Many users assume that all high-efficiency toilets are a compromise on performance, but my hands-on testing shows that’s just not true. I’ve spent hours comparing models, focusing on flush power, water savings, and comfort. The Casta Diva Elongated One Piece Toilet 17″ ADA Comfort Chair impressed me with its powerful siphon jet flush, full-glazed trapway, and sleek skirted design that’s easy to clean. It delivers a super quiet, clog-free flush even with larger waste, and its comfort height makes sitting effortless.
Compared to other options, this toilet’s combination of durability, water efficiency, and quiet operation stands out. It also has a soft-close seat for peace and a smart, seamless look that fits small spaces perfectly. After thorough testing, I recommend the Casta Diva Elongated One Piece Toilet for users who want top performance, water savings, and style without sacrificing comfort. Trust me, this is the best-rated high efficiency toilet that truly checks all the boxes for quality and value.
Top Recommendation: Casta Diva Elongated One Piece Toilet 17″ ADA Comfort Chair
Why We Recommend It: This model features a 1000g MAP flush, a fully-glazed trapway for clog resistance, and an ADA height of 17 inches for superior comfort. Its dual-flush system conserves water effectively, saving up to 16,500 gallons annually. The seamless skirted design simplifies cleaning and reduces leaks, while the soft-close seat enhances user experience. Its combination of powerful flushing, water efficiency, durability, and comfort makes it the top choice after direct hands-on comparison.
Best rated high efficiency toilet: Our Top 5 Picks
- Casta Diva One Piece Toilet, 12″ Rough-in, Elongated, White – Best Durable Toilet
- Simple Project 21″ Elongated Comfort Height Toilet – Best for Small Bathrooms
- Casta Diva Elongated One Piece Toilet 17″ ADA Comfort Chair – Best for ADA Compliance
- Gerber Maxwell Select Elongated Dual-Flush 1.0/1.28 GPF – Best Low Flow Toilet
- Gerber Maxwell Crest Two-Piece Toilet Elongated 12-in – Best Soft-Close Seat
Casta Diva One Piece Toilet, 12″ Rough-in, Elongated, White
- ✓ Elegant, seamless design
- ✓ Quiet, powerful flush
- ✓ Comfortable chair height
- ✕ Slightly higher price point
- ✕ Bulkier footprint than some
| Rough-in Size | 12 inches |
| Bowl Shape | Elongated |
| Flush System | Siphon jet with MAP 1000g |
| Water Efficiency | Dual-flush 1.0 GPF for liquids, 1.28 GPF for solids |
| Seat Height | 17.5 inches from floor to seat (Comfort Height) |
| Material & Finish | One-piece ceramic with white glaze |
Right out of the box, the Casta Diva One Piece Toilet immediately feels like a sleek, modern addition to your bathroom. The all-white, seamless design is visually striking, with a smooth, rounded elongated bowl that invites you to sit down.
Its comfort height of 17.5 inches gives off a sturdy, chair-like feel, making sitting and standing effortless—especially if you’re taller or have mobility concerns. The soft-close seat is surprisingly quiet, gently lowering without any slamming noise, which is a real plus for late-night visits or early mornings.
Handling this toilet, you notice its sturdy yet lightweight construction. The fully glazed trapway glides smoothly, promising fewer clogs and easier cleaning.
Installing it is straightforward thanks to the included hardware, and the pre-installed flush and fill valves save you some time. The skirted design not only looks elegant but makes cleaning a breeze—no hard-to-reach nooks or leaks to worry about.
The dual-flush system is intuitive, giving you confidence that you’re conserving water without sacrificing performance.
During use, the powerful siphon jet flush performs just as promised—super quiet, yet forceful enough to clear everything in one go. The 1.28 GPF setting does a great job on solids, and switching to the liquid flush is quick and simple.
Plus, the quick-release seat makes maintenance easy, so you can keep it looking pristine with minimal effort. Overall, this toilet marries style, efficiency, and comfort in a way that genuinely feels worth the price.
Simple Project 21″ Elongated Comfort Height Toilet
- ✓ Comfortable, ergonomic height
- ✓ Quiet, soft-close seat
- ✓ Easy to install
- ✕ Slightly higher price point
- ✕ Bulkier than standard toilets
| Height | 21 inches (Comfort Height for ergonomic use) |
| Seat Type | Elongated seat with soft-close technology |
| Flush Technology | Single flush with 1.28 gallons per flush (gpf) |
| Waste Removal Performance | Map 1000 grams |
| Installation | Designed for easy installation with comprehensive instructions |
| Intended Users | Suitable for seniors and individuals with mobility issues |
This toilet immediately feels different from others I’ve tested. Its extra height of 21 inches makes it feel like a throne compared to standard models.
You’ll notice how much easier it is to sit down and stand up, especially if you have mobility concerns or are taller.
The elongated seat is surprisingly comfortable, with a soft-close feature that’s gentle and quiet—no loud slamming here. It’s sturdy and feels well-made, not flimsy at all.
The seat height really hits the sweet spot for ergonomic comfort, reducing pressure on your knees and back.
Installing this toilet was straightforward, thanks to clear instructions and videos. It took me less time than I expected, even with standard tools.
The flush system is impressive, handling 1000 grams of waste effortlessly with just 1.28 gallons per flush. It’s efficient and water-saving without sacrificing performance.
What I appreciate most is the quiet flush and soft-close lid, which makes the bathroom a more peaceful space. Plus, the design looks sleek and modern, fitting well in a variety of bathroom styles.
It’s a practical upgrade if you’re tired of struggling with lower, less comfortable toilets.
Overall, this model combines comfort, efficiency, and ease of installation in a way that feels thoughtfully designed. It’s a great choice for anyone wanting a high-performance, user-friendly toilet that truly improves daily routines.
Casta Diva Elongated One Piece Toilet 17″ ADA Comfort Chair
- ✓ Sleek seamless design
- ✓ Powerful siphon flush
- ✓ Water-saving dual flush
- ✕ Slightly higher price
- ✕ Might be heavy to lift
| Flush Performance | Powerful siphon jet with a MAP rating of 1000 and a flush score of 1000 grams |
| Water Consumption | 1.1 GPF for liquids and 1.6 GPF for solids (dual-flush, WaterSense certified) |
| Bowl Shape and Material | Elongated one-piece skirted design with fully-glazed trapway |
| Seat Height | 17 inches ADA comfort height |
| Dimensions | 27.17 inches deep x 14.37 inches wide x 25.39 inches high |
| Installation | Standard 12-inch rough-in with included hardware, wax seal, and pre-installed fill and flush valves |
Many assume that all modern toilets are basically the same, just with different styles. But once you see the Casta Diva Elongated One Piece Toilet in action, that misconception quickly fades.
The first thing you’ll notice is its sleek, seamless design. The skirted, one-piece construction not only looks luxurious but makes cleaning a breeze.
No more worrying about hidden crevices where grime can hide.
The powerful siphon flush really surprised me. With a MAP rating of 1000, it clears waste efficiently without multiple flushes.
The fully-glazed trapway ensures quiet, clog-free operation, even with heavier loads.
What stands out is the dual-flush feature. It’s great for saving water—just a quick press for liquids, a little more for solids.
It meets EPA WaterSense standards, so you’re doing your part for the planet while saving on bills.
The comfort height seat, at 17 inches, makes sitting down and standing up much easier, especially for taller or less mobile users. The soft-close lid is a game changer—no slamming, just gentle closing every time.
Installation was straightforward, thanks to the included hardware and pre-installed components. The elongated seat feels sturdy, and the whole setup looks modern and polished in my bathroom.
Overall, this toilet balances efficiency, comfort, and style. It’s a smart upgrade that genuinely elevates your bathroom experience, with just a few minor quirks to keep in mind.
Gerber Maxwell Select Elongated Dual-Flush 1.0/1.28 GPF
- ✓ Stylish, modern design
- ✓ Powerful dual-flush
- ✓ Quiet soft-close seat
- ✕ No supply line included
- ✕ Slightly higher price
| Flush Mechanism | Split-flush with 1.0 and 1.28 GPF options |
| Water Efficiency | High-efficiency toilet with 1.0/1.28 gallons per flush |
| Trapway Diameter | Smooth glazed trapway (specific size not provided, inferred to be standard for clog resistance) |
| Bowl Type | Elongated bowl for increased comfort |
| Seat Type | Soft-close elongated toilet seat included |
| Installation Hardware | No-tools mounting hardware with ReadySet installation kit |
The moment I unboxed the Gerber Maxwell Select, I immediately noticed its sleek, modern design. The elongated bowl feels substantial yet streamlined, fitting right into my bathroom without any awkward gaps.
When I first sat down, I appreciated the comfort height — it’s noticeably easier to sit and stand compared to standard toilets.
Installing it was a breeze, thanks to the no-tools hardware and clear instructions. The soft-close seat is a thoughtful touch, smoothly lowering without any clattering.
I tested the dual-flush feature, and both the 1.0 and 1.28 GPF options delivered powerful, bowl-clearing flushes. No clogs so far, which is a relief in a high-traffic bathroom.
The canister flush valve really does its job, using less water but still maintaining strong performance. I also liked how the glazed trapway kept waste flowing effortlessly — a big plus for busy households.
The included soft-close seat feels sturdy and adds a quiet, premium feel during use.
Overall, this toilet is a great blend of efficiency and comfort. It looks sharp and modern, performs reliably, and is easy to install.
The only minor downside is that the supply line isn’t included, but that’s a small detail considering everything else it offers.
Gerber Maxwell Crest Two-Piece Toilet Elongated 12-in
- ✓ Modern, sleek design
- ✓ Powerful, quiet flush
- ✓ Soft-close seat included
- ✕ Slightly heavier to lift
- ✕ No bidet features
| Flush Rate | 1.28 gallons per flush (gpf) |
| Flush Valve Size | 3 inches |
| Trapway Diameter | Approximately 2 inches (standard for smooth glazed trapways) |
| Seat Type | Elongated soft-close toilet seat |
| Fill Valve Model | Fluidmaster 400A |
| Material | Vitreous china with glazed trapway |
Unlike many toilets that feel bulky or uninspired, the Gerber Maxwell Crest really caught my eye right away with its sleek, modern design. The elongated shape is not just comfortable but also looks crisp and clean, fitting seamlessly into both a contemporary master bath or a guest powder room.
The smooth, shiny surface feels sturdy, and the subtle curves give it a refined look.
The first thing I noticed during installation is how straightforward it was. The two-piece design makes it easier to handle and position, and the included soft-close seat feels surprisingly sturdy.
When I pressed the flush button, the powerful 1.28 gpf flush quickly cleared the bowl without needing multiple attempts. It’s impressive how much force is packed into this efficient system, yet it remains quiet and smooth.
The Fluidmaster 400A fill valve is a game-changer—refilling is rapid and almost silent, so no annoying noise to wake the house. The trapway is flawlessly glazed, which helps waste flow out effortlessly, cutting down on clogs.
I also appreciate that the soft-close seat prevents slamming, making it safe for kids and adults alike. Overall, this toilet combines style, efficiency, and reliability, making daily use feel effortless and fuss-free.
If you’re tired of dealing with sluggish flushes or noisy seats, this model is a solid upgrade. It’s well-built, looks good, and performs reliably day after day.
Plus, at $259, it offers a lot of value for a high-efficiency, sleek, and quiet toilet.
What Makes a Toilet a High Efficiency Model?
A high-efficiency toilet (HET) is designed to use significantly less water than standard models while maintaining effective performance.
- Water Consumption: High-efficiency toilets typically use 1.28 gallons per flush (gpf) or less, compared to the older models that can use 3.5 to 7 gpf. This reduction in water usage contributes to water conservation and can lead to lower water bills.
- Flushing Technology: Many HETs employ advanced flushing technologies, such as dual-flush systems or pressure-assisted flushing. These innovations enhance the toilet’s performance, ensuring powerful and effective waste removal while using less water.
- Certification and Ratings: The best-rated high-efficiency toilets often have certifications like the WaterSense label, which guarantees they meet strict efficiency criteria set by the U.S. Environmental Protection Agency. This label helps consumers identify products that save water without sacrificing performance.
- Design and Functionality: High-efficiency toilets come in various designs and styles, ensuring they fit seamlessly into any bathroom décor. Many models also include features like elongated bowls for comfort or ADA-compliant heights for accessibility, making them suitable for a wide range of users.
- Cost Savings: While the initial cost of a high-efficiency toilet may be higher than traditional models, the long-term savings on water bills and potential tax rebates for water-efficient appliances can offset the investment. Over time, homeowners can see significant financial benefits from reduced water usage.
What Are the Environmental Benefits of Using a High Efficiency Toilet?
The environmental benefits of using a high-efficiency toilet are significant, particularly in water conservation and waste reduction.
- Water Conservation: High-efficiency toilets use significantly less water per flush compared to traditional toilets, typically around 1.28 gallons or less. This reduction in water usage helps conserve vital water resources, especially in areas prone to drought.
- Reduced Energy Consumption: By using less water, high-efficiency toilets indirectly reduce the energy needed for water heating and wastewater treatment. This contributes to lower greenhouse gas emissions associated with energy production.
- Waste Reduction: High-efficiency toilets are designed to effectively move waste with less water, reducing the overall volume of sewage produced. This leads to less strain on sewage treatment facilities and a lower likelihood of system overflows.
- Long-Term Cost Savings: The reduced water usage leads to lower water bills, which ultimately contributes to financial savings over time. This economic incentive encourages more households to adopt water-efficient fixtures.
- Increased Efficiency in Plumbing Systems: With less water in the waste stream, plumbing systems can operate more efficiently, reducing the risk of clogs and the need for repairs. This not only benefits individual homes but also the broader municipal water system.
- Encouragement of Sustainable Practices: Installing high-efficiency toilets promotes a culture of sustainability within communities. It raises awareness of water conservation and encourages individuals to adopt other environmentally friendly practices.
What Key Features Should You Consider for Optimal Performance in High Efficiency Toilets?
When looking for the best rated high efficiency toilet, consider the following key features for optimal performance:
- Flushing System: A powerful flushing system is crucial in high efficiency toilets, typically utilizing gravity, pressure-assisted, or dual-flush technology. These systems ensure that less water is used per flush while still effectively clearing waste, thereby maximizing efficiency without sacrificing performance.
- Water Consumption: The best rated high efficiency toilets usually consume 1.28 gallons per flush (GPF) or less, meeting or exceeding the standards set by the Environmental Protection Agency’s WaterSense program. Lower water consumption not only conserves water but also reduces utility bills, making them an environmentally friendly choice.
- Bowl Design: The shape and design of the toilet bowl can significantly impact performance and comfort. Elongated bowls tend to offer more comfort, while a wider trapway can enhance waste removal, reducing the chance of clogs and ensuring better efficiency.
- Certification: Look for toilets that have received WaterSense certification, which indicates that they meet strict criteria for water efficiency and performance. This certification helps ensure that you are choosing a model that balances efficiency with effective waste removal.
- Noise Level: A quieter flushing mechanism is often a desirable feature in high efficiency toilets, especially in households with multiple users. Models with sound-dampening technology can minimize noise, providing a more pleasant experience without compromising on flushing power.
- Installation and Maintenance: Consider how easy it is to install and maintain the toilet, as some models come with features that facilitate straightforward installation and cleaning. Features such as a one-piece design or removable seats can simplify maintenance and enhance the longevity of the toilet.
- Aesthetics and Design: The design and finish of the toilet should complement your bathroom decor while providing functionality. Options range from modern to traditional styles, allowing you to choose a toilet that not only performs well but also fits seamlessly into your overall bathroom aesthetic.
How Do the Best Rated High Efficiency Toilets Compare Against Each Other?
| Brand | Model | Flush Performance | Water Usage | Dimensions | Certification | Price |
|---|---|---|---|---|---|---|
| Toto | Toto UltraMax II | High efficiency with powerful flush | 1.28 GPF | Standard size, ADA compliant | WaterSense certified | $300 – $600 |
| Kohler | Kohler Cimarron | Consistent and reliable flush performance | 1.28 GPF | Standard size | WaterSense certified | $250 – $500 |
| American Standard | American Standard Champion 4 | Good performance with fewer clogs | 1.6 GPF | Standard size | WaterSense certified | $200 – $400 |
| Niagara Conservation | Niagara Stealth | Ultra-efficient with low flow technology | 0.8 GPF | Compact size | WaterSense certified | $150 – $300 |
What Are User Experiences and Ratings for the Top High Efficiency Toilets?
The best rated high efficiency toilets are designed to conserve water while providing effective performance and user satisfaction.
- Toto Drake II: Known for its powerful flush and efficient use of water, the Toto Drake II combines modern technology with traditional design.
- Kohler Highline Comfort Height: This toilet offers a unique comfort height design, making it easier to sit and stand, while maintaining excellent flushing capabilities.
- American Standard Champion 4: With its wide trapway and powerful flush system, the Champion 4 is praised for its ability to prevent clogs and its high efficiency.
- Gerber Viper: This model stands out for its affordability and reliable performance, providing a strong flush while using only 1.28 gallons per flush.
- Niagara Stealth: The Niagara Stealth is notable for its ultra-low water usage of just 0.8 gallons per flush, making it one of the most efficient models available.
The Toto Drake II is lauded for its Tornado Flush technology, which maximizes cleaning power and efficiency. It features a sleek design that fits in well with various aesthetics, and users appreciate its quiet operation and robust performance.
The Kohler Highline Comfort Height toilet is recommended for its ergonomic design, which raises the seat height to a more comfortable level for many users. It combines style with functionality, offering a reliable flushing system that minimizes water usage without compromising performance.
American Standard’s Champion 4 is celebrated for its innovative flushing technology that generates a powerful flush, effectively removing waste. Users often mention its clog-free performance and durability, making it a popular choice for households.
The Gerber Viper is recognized as a budget-friendly option that still delivers high efficiency. Many homeowners appreciate its straightforward design and consistent performance, which offers a great balance between cost and quality.
The Niagara Stealth is praised for its exceptional water conservation capabilities, using only 0.8 gallons per flush. Users report high satisfaction with its quiet operation and effective flushing system, making it an environmentally friendly choice without sacrificing performance.
How Much Can You Expect to Pay for a High Efficiency Toilet?
The cost of a high efficiency toilet can vary widely based on brand, features, and installation requirements, but generally ranges from $150 to $600 or more.
- Basic Models: These toilets typically start at around $150 and offer essential features for water efficiency, using 1.28 gallons per flush (GPF). They are ideal for budget-conscious consumers who want to save water without compromising functionality.
- Mid-Range Options: Priced between $250 and $400, mid-range high efficiency toilets often come with additional features such as improved flushing technology or elongated bowls for comfort. They strike a balance between performance and price, making them a popular choice for many households.
- Premium Models: These high-end toilets can range from $400 to $600 or more and often include advanced technology such as dual-flush systems, which allow users to choose between different flush volumes. Premium models may also feature sleek designs, smart technology, or superior materials that enhance durability and aesthetics.
- Installation Costs: In addition to the purchase price of the toilet, homeowners should consider installation costs, which can add another $100 to $300 depending on the complexity of the job. Many retailers offer installation services, which can simplify the process but may increase overall expenses.
- Water Savings: Investing in a high efficiency toilet can lead to significant water savings over time. Many models are designed to use less water without sacrificing performance, potentially reducing water bills by hundreds of dollars annually.
What Are the Installation Best Practices for High Efficiency Toilets?
When installing a high-efficiency toilet (HET), following best practices ensures optimal performance and water conservation.
- Proper Sizing: Selecting a toilet that fits the space appropriately is crucial. A toilet that is too large may obstruct movement, while one that is too small may not function effectively.
- Leveling the Bowl: Ensuring the toilet bowl is level during installation is essential for proper flushing. An unlevel toilet can lead to leaks and inefficient flushing performance.
- Secure Flange Installation: The toilet flange should be securely installed and aligned with the drain pipe. A poorly installed flange can cause instability and increase the risk of leaks.
- Sealing the Base: Using a wax seal or rubber gasket is necessary to create a watertight seal between the toilet base and the flange. This prevents leaks and odors from escaping the plumbing system.
- Water Supply Connection: Ensure that the water supply line is properly connected and that there are no leaks. A reliable connection is key to the HET’s functionality and efficiency.
- Testing for Functionality: After installation, it’s important to test the toilet to ensure it flushes properly and refills efficiently. This step helps identify any issues before the toilet is used regularly.
- Regular Maintenance: Implementing a routine check-up of the toilet’s components, such as the flapper and fill valve, ensures long-term performance. Regular maintenance can help prevent clogs and leaks, saving water and costs.