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American Standard Studio S Review: Sleek One-Piece
A close look at the Studio S one-piece toilet's flushing performance, water efficiency, design credentials, and how it stacks up against TOTO, Kohler, and Woodbridge rivals in the same price tier.
Why Trust Best Flushing Toilets
- Flushing power and MaP flush-test scores
- Water efficiency (GPF and EPA WaterSense)
- Aggregated owner reviews
- Clog resistance and trapway design
- Brand reliability and warranty
Research updated June 2026.
Quick Answer
The American Standard Studio S is a well-designed siphonic one-piece toilet with a 1.28 GPF EverClean-glazed bowl, EPA WaterSense certification, and a sleek concealed trapway that rivals pricier European styles. Flushing scores are solid for the price tier, though power-flush enthusiasts may prefer the TOTO UltraMax II or American Standard Champion 4.
What Is the American Standard Studio S?
The Studio S is American Standard's design-forward one-piece toilet line, sitting above the utilitarian Cadet 3 and below the performance-oriented VorMax in the brand's lineup. It features a fully skirted, integrated tank-to-bowl profile that hides the trapway completely, giving it a cleaner visual line that bathroom designers often request for contemporary and transitional settings.
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American Standard introduced the Studio S as a style-plus-performance compromise: EPA WaterSense-certified at 1.28 gallons per flush (GPF), elongated bowl, comfort-height seat (17 to 19 inches), soft-close seat included in most SKUs, and the brand's proprietary EverClean antimicrobial glaze baked onto the vitreous china surface. The EverClean glaze inhibits the growth of bacteria, mold, and mildew on the bowl surface, a feature American Standard has offered across most of its mid-to-premium lines for over a decade.
The Studio S ships in classic white (White #001) and bone (#021) finishes. It is available in both 12-inch and 10-inch rough-in configurations, which is a meaningful advantage over many one-piece competitors that only offer the standard 12-inch rough-in. The 10-inch rough-in model (model 2988.101) allows the toilet to fit older homes where the standard 12 inches falls short.
Expert Take
The Studio S occupies a genuinely useful niche: a skirted one-piece that looks premium without demanding the $800-plus price of a TOTO Carlyle II or Kohler San Raphael. The EverClean glaze is a real-world cleaning advantage, not just marketing language, and the 1.28 GPF rating keeps the toilet compliant with California, Colorado, and other water-restricted states. For buyers who prioritize aesthetics and want to avoid the visual clutter of an exposed two-piece trapway, this is one of the most accessible entry points in that category.
What Are the Published MaP Flush Scores for the American Standard Studio S?
Based on MaP (Maximum Performance) testing data, the American Standard Studio S models achieve scores in the 500 to 800 gram range depending on the specific SKU and configuration tested. MaP testing, conducted by an independent third party at map-testing.com, measures how many grams of soybean paste (a proxy for solid waste) a toilet can flush completely in a single flush. A score of 500g is considered adequate for residential use; 800g and above is considered high-performance. The Studio S sits in the competent mid-range, outperforming basic 1.6 GPF legacy toilets in water efficiency while delivering reliable everyday flushing.
For reference, the American Standard Champion 4 consistently earns 1,000g MaP scores (the maximum tested), which is why it remains the go-to recommendation for households with frequent clogging issues. If raw flushing muscle is the priority, the Champion 4 is the stronger choice within American Standard's own lineup.
Expert Take
MaP scores above 500g satisfy the majority of residential use cases. The Studio S's mid-range MaP performance is appropriate for typical households. If a household has a history of drain clogs or uses thicker toilet paper consistently, spending the extra $50 to $80 to step up to a 1,000g-rated model like the Champion 4 or the VorMax makes mathematical sense, since the cost of a single plumber visit typically exceeds that difference.
Is the American Standard Studio S EPA WaterSense Certified?
Yes. The American Standard Studio S carries EPA WaterSense certification, meaning it has been independently tested and verified to use no more than 1.28 gallons per flush while meeting a minimum flush performance threshold. WaterSense toilets use at least 20 percent less water than the federal standard of 1.6 GPF. Over a year of typical use (roughly 5 flushes per person per day), a WaterSense toilet can save more than 13,000 gallons annually compared to a pre-1994 3.5 GPF toilet, and about 4,000 gallons compared to a standard 1.6 GPF model.
The Studio S's WaterSense status also makes it eligible for utility rebate programs in many states and municipalities, including programs in California, Colorado, Texas, Washington, and New York. Buyers should check their local water utility's rebate portal before purchasing.
How Does the Studio S Compare to the TOTO UltraMax II, Kohler Santa Rosa, and Woodbridge T-0001?
All four are skirted or concealed-trapway one-piece elongated toilets in the mid-to-upper residential price bracket, all WaterSense-certified at 1.28 GPF (or 1.0/1.28 dual-flush for some variants). The TOTO UltraMax II holds the strongest MaP scores in this group, consistently hitting 1,000g, and TOTO's CEFIONTECT glaze is widely considered the most durable hydrophilic surface treatment in the consumer market. The Kohler Santa Rosa (using Kohler's Class Five flush engine) earns similarly high MaP ratings. The Woodbridge T-0001 is a budget-friendly skirted one-piece that often undercuts all three on price but receives more mixed owner feedback on seat quality and long-term seal reliability.
The American Standard Studio S sits comfortably between the Woodbridge and the TOTO/Kohler flagships in both price and performance, making it a defensible choice for buyers who want the skirted aesthetic without paying the TOTO premium.
| Model | Type | GPF | MaP Score | WaterSense | Rough-In | Glaze | Check Price |
|---|---|---|---|---|---|---|---|
| American Standard Studio S | One-piece skirted | 1.28 | 500-800g | Yes | 10" / 12" | EverClean | Check price |
| TOTO UltraMax II | One-piece skirted | 1.28 | 1,000g | Yes | 12" | CEFIONTECT | Check price |
| Kohler Santa Rosa | One-piece compact | 1.28 | 800-1,000g | Yes | 12" | Gleam | Check price |
| Woodbridge T-0001 | One-piece skirted | 1.28 | 500-600g | Yes | 12" | Standard | Check price |
| American Standard Champion 4 | Two-piece | 1.6 | 1,000g | No | 12" | EverClean | Check price |
| Swiss Madison St. Tropez | One-piece skirted | 1.28 | 500-700g | Yes | 12" | Standard | Check price |
MaP scores represent published ranges from map-testing.com. "Winner" row denotes top overall flushing performance in this comparison group.
What Are the Key Design Features of the Studio S One-Piece?
The Studio S uses a fully integrated skirted profile that conceals the trapway, removing the ridges and crevices that collect grime on traditional two-piece toilets. The bowl features a large water surface area, which reduces splash and skid marks. The toilet is comfort-height (17 to 19 inches from floor to seat), which meets ADA accessibility guidelines and is generally preferred by adults 5 feet 4 inches and taller. Most SKUs include a SeatSolutions slow-close elongated seat with quick-release hinges for cleaning access.
The tank uses American Standard's dual siphon flush valve, which creates a consistent swirling action at 1.28 GPF without pressure assistance. The fully skirted trapway (minimum 2-inch opening) meets the standard residential requirement, though it does not match the 2.125-inch full-glazed trapway of the Champion 4 series.
What Do Owners Say About the American Standard Studio S?
Aggregated owner reviews across retail platforms highlight consistent satisfaction with the Studio S's aesthetics and ease of cleaning, with the concealed trapway and EverClean glaze frequently cited as standout features. The most common complaints in owner reviews concern seat hinge durability over multi-year use, and occasional reports of the fill valve running longer than expected before shutting off -- a common issue across all toilet brands that typically resolves with fill valve adjustment or replacement. Overall satisfaction ratings in aggregated reviews generally fall in the 4.0 to 4.3 out of 5.0 range.
Positive feedback is strong on flush consistency. Owners in states with lower water pressure report the Studio S performing reliably across multiple flushes without the double-flush problem that afflicts many low-flow toilets designed before 2010. The 10-inch rough-in model receives notably positive reviews from owners retrofitting older bathrooms.
Expert Take
Owner reviews are a useful signal but carry a selection bias: buyers who encountered installation problems or persistent issues are more likely to post than satisfied buyers who simply use the toilet every day without incident. The Studio S's 4.0 to 4.3 aggregated rating is strong for a product category where installation variables (rough-in, wax ring seal, supply line pressure) significantly affect the experience regardless of toilet quality. Reading one-star reviews closely on the Studio S reveals that most negative experiences trace back to installation issues or mismatched rough-in measurements rather than manufacturing defects.
Studio S Specifications at a Glance
| Specification | Value |
|---|---|
| Flush Volume | 1.28 GPF (HET) |
| WaterSense Certified | Yes |
| Bowl Shape | Elongated |
| Toilet Height (rim) | Comfort height (17-19") |
| ADA Compliant | Yes |
| Trapway Type | Fully concealed skirted |
| Minimum Trapway Opening | 2 inches |
| Rough-In Options | 10-inch and 12-inch |
| Glaze | EverClean antimicrobial |
| Seat Included | SeatSolutions slow-close (most SKUs) |
| Material | Vitreous china |
| Finish Options | White, Bone |
| Warranty | 5-year limited |
| Weight (approximate) | 100-115 lbs |
EverClean Glaze: What It Is and What It Does
EverClean is American Standard's proprietary antimicrobial glaze technology, applied at the factory as part of the vitreous china firing process rather than as a topcoat. The glaze uses a silver-based compound bonded into the ceramic surface that inhibits the growth of bacteria, mold, and mildew on the exposed bowl surface. American Standard publishes testing data showing the glaze reduces surface microbial activity by up to 99.9 percent compared to untreated ceramic surfaces.
In practical terms, EverClean means the Studio S bowl stays cleaner between scrubbing sessions and resists the pink or black ring buildup that develops in high-humidity bathrooms. Owners in humid climates report noticeably longer intervals between required deep-cleaning. It does not replace regular cleaning but meaningfully extends how long a clean bowl stays clean.
TOTO's comparable technology is CEFIONTECT, a hydrophilic (ion-charged, water-attracting) glaze that causes water and waste to sheet off the bowl surface rather than cling. CEFIONTECT and EverClean approach surface hygiene from different angles -- TOTO's via hydrophilics, American Standard's via antimicrobial chemistry -- and both are considered effective in real-world use. CEFIONTECT has a longer published track record and appears on every TOTO toilet in the relevant price band. EverClean is exclusive to American Standard but not available on all American Standard models; its presence on the Studio S is one of the model's genuine differentiators at this price point.
Comparing Flush Mechanisms: Siphonic vs. Washdown
The Studio S uses a siphonic flush mechanism, which is the dominant design in North American residential toilets. Siphonic toilets use the force of water flowing into a curved trapway to create a siphon effect that evacuates bowl contents. The result is a powerful, water-level-maintaining flush with a large water surface in the bowl that resists skid marks and splash. Siphonic bowls typically carry a 12-inch water surface or larger.
European toilets, including some Duravit and Villeroy and Boch models, use washdown mechanisms, which push waste over a shelf and out a smaller exit. Washdown toilets tend to be noisier and leave a smaller water surface but handle large solid waste more directly. For the North American market and standard plumbing stack configurations, siphonic is the appropriate choice and is what virtually all TOTO, Kohler, American Standard, Gerber, and Woodbridge toilets sold in the United States use.
Expert Take
The Studio S's siphonic flush at 1.28 GPF is well-engineered for what it is. The dual siphon valve creates a consistent evacuation pattern, and the concealed trapway profile does not create flush turbulence issues that some poorly designed skirted toilets suffer from. American Standard's engineering on this model reflects real-world testing experience with the skirted profile, which was a much harder design challenge in the early years of one-piece skirted toilets when flush consistency was difficult to maintain without a visible trapway channel.
Installation Considerations for the Studio S
At approximately 100 to 115 pounds, the Studio S is a heavy installation, and most plumbers and installation guides recommend two people for setting a one-piece toilet of this weight. The integrated tank-and-bowl cannot be separated for transport or installation, unlike a two-piece toilet where the tank and bowl are shipped and installed separately.
The rough-in distance must be confirmed before purchasing. Measure from the finished wall behind the toilet to the center of the closet flange bolts. Most homes built after 1960 use a 12-inch rough-in; older homes may require the 10-inch variant. The Studio S's availability in both configurations gives it an edge over competitors like the TOTO UltraMax II, which only ships in 12-inch rough-in as a standard offering (TOTO's Unifit adapter adds cost for other rough-in sizes).
Wax ring selection matters for a skirted toilet. Because the skirted profile places the toilet base flush with the floor with no visible trapway projection, a standard wax ring works correctly when the flange is at or slightly above floor level. If the flange sits below the finished floor, an extended wax ring or an adjustable wax-free seal (such as the Fernco WaxFree or Korky wax-free model) is the correct solution. For a detailed guide on installation, see how to install a toilet.
Seat Quality and the SeatSolutions System
Most Studio S SKUs include a SeatSolutions slow-close elongated seat. SeatSolutions seats use a hydraulic hinge mechanism that prevents the seat from slamming when dropped. The quick-release hinge allows the entire seat to unclip from the bowl in seconds for thorough cleaning underneath the hinge brackets, where bacteria accumulate in any toilet with permanently attached seats.
Owner reviews are generally positive on the slow-close mechanism in early use but note that the hinge mechanism can loosen over two to four years of daily use, a common complaint across all toilet-seat-included bundles in this price range regardless of brand. American Standard, TOTO, Kohler, and Woodbridge all field similar complaints about included seats. For long-term quality, replacing the included seat with a premium aftermarket seat (such as a Bemis 200SLOWT or Kohler K-4636 slow-close seat) at the three-to-four year mark is a common owner recommendation.
Water and Cost Savings Over Time
Upgrading from a pre-1994 toilet using 3.5 GPF to the Studio S at 1.28 GPF saves approximately 2.22 gallons per flush. At the national average of 5 flushes per person per day for a household of 4 people, that is 44.4 gallons per day, or roughly 16,200 gallons per year. At the U.S. average residential water rate of $0.004 per gallon (combined water and sewer), the annual savings approach $65 per year -- not dramatic, but the toilet typically pays for itself in water savings within three to five years when replacing a high-flow model.
For households in the western United States where water rates are considerably higher, particularly in Southern California, Nevada, and Arizona, the savings are more substantial. Several utilities in those regions offer rebates of $50 to $200 per WaterSense toilet installed, which can meaningfully offset the purchase cost. See toilet rebate programs by state for current rebate availability.
Compared to a standard 1.6 GPF toilet, the Studio S saves 0.32 gallons per flush. At the same household usage rate, that is approximately 2,330 gallons per year -- more modest savings that represent a secondary consideration rather than a primary purchase driver when upgrading from a 1.6 GPF model.
For context on how the Studio S fits into the broader best flushing toilets landscape, it ranks as a solid mid-range performer: more style-conscious than the Champion 4, more affordable than the TOTO Carlyle II, and more feature-complete than the basic Woodbridge T-0001.
American Standard Studio S vs. American Standard VorMax
Within American Standard's own lineup, the VorMax represents the step up in flushing technology. The VorMax flush engine uses a single-jet design that creates a spiraling flush action across the entire bowl surface, designed to virtually eliminate skid marks without EverClean's surface chemistry alone. The VorMax Plus adds EverClean glaze on top of the VorMax flush engine, making it the most capable American Standard bowl for maintaining visual cleanliness between cleanings.
The Studio S uses a conventional dual-siphon flush rather than the VorMax engine, which is the core performance difference. For a bathroom where design aesthetics are the dominant consideration, the Studio S is appropriate. For a bathroom that sees heavy use, is shared by multiple people, or has a history of bowl staining and frequent cleaning demands, the extra investment in a VorMax or VorMax Plus is supported by the engineering difference.
Warranty Coverage
American Standard backs the Studio S with a 5-year limited warranty covering manufacturing defects in materials and workmanship. This is a shorter warranty than TOTO's standard 1-year toilet warranty with extended parts coverage or Kohler's limited lifetime warranty on vitreous china. For long-term ownership, the warranty difference between brands is less significant than build quality, since vitreous china does not fail under normal residential use, and flush mechanisms can be rebuilt with widely available parts at minimal cost.
American Standard's customer parts support and service network is strong across North America. Replacement flush valves, fill valves, and seats for Studio S models are available through major plumbing supply houses and big-box retailers, which is a practical advantage over some European-style toilets where proprietary parts require direct-from-manufacturer sourcing.
Who Should Buy the American Standard Studio S?
The Studio S is the right choice for buyers who want a clean, contemporary one-piece aesthetic in a mid-range budget, value the EverClean antimicrobial glaze for reduced cleaning frequency, need a 10-inch rough-in option in a skirted one-piece (a genuinely rare configuration), want EPA WaterSense compliance for rebate eligibility or water-restricted regions, and do not have a history of frequent clogging that would demand a 1,000g MaP-rated model.
It is not the best choice for buyers who prioritize maximum flushing power above all else (the American Standard Champion 4 or TOTO UltraMax II are stronger), buyers with very tight budgets (the Woodbridge T-0001 offers similar aesthetics at lower cost), or buyers who want a lifetime warranty on all components (Kohler's warranty terms are more expansive).
For related comparisons that help place the Studio S in context, see one-piece vs. two-piece toilet and the best flushing one-piece toilets roundup.
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Frequently Asked Questions
Does the American Standard Studio S come with a toilet seat?
Most Studio S SKUs include a SeatSolutions slow-close elongated seat with quick-release hinges. Verify the specific model number before purchasing, as some contractor-grade or stripped versions may list the seat separately. The included seat is elongated to match the bowl shape and fits the Studio S's specific hinge mounting pattern.
What is the rough-in size for the American Standard Studio S?
The Studio S is available in both 12-inch and 10-inch rough-in configurations. Measure from the finished wall to the center of the closet flange bolts before selecting a model. Most homes built after 1960 use 12-inch rough-in; many pre-1960 homes use 10-inch. Purchasing the wrong rough-in size requires a return and reorder, so this measurement is critical.
Is the American Standard Studio S ADA compliant?
Yes. The Studio S is designed as a comfort-height toilet with a rim height between 17 and 19 inches, which meets ADA accessibility requirements for toilet height. Note that full ADA compliance for a bathroom also requires specific clearance space around the toilet, grab bar placement, and door width, none of which the toilet alone can provide.
What is EverClean glaze and how long does it last?
EverClean is American Standard's silver-based antimicrobial glaze fired into the vitreous china during manufacturing. Because it is part of the ceramic body rather than a surface coating, it does not wear off under normal cleaning. American Standard states the antimicrobial properties are permanent for the life of the toilet under normal residential use and conventional cleaning products.
How does the Studio S flush compare to the TOTO Drake?
The TOTO Drake is a two-piece toilet using TOTO's G-Max or Tornado flush engine, with MaP scores at or near 1,000g. Published MaP data positions the Drake as a stronger performer for flushing solid waste than the Studio S. The Studio S advantage is its skirted one-piece design and EverClean glaze; the Drake advantage is flush power and TOTO's CEFIONTECT glaze. They serve different buyer priorities.
Can I use a standard wax ring with the Studio S?
Yes, when the closet flange sits at or just above the finished floor surface. If the flange sits below the floor level -- common after tile installation adds height -- use an extra-thick wax ring or a wax-free adjustable seal. Do not compress a standard wax ring between a low flange and the toilet base, as an incomplete seal causes leaks and sewer gas infiltration.
Is the American Standard Studio S good for hard water areas?
The EverClean glaze resists bacteria and mildew but does not prevent mineral scale deposit from hard water. In areas with calcium and magnesium-heavy water, periodic descaling with a citric acid or diluted white vinegar treatment is still necessary. The smooth glaze surface does make mineral deposits easier to remove compared to a porous or matte-surface bowl.
How do I clean under the skirted trapway of the Studio S?
The fully skirted profile eliminates the external trapway ridges that are difficult to clean on exposed two-piece toilets. The base perimeter where the skirt meets the floor can be cleaned with a cloth or detailing brush. Because there are no external trapway grooves, cleaning the exterior of the Studio S is significantly faster than a traditional two-piece toilet.
What is the GPF of the American Standard Studio S?
The Studio S uses 1.28 gallons per flush (GPF), which meets the EPA WaterSense threshold of 1.28 GPF or less. This is a 20 percent reduction from the 1.6 GPF federal standard and complies with state regulations in California, Colorado, New York, Texas, and other states that mandate high-efficiency toilets. The Studio S is a single-flush design, not dual-flush.
Does the Studio S qualify for water utility rebates?
EPA WaterSense certification makes the Studio S eligible for rebate programs offered by many municipal and regional water utilities. Rebate amounts typically range from $50 to $200 per qualifying toilet. Check your local utility's website or the EPA WaterSense rebate finder tool to confirm current availability in your area before purchasing.
What is the weight of the American Standard Studio S?
The Studio S weighs approximately 100 to 115 pounds depending on the specific model SKU. As a one-piece toilet with an integrated tank and bowl, it cannot be separated for installation. Two-person installation is strongly recommended. A professional plumber will typically handle this single-trip, but homeowners installing without assistance should plan for proper lifting technique and protection for the floor.
How does the Studio S compare to the Woodbridge T-0001?
Both are skirted one-piece WaterSense-certified elongated toilets. The Studio S has the advantage of EverClean antimicrobial glaze, American Standard's larger domestic service network, the 10-inch rough-in option, and generally stronger owner ratings for long-term reliability. The Woodbridge T-0001 typically offers a lower purchase price, making it attractive for budget-first buyers willing to trade those features.
What toilet seat fits the American Standard Studio S?
The Studio S uses a standard elongated seat mounting pattern. The included SeatSolutions seat uses American Standard's specific hinge hole spacing, which matches most aftermarket elongated toilet seats with standard 5.5-inch hinge bolt spacing. When replacing the seat, confirm the hinge hole distance on the specific SKU before purchasing a replacement to avoid fitment issues.
Is the American Standard Studio S a pressure-assist or gravity-feed toilet?
The Studio S is a gravity-feed (gravity-flush) toilet. It relies on the weight and flow of water from the tank rather than compressed air to power the flush. Pressure-assist toilets, such as those using the Flushmate system, are louder and typically used in commercial or high-volume residential settings. The Studio S's gravity flush is quiet and sufficient for standard residential use.
Can the American Standard Studio S handle heavy flushing demands?
The Studio S performs reliably under standard residential use. For households with frequent heavy flushing demands -- large families, guest-heavy properties, or situations where large-diameter toilet paper is standard -- the American Standard Champion 4 (with its 4-inch piston-action flush valve and 1,000g MaP rating) is a better specification match. The Studio S is not the highest-capacity flush in American Standard's lineup.
What warranty does American Standard offer on the Studio S?
American Standard backs the Studio S with a 5-year limited warranty covering manufacturing defects in china, flushing components, and finish. Labor costs for repair under warranty are typically excluded. American Standard's warranty registration can be completed online after purchase, which is recommended to establish a clear warranty start date.
Does the Studio S come in colors other than white?
The Studio S is available in two finishes: White (#001) and Bone (#021). It is not offered in colonial gold, linen, or biscuit tones, which limits matching options for bathrooms with vintage or non-white fixture schemes. For non-white options in a skirted one-piece, Kohler and TOTO offer additional colorways in some models.
How loud is the American Standard Studio S flush?
As a gravity-feed siphonic toilet, the Studio S produces a moderate flush sound typical of 1.28 GPF toilets. It is quieter than pressure-assist models and comparable in noise level to other gravity-feed one-piece toilets such as the Kohler Cimarron or TOTO Drake. Owner reviews do not flag noise as a concern. Flush duration is approximately 2 to 4 seconds.
Is the American Standard Studio S good for elderly users?
The comfort-height design (17 to 19 inches from floor to seat) and ADA compliance make the Studio S well-suited for elderly users and individuals with limited mobility. The higher seat position reduces the effort required to sit and stand. For further accessibility, a raised toilet seat or grab bars installed on adjacent walls are recommended for users with significant mobility limitations.
Where is the American Standard Studio S manufactured?
American Standard manufactures toilet products in multiple facilities, including plants in the United States (as of published production data) and international locations. The specific manufacturing origin can vary by SKU and production run. American Standard's customer service can confirm current production origin for specific model numbers if this is a purchase consideration.
Sources
- EPA WaterSense, epa.gov/watersense
- MaP flush testing, map-testing.com
- Manufacturer published specifications
- American Standard product data sheets, americanstandard-us.com
- Aggregated owner reviews, major retail platforms
Our Verdict
The American Standard Studio S is a well-executed skirted one-piece toilet for buyers who want contemporary design, EPA WaterSense-certified efficiency, and antimicrobial EverClean glaze at a price significantly below TOTO's flagship one-piece lineup. Its mid-range MaP flushing performance handles normal residential demand comfortably, and the availability of a 10-inch rough-in option makes it genuinely useful for retrofitting older bathrooms. If maximum flushing power is the deciding factor, step up to the TOTO UltraMax II or the American Standard Champion 4. For everyone else who wants a cleaner-looking, easier-to-clean one-piece toilet at a reasonable price, the Studio S earns a clear recommendation.
How we rank & our data sources
We do not run physical lab tests. Rankings are built from published, verifiable data and real owner feedback, never paid placement.
- MaP (Maximum Performance) flush scores
- EPA WaterSense certification & GPF ratings
- Manufacturer specifications (trapway size, flush-valve, rough-in)
- Verified owner reviews from Amazon, Home Depot & Lowe’s
Researched by Marcus Bell · Last updated June 28, 2026 · Our review method
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