart controls and bidet features, rather than a basic toilet replacement.
2. DeerValley One-Piece Toilet: Dual Flush in a Skirted Design
This DeerValley model is a one-piece toilet with an elongated bowl, standard-height seating, and a skirted exterior. Its dual-flush system uses 1.1 GPF for one setting and 1.6 GPF for the other. That gives you a lower-volume option, although the 1.6 GPF setting uses more water than the 1.28 GPF models in this list.
The product description lists an 800g MaP rating and a 12-inch rough-in. Its smooth, glazed skirted shape is intended to make the exterior easier to wipe down than a toilet with more exposed contours. The overall dimensions are listed as 28.75 inches long, 14 inches wide, and 28 inches high, so measure your bathroom before choosing it.
The two flush volumes can be useful if you want separate settings, but the lower setting is not as low as the TOTTE’s 0.92 GPF option. This model may suit shoppers who prefer a clean-lined one-piece design and want a lower-volume flush choice without moving to a smart toilet.
Pros:
- Dual-flush settings include a 1.1 GPF option
- Elongated bowl and standard-height seating
- Skirted one-piece design with a glazed surface
- Product description lists an 800g MaP rating
Cons:
- The 1.6 GPF setting uses more water than the 1.28 GPF options here
- Confirm the listed dimensions and rough-in suit your bathroom
Verdict: Consider the DeerValley if you want a skirted one-piece toilet with a dual-flush choice and are comfortable with its higher-volume setting.
3. Gerber Avalanche Select: WaterSense-Certified 1.28 GPF Flush
The Gerber Avalanche Select is a conventional two-piece toilet with an elongated bowl and chair-height design. Its 1.28 GPF flush is listed as WaterSense certified, making certification a clear point of difference compared with the other toilets here, whose supplied product details do not state WaterSense certification.
Gerber lists QuietClean dual rim jets for a quieter flush and longer water flow across the bowl. A smooth KeepClean glaze is intended to help resist stains, and the package includes a soft-close seat, installation kit, wax ring, mounting hardware, and fill valve. Those included parts may help simplify a replacement, though you should still confirm the bowl height and rough-in against your existing setup.
This pick has a straightforward, familiar two-piece layout rather than dual-flush or smart controls. It is a practical option for shoppers who value a specified certification and want a chair-height bowl. The product information does not give an exact bowl height, so check the listing if precise measurements matter.
Pros:
- 1.28 GPF flush is listed as WaterSense certified
- Chair-height bowl and elongated shape
- Includes a soft-close seat and installation components
- Dual rim jets and stain-resistant glaze are listed features
Cons:
- Uses a single flush volume rather than offering dual-flush settings
- Exact bowl-height measurements are not provided in the supplied details
Verdict: The Gerber is a strong fit if you want a conventional chair-height toilet with a stated WaterSense certification and a 1.28 GPF flush.
4. Simple Project Extra-Tall Toilet: 21-Inch Bowl for Easier Transfers
This two-piece toilet pairs a 1.28 GPF flush with an unusually tall 21-inch bowl and an elongated shape. The added height is intended to reduce how far some users need to bend when sitting or standing. The product description notes that users under 5 feet 4 inches may prefer a footstool for support.
It has a 12-inch rough-in, soft-close seat, and ceramic construction. The split two-piece design may be easier to move than a one-piece toilet, but its height is a major factor to consider: it can be helpful for some adults and uncomfortable for others. Confirm exactly how the listed 21-inch measurement is defined and compare it with the height you need before ordering.
For water use, this model has the same 1.28 GPF figure as several standard-height alternatives in this guide. Its main reason to choose it is the extra-tall bowl, not a lower flush volume. It is not the most versatile pick for a shared bathroom where people have different height or mobility needs.
Pros:
- 1.28 GPF flush
- Extra-tall 21-inch bowl with an elongated shape
- 12-inch rough-in and soft-close seat
- Two-piece construction and mounting accessories are listed
Cons:
- The extra-tall seat may not suit shorter users
- Does not use less water per flush than the other 1.28 GPF choices
Verdict: Pick the Simple Project toilet when an extra-tall bowl is your priority and its height works for everyone who will use it.
5. Garvee Comfort-Height Toilet: 1.28 GPF with a Locking Seat
The Garvee is a two-piece elongated toilet with a 16-inch comfort-height seat and a 1.28 GPF side-push flush. The supplied product description identifies it as ADA compliant and cUPC certified. Because accessibility can depend on measurements and the full installation, confirm that the listed dimensions meet your specific needs before buying.
Its polypropylene seat has a locking design and soft-close hinge. The ceramic bowl has a smooth, stain-resistant glaze, and the toilet is listed for standard 12-inch rough-in plumbing. Compared with the extra-tall Simple Project option, this is a lower seat-height choice; compared with the Gerber, it offers a specific 16-inch seat measurement in the product details.
At 1.28 GPF, it does not offer a separate lower-volume flush. Its strengths are the stated seat height, included seat, and conventional two-piece format. If you need a lower water setting for some flushes, the TOTTE or DeerValley has multiple flush volumes.
Pros:
- 1.28 GPF flush and standard 12-inch rough-in
- Listed 16-inch comfort-height seat
- Soft-close seat with a locking design
- Product description lists cUPC certification
Cons:
- Single flush volume rather than a dual-flush system
- Verify accessibility measurements for your installation and needs
Verdict: The Garvee is worth considering if you want a 1.28 GPF toilet with a clearly stated 16-inch seat height and included soft-close seat.
How to Choose a Water-Efficient Toilet
Compare gallons per flush, not just the efficiency label
Gallons per flush (GPF) tells you how much water a toilet is designed to use for each flush. Several models in this guide use 1.28 GPF, while the TOTTE offers a 0.92 GPF setting and the DeerValley has 1.1 and 1.6 GPF settings. A lower setting can reduce water used per flush, but you should also consider whether the toilet’s flush performance and bowl rinse meet your needs.
Look for a certification when it matters to you
The Gerber Avalanche Select is specifically described as WaterSense certified. The other supplied product descriptions do not state that certification. If you want a certified model, check the product listing and certification details before purchase rather than assuming that a particular GPF number alone confirms certification.
Check flush performance details
A toilet must clear waste reliably to be practical. The product information lists a 1000g MaP rating for the TOTTE and an 800g MaP rating for the DeerValley. The other supplied descriptions do not provide MaP figures. Compare the stated performance information alongside water use, and avoid assuming that two toilets with the same GPF will perform identically.
Measure the rough-in and available space
The rough-in is the distance from the finished wall to the toilet’s floor drain bolts. Several toilets here list a 12-inch rough-in, but you should measure your own bathroom before ordering. Also compare the product’s length, width, and height with the space around the toilet, especially for an elongated bowl or tankless design.
Choose a bowl and seat height that fit the household
Standard, chair-height, comfort-height, and extra-tall seats can feel very different in daily use. The Simple Project model lists a 21-inch bowl, while the Garvee lists a 16-inch seat. Height can affect how easy it is to sit down and stand up, but an unusually tall toilet may not be comfortable for shorter users. If several people share the bathroom, consider each person’s needs.
Decide whether you want a dual-flush or single-flush model
A dual-flush toilet offers separate water volumes for different flush needs. That flexibility is available on the TOTTE and DeerValley, though their settings differ. The Gerber, Simple Project, and Garvee use a single listed flush volume. A dual-flush system is useful only if its lower setting suits your regular use and the control is convenient for your household.
Account for installation and added features
One-piece toilets, two-piece toilets, and tankless smart models have different installation considerations. The TOTTE includes electronic functions and should be checked for electrical access, while conventional models avoid those powered features. Review what is included with the toilet, such as a seat, wax ring, hardware, or installation kit, and confirm whether you need additional parts or professional installation.
Frequently Asked Questions
What does GPF mean on a toilet?
GPF means gallons per flush. It describes the volume of water used for a flush. A toilet with multiple flush settings may list more than one GPF figure, so check which setting applies to each flush option.
Is 1.28 GPF considered water efficient?
A 1.28 GPF toilet uses a set volume of water per flush, and the Gerber model in this guide is specifically listed as WaterSense certified at that rate. Certification is a separate detail to verify on the product rather than infer from the GPF figure alone.
Does a dual-flush toilet always save more water?
Not automatically. A dual-flush model gives you a choice of flush volumes, but the amount of water used depends on which setting is selected and how the toilet performs for your needs. Compare both listed settings with single-flush alternatives.
Which toilet in this list has the lowest flush setting?
The TOTTE lists a 0.92 GPF option, the lowest setting among these five products. It also offers a 1.28 GPF setting and includes electronic features such as a bidet and automatic lid.
What should I measure before replacing a toilet?
Measure the rough-in from the finished wall to the floor drain bolts, then check the toilet’s overall dimensions and seat height. Also make sure the bowl shape and clearance fit your bathroom and that the required installation connections are suitable.
Is a taller toilet better for everyone?
No. A taller seat may make sitting and standing easier for some people, but it can feel too high for others. Compare the listed height with your current toilet and consider the needs of everyone who will use it.
Final Recommendation
For a certification-led choice, the Gerber Avalanche Select stands out with its listed WaterSense certification, 1.28 GPF flush, and chair-height bowl. The TOTTE is the most feature-rich pick and has the lowest listed flush setting, while the DeerValley offers dual-flush control in a skirted one-piece design. If seat height is your main concern, compare the 16-inch Garvee with the much taller 21-inch Simple Project before deciding. The best fit depends on your plumbing, preferred height, and whether you value lower flush volume, certification, or added features most.
