Casta DIVA or Swiss Madison? Toilets Compared in 2026
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In this Casta DIVA vs swiss madison toilet comparison, you see two one-piece elongated designs that share ADA-compliant comfort heights and standard 12-inch rough-ins. Both models prioritize water efficiency and modern aesthetics. The main difference lies in their flushing mechanisms. Casta DIVA uses a single-pressure air-assisted system, while Swiss Madison offers a dual-flush vortex option. You need to decide which flush style best fits your household’s usage patterns and maintenance preferences.
Key differences
| Aspect | Casta Diva Air-Pressure ADA One-Piece | Swiss Madison St. Tropez One-Piece Toilet |
|---|---|---|
| Flush Type | Air-Pressure Assisted | Dual Vortex |
| Flush Volume | 1.0 GPF | 1.1/1.6 GPF |
| Height Dimensions | 19.3 inches | 31.3 inches |
| Color Options | White, Brushed Gold, Silver, Dark Gray | Glossy White, Matte Black, Matte White, Glossy Black, Black, White with Black Hardware |
| Seat Features | Soft-close lid included | Not listed |
| Installation Kit | Pre-installed seat, wax ring, hardware | Not listed |
Which one should you choose?
Choose Casta Diva Air-Pressure ADA One-Piece if
- You want the lowest possible water usage at 1.0 GPF.
- You prefer a hygienic foot-kick or side-button flush.
- You need a pre-installed soft-close seat and mounting hardware.
Choose Swiss Madison St. Tropez One-Piece Toilet if
- You want flexibility between a low-volume and full flush.
- You prefer a wider range of color finishes like matte black.
- You value a scratch-resistant non-porous ceramic surface.
Verdict: Choose the Casta DIVA if you prioritize maximum water conservation and hands-free convenience. Pick the Swiss Madison if you want dual-flush versatility and more color customization. Both provide ADA height and one-piece construction.
Comparing Flush Systems and Efficiency
Flush mechanism
Casta DIVA uses an air-pressure-assisted system that relies on compressed air to drive a powerful siphon jet. This design requires no electricity but delivers strong flushing performance. Swiss Madison employs a dual-vortex flush that creates a cyclonic rinsing action to scrub the bowl. This mechanism offers two water volume options, allowing you to choose between 1.1 GPF for liquid waste and 1.6 GPF for solid waste. The Casta DIVA relies on a single 1.0 GPF flush volume. The Swiss Madison approach provides more control over water usage depending on the type of waste being disposed of.
Water conservation
Water efficiency is a key spec for both toilets. Casta DIVA operates at a fixed 1.0 gallons per flush. This volume meets EPA WaterSense criteria and achieves a MaP flush score of 1000g, indicating strong solid waste removal with minimal water. Swiss Madison offers a dual-flush option. The low-volume setting uses 1.1 GPF, while the high-volume setting uses 1.6 GPF. If you primarily use the lower setting, Swiss Madison may use slightly more water per flush than Casta DIVA. However, the ability to select the volume gives you flexibility. Casta DIVA is more consistent in its low water usage.
Flush power
Flush power is measured by the MaP score for Casta DIVA. It achieves 1000g, which indicates excellent solid waste removal capability in a single flush. This score is a standard metric for evaluating toilet performance. Swiss Madison does not list a specific MaP score in the provided data. It describes its dual-vortex system as providing superior waste disposal through cyclonic action. Without a quantified score, you cannot directly compare the measurable cleaning power. Casta DIVA provides a concrete data point for flush strength, while Swiss Madison relies on descriptive claims about its vortex technology.
Seat height
Both toilets feature ADA-compliant comfort heights, which are designed to make sitting and standing easier. Casta DIVA specifies a seat height of 17.2 inches. This is a standard ADA measurement. Swiss Madison is also described as having ADA chair height in its attributes. However, the product specs list various heights for Swiss Madison variations, ranging from 30.3 to 31.5 inches. The specific model SM-1T254 likely aligns with the ADA standard, but the data shows significant variation across the Swiss Madison line. Casta DIVA provides a precise, consistent height specification.
Included components
Installation ease depends on what is in the box. Casta DIVA includes a full installation kit. This package contains the pre-installed toilet seat, flush system, wax ring, and mounting hardware. You do not need to purchase these items separately. Swiss Madison data does not explicitly list the included components. It mentions standard rough-in compatibility and durable ceramic construction. You may need to source a seat, wax ring, or bolts separately if they are not included. Casta DIVA offers a more complete out-of-the-box solution for installation.
Which Toilet Fits Your Bathroom Needs
Users needing hands-free hygiene access
The Casta Diva offers foot-kick or side-button flushing for hands-free operation. This feature supports hygienic use and accessibility. You get a one-piece design with a 17.2-inch ADA height. The air-pressure system works without electricity. This combination provides convenience and power for users who prioritize touchless functionality in their daily routine.
Buyers wanting maximum water conservation
This model uses a single 1.0 GPF flush volume. It meets EPA WaterSense criteria for water conservation. The air-pressure-assisted flush delivers a powerful 1000g MaP score with less water. You get efficient performance without sacrificing cleaning power. If your goal is to minimize water usage while maintaining strong flush results, this spec profile fits your needs.
Those seeking flexible flush volume options
The Swiss Madison St. Tropez features a dual-vortex flush system. You can choose between 1.1 GPF and 1.6 GPF volumes. This allows you to adjust water usage based on waste type. The cyclonic rinsing action ensures effective bowl cleaning. If you prefer control over flush intensity and volume, this dual-option system offers practical versatility for different household needs.
Shoppers looking for color variety
Swiss Madison offers ten variations including Matte Black, Glossy Black, and White with Black Hardware. The Casta Diva has four color options. If you want a wider range of finishes to match your bathroom decor, the St. Tropez provides more choices. You get durable ceramic construction alongside these aesthetic options for a cohesive look.
The products compared
Casta Diva Air-Pressure ADA One-Piece
Best for: ADA compliance and hands-free hygiene
- Flush Type
- Air-pressure assisted
- Flush Volume
- 1.0 GPF
- Rough-In Size
- 12"
- Seat Height
- 17.2"
- Bowl Shape
- Elongated
- MaP Flush Score
- 1000g
View on Amazon: Casta Diva Air-Pressure ADA One-Piece Affiliate link
This Casta DIVA one-piece toilet combines a 17.2-inch ADA-compliant seat height with a 1.0 GPF air-pressure-assisted flush. The elongated bowl and skirted base offer a sleek profile, while the foot-kick or side-button activation allows hands-free operation without electricity. It delivers a powerful 1000g MaP flush score, ensuring efficient waste removal. This unit suits users seeking accessible height and hygienic convenience in a compact footprint.
Pros
- 17.2-inch ADA-compliant seat height for easier sitting and standing
- Air-pressure-assisted flush delivers a 1000g MaP score at 1.0 GPF
- Hands-free activation via foot-kick or side-button for hygiene
- One-piece design with skirted base and soft-close seat
Cons
- Limited to a single 1.0 GPF flush volume option
- No electric components or smart features like auto-open lids
- Only 1-year limited customer service warranty included
Good fit if
- You need an ADA-compliant height for accessibility
- You want hands-free flushing for better hygiene
- You are renovating a bathroom with low water pressure
Skip if
- You require a dual-flush system for variable water usage
- You prefer a standard 15-inch seat height
- You want a longer warranty period than one year
Verdict: Casta DIVA ADA One-Piece Air-Pressure Toilet provides a powerful, accessible flush for users prioritizing hygiene and compliance. It fits well in renovations where standard pressure is low or height accessibility is required.
Swiss Madison St. Tropez One-Piece Toilet
Best for: ADA height and water efficiency
- Flush Type
- dual flush
- Flush Volume
- 1.1/1.6 GPF
- Rough-In Size
- 12"
- Bowl Shape
- elongated
- Toilet Type
- one-piece
- Seat Height
- ADA Chair Height
View on Amazon: Swiss Madison St. Tropez One-Piece Toilet Affiliate link
The Swiss Madison St. Tropez is a one-piece elongated toilet with a 12-inch rough-in. It features ADA comfort height seating at 31.3 inches. The dual vortex flush uses 1.1 or 1.6 gallons per flush. The glossy white ceramic is scratch resistant. This model suits you if you want a durable, water-efficient fixture with a modern one-piece design.
Pros
- One-piece elongated design for easier cleaning
- ADA comfort height seat at 31.3 inches
- Dual flush options at 1.1 or 1.6 GPF
- Scratch-resistant non-porous ceramic construction
Cons
- Heavier build at 109 pounds
- Standard 12-inch rough-in only
- No included soft-close seat
Good fit if
- You need ADA height for easier access
- You want a one-piece toilet for easier cleaning
- You prefer water-efficient dual flush options
Skip if
- You require a 10 or 14-inch rough-in
- You prefer a two-piece toilet design
- You need a compact round bowl shape
Verdict: Swiss Madison St. Tropez One-Piece Toilet offers a durable, water-efficient solution for standard bathrooms. It fits buyers who value ADA height and a seamless one-piece design.
Specifications side by side
| Spec | Casta Diva Air-Pressure ADA One-Piece | Swiss Madison St. Tropez One-Piece Toilet |
|---|---|---|
| Flush Type | Air-pressure assisted | dual flush |
| Flush Volume | 1.0 GPF | 1.1/1.6 GPF |
| Rough-In Size | 12" | 12" |
| Seat Height | 17.2" | not stated |
| Bowl Shape | Elongated | elongated |
| MaP Flush Score | 1000g | not stated |
| Toilet Type | One-piece | one-piece |
| Design Style | Modern | not stated |
| Color | White | Glossy White |
| Shape | Elongated | Elongated |
| Design | One Piece | One Piece |
| Dimensions | 26.9 × 15 × 19.3 inches | 27 × 15.2 × 31.3 inches |
| Weight | not stated | 109 pounds |
| Model | CD-W001 | SM-1T254 |
| Size | not stated | 12" Rough-in |
Frequently asked questions
Which toilet is better for small bathrooms?
The Casta DIVA Air-Pressure ADA One-Piece is a stronger choice for tight spaces. Its length measures 26.9 inches, which is slightly shorter than the Swiss Madison St. Tropez at 27 inches. The Casta DIVA also has a narrower width of 15 inches compared to the Swiss Madison’s 15.2 inches. These smaller dimensions help it fit more comfortably in constrained layouts.
Do both toilets have ADA compliant seat heights?
Yes, both models feature ADA chair height seats. This design provides easier access and comfort for users who need a higher seating position. The Casta DIVA and the Swiss Madison St. Tropez both meet these accessibility standards. This shared feature makes either option suitable for households prioritizing ergonomic comfort and compliance with accessibility guidelines.
What is the difference in flush systems?
The Casta DIVA uses an air-pressure system that relies on compressed air for a powerful flush. The Swiss Madison St. Tropez utilizes a dual-flush mechanism. This allows you to choose between a full or partial flush for water efficiency. The Casta DIVA focuses on force, while the Swiss Madison offers selection options for different waste types.
Are these toilets one-piece designs?
Yes, both the Casta DIVA and the Swiss Madison St. Tropez are one-piece toilets. This design integrates the tank and bowl into a single unit. It eliminates seams where dirt and bacteria can accumulate, making cleaning easier. The seamless construction also contributes to a modern, streamlined aesthetic in your bathroom.
Which toilet is heavier?
The Swiss Madison St. Tropez is significantly heavier. It weighs 109 pounds, providing a solid, stable feel during use. The Casta DIVA does not list a specific weight in its specifications. The Swiss Madison’s substantial mass may contribute to its durability and reduced movement during flushing.
Do they fit standard rough-in sizes?
Yes, both toilets are designed for standard 12-inch rough-in installations. This is the most common measurement in US bathrooms. You do not need to modify your plumbing layout for either model. Ensure your existing setup matches this standard before purchasing to guarantee a proper fit.