My shortlist favors complete systems when a concealed cistern is part of the brief: the Los Flexi includes an adjustable carrier and a stated 0.8/1.6 GPF flush, while the Eridanus 2×6 pairs a supplied carrier with a rimless bowl and flush plate. For buyers planning around narrower framing, the Eridanus 2×4 is the more targeted fit. The Swiss Madison Sublime is a bowl-only option, so its appeal depends on choosing a compatible carrier separately.
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The tradeoff is not just bowl shape or flush volume. I weigh what comes in the box, the carrier’s compatibility with the wall cavity, and how much installation planning each system demands. A floating toilet can free floor space and simplify floor cleaning, but it requires a suitable in-wall support and plumbing arrangement; a lower flush volume is useful only if the complete setup fits the project. My ranking puts complete, clearly specified systems ahead of a bowl that leaves the cistern purchase to you.
Complete the kit
Key Takeaways
- Los Flexi is the most complete general-purpose pick here: bowl, adjustable carrier, dual-flush plate, and installation accessories are listed together.
- Eridanus 2×6 is the best match for a project designed around 2×6-inch framing, with a rimless bowl and carrier system included.
- Eridanus 2×4 addresses a narrower framing requirement, but the supplied details give less dimensional and flush-volume information than the 2×6 model.
- Swiss Madison Sublime includes a seat and adjustable bowl height, but you must source the compatible in-wall carrier and actuator plate separately.
- Confirm wall framing, carrier compatibility, plumbing access, and the installation plan before choosing any wall-hung toilet.
| Los Flexi Elongated Wall-Hung Toilet System with Adjustable Tank Carrier |  | Best Overall — a complete system with a notably adjustable carrier | Installation: Wall mounted | Flush options: 0.8 and 1.6 GPF | Carrier adjustment: 0 to 7⅞ inches | VIEW ON AMAZON | See Our Full Breakdown |
| Eridanus Wall-Hung Toilet with 2×6-Inch In-Wall Tank Carrier and Dual Flush |  | Best for 2×6 framing — a rimless supplied system | Model: ERI-WT421 | Carrier format: 2×6-inch in-wall tank carrier | Bowl: Ceramic, rimless | VIEW ON AMAZON | See Our Full Breakdown |
| Eridanus Wall-Hung Toilet with 2×4 In-Wall Tank Carrier and Dual Flush |  | Best for 2×4 framing — a supplied carrier in a narrower format | Model: ERI-WT421 | Carrier format: 2×4 in-wall tank carrier | Installation: Wall mounted | VIEW ON AMAZON | See Our Full Breakdown |
| Swiss Madison SM-WT449 Sublime Wall-Hung Toilet Bowl |  | Best bowl-only choice — flexible carrier pairing, but extra sourcing required | Model: SM-WT449 | Installation: Wall mount | Material: Porcelain | VIEW ON AMAZON | See Our Full Breakdown |
| wall hung toilet with concealed cistern | Warranty | Installation | Dimensions | Seat |
|---|---|---|---|---|
| Los Flexi Elongated Wall-Hung | 2 years | Wall mounted | 22.45 × 14.79 × 13.25 inches (D × W × H) | Soft-close, quick-release |
| Eridanus Wall-Hung Toilet with | One-year limited warranty; lifetime after-sales service | — | 20.87 × 14.57 × 14.17 inches | — |
| Eridanus Wall-Hung Toilet with | One-year limited warranty; lifetime after-sales service | Wall mounted | — | Polypropylene, soft-close |
| Swiss Madison SM-WT449 Sublime | One-year limited warranty listed in product information | Wall mount | 22 × 14.5 × 14.5 inches (D × W × H) | Plastic soft-close, quick-release |
More Details on Our Top Picks
Los Flexi Elongated Wall-Hung Toilet System with Adjustable Tank Carrier
Los Flexi earns my top spot because it brings together the parts a concealed-cistern project actually needs: an elongated ceramic bowl, tank carrier, dual-flush actuator plate, seat, and installation accessories. That makes it a simpler starting point than the Swiss Madison Sublime, which supplies the bowl and seat but leaves the carrier and plate to the buyer. The supplied carrier’s stated height adjustment from 0 to 7⅞ inches also gives the installer more scope to set the bowl position around household needs and project constraints.
The flush figures are clearly stated at 0.8 and 1.6 GPF, giving the user two options rather than a single flush setting. Its soft-close, quick-release seat is practical for quieter closing and easier seat removal during cleaning. The elongated shape may suit buyers who prefer more front-to-back room, though the listed depth of 22.45 inches means I would check the finished projection against the bathroom plan instead of assuming it is the most compact choice.
Compared with the Eridanus options, Los Flexi has a more clearly described adjustment range and flush volumes, while Eridanus highlights rimless bowls and framing-specific carrier formats. Its tradeoffs are the more involved in-wall installation, a stated two-year warranty, and delivery in two packages. I would choose it for a renovation where a broad, included system and adjustability matter more than a rimless design or a specified 2×4/2×6 carrier format.
Pros:- Carrier, bowl, dual-flush plate, seat, and installation accessories are included.
- Carrier height is stated as adjustable from 0 to 7⅞ inches.
- 0.8 and 1.6 GPF flush options are specified.
- Quick-release soft-close seat supports quieter use and easier cleaning.
Cons:- In-wall installation requires more planning than a floor-mounted toilet.
- The system ships in two packages, which may complicate scheduling.
- The listed 22.45-inch depth may not suit bathrooms with limited projection.
Best for: Renovators who want the bowl, adjustable carrier, flush plate, seat, and accessories listed as one system, with stated flush volumes and room to adjust installation height.
Not ideal for: Buyers working to a strict 2×4 or 2×6 framing requirement who need that format explicitly stated, or anyone seeking the simplest toilet installation.
- Installation:Wall mounted
- Flush options:0.8 and 1.6 GPF
- Carrier adjustment:0 to 7⅞ inches
- Dimensions:22.45 × 14.79 × 13.25 inches (D × W × H)
- Seat:Soft-close, quick-release
- Materials:Ceramic, stainless steel, and urea formaldehyde
- Included:Bowl, tank and carrier, black actuator plate, seat, installation accessories
- Warranty:2 years
Our verdict“I rank Los Flexi first for buyers who want a well-specified, adjustable concealed-cistern system rather than a bowl-only purchase.”
Eridanus Wall-Hung Toilet with 2×6-Inch In-Wall Tank Carrier and Dual Flush
This Eridanus package stands out for buyers whose bathroom plan already calls for a 2×6-inch in-wall carrier. The listing includes the ceramic bowl, cover and seat, carrier system, dual-flush plate, and mounting accessories, so it is a more complete concealed-cistern purchase than the Swiss Madison bowl. Its rimless bowl is the main everyday differentiator: with fewer rim contours to work around, cleaning the bowl can be more direct than with a conventional rimmed design.
The floating layout also leaves the floor below the bowl accessible for routine cleaning. The supplied description identifies a double-jet rimless dual-flush system, but it does not give flush-volume figures, carrier adjustment range, or the same level of dimensional detail available for Los Flexi. That makes this a sensible framing-led choice, not the clearest pick for buyers comparing exact water use or height settings.
Compared with the Eridanus 2×4 model, this version is explicitly specified for 2×6-inch framing, which helps narrow the choice when the wall build is known. The two Eridanus products otherwise share a rimless, floating approach and a one-year limited warranty with lifetime after-sales service described in the listing. The main practical catch is that the toilet and tank ship separately and may arrive at different times; I would plan installation only after confirming both parts are on hand.
Pros:- 2×6-inch in-wall carrier format is explicitly identified.
- Carrier, dual-flush plate, bowl, seat, and mounting accessories are listed as included.
- Rimless bowl and floating installation can make routine cleaning easier.
- Soft-close seat is included.
Cons:- Bowl and tank ship separately and may arrive at different times.
- Flush-volume figures and carrier height-adjustment range are not supplied.
- One-year limited warranty is shorter than the stated Los Flexi coverage.
Best for: Buyers building or renovating around 2×6-inch framing who want the carrier, plate, and rimless bowl supplied as a coordinated system.
Not ideal for: Projects with 2×4 framing, shoppers who need stated flush-volume figures or detailed height-adjustment data, and anyone working to a fixed installation date.
- Model:ERI-WT421
- Carrier format:2×6-inch in-wall tank carrier
- Bowl:Ceramic, rimless
- Flush:Dual flush, double-jet rimless
- Dimensions:20.87 × 14.57 × 14.17 inches
- Included:Bowl, cover and seat, carrier, flush plate, mounting accessories
- Color:White
- Warranty:One-year limited warranty; lifetime after-sales service
Our verdict“I recommend this Eridanus when 2×6 framing and a supplied rimless system matter more than detailed flush-volume specifications.”
Eridanus Wall-Hung Toilet with 2×4 In-Wall Tank Carrier and Dual Flush
The Eridanus 2×4 is the frame-specific alternative for buyers who cannot use the 2×6 carrier format. It includes a 2×4 in-wall tank carrier, rimless bowl, soft-close seat, dual-flush plate, and mounting accessories, making it more directly suited to a full concealed-cistern installation than the bowl-only Swiss Madison. Its floating installation leaves floor space open, while the rimless bowl avoids the more involved rim contours found on traditional toilet designs.
Compared with the 2×6 Eridanus, the distinction is primarily the carrier format, not a clearly documented change in bowl design. The supplied details mention adjustable seat height but do not provide a numerical adjustment range, bowl dimensions, or flush volumes. Buyers who need those details for a tight layout or water-use comparison should ask for current product documentation before committing. By contrast, Los Flexi lists dimensions and explicit flush rates, giving it an advantage when specifications are the deciding factor.
The included plate and seat make this a more complete package than the Swiss Madison, but a wall-hung toilet still depends on correct framing, plumbing, and installation. As with the other Eridanus option, the bowl and tank are shipped separately and may arrive at different times. I would select this model when 2×4 carrier compatibility is the deciding constraint, not just because the product title sounds compact; the supplied information does not establish a smaller finished projection than the other models.
Pros:- 2×4 carrier format is identified for framing-led selection.
- Carrier, flush plate, bowl, seat, and mounting accessories are listed as included.
- Rimless bowl and raised installation can ease floor and bowl cleaning.
- Soft-close seat and dual-flush plate are included.
Cons:- The bowl and carrier ship separately and may arrive at different times.
- No bowl dimensions or flush-volume figures are supplied in the provided details.
- In-wall installation requires a suitable carrier and planned access to concealed plumbing.
Best for: Renovators whose wall framing or project plan calls for a 2×4 carrier and who want a rimless, supplied-system option.
Not ideal for: Buyers who do not know their framing, need published dimensions and flush-volume figures before purchase, or cannot accommodate separate-package delivery.
- Model:ERI-WT421
- Carrier format:2×4 in-wall tank carrier
- Installation:Wall mounted
- Bowl:Rimless; material details not specified in supplied listing
- Flush:Dual flush; volume figures not specified
- Seat:Polypropylene, soft-close
- Included:Bowl, cover and seat, carrier, flush plate, mounting accessories
- Warranty:One-year limited warranty; lifetime after-sales service
Our verdict“This is the Eridanus to shortlist when 2×4 framing is the key requirement, provided you verify dimensions and flush details before ordering.”
Swiss Madison SM-WT449 Sublime Wall-Hung Toilet Bowl
Swiss Madison’s Sublime is the outlier in this roundup: it is a wall-hung bowl with seat, not a complete concealed-cistern system. The bowl is compatible with most major carrier brands, and its adjustable height gives a project some fitting flexibility, but the in-wall carrier and actuator plate are sold separately. That arrangement can suit a buyer who already has a chosen carrier or is matching an existing system; for a shopper starting from scratch, Los Flexi and both Eridanus packages are more straightforward because their carrier and plate are listed in the box.
The listed dual-flush options, 0.8 and 1.28 gallons, are lower on the larger flush figure than Los Flexi’s stated 1.6 GPF setting. The seat is soft-close and quick-release, and the round bowl measures 22 inches deep by 14.5 inches wide. Its stated 14.5-inch height and adjustable setup may help with project planning, but buyers should confirm the final installed height with the carrier they select.
Compared with the Eridanus models, Sublime offers a clearly described bowl and compatibility with many carrier brands, but it gives up the convenience of a bundled tank system and flush plate. Its one-year limited warranty is also shorter than Los Flexi’s stated two-year warranty. I place it fourth for this particular search because the concealed cistern is a central part of the request, not an optional accessory. It makes the most sense when separate sourcing is deliberate, not accidental.
Pros:- Compatible with most major carrier brands according to the listing.
- 0.8- and 1.28-gallon dual-flush options are stated.
- Soft-close quick-release seat is included.
- Adjustable height and round bowl suit projects needing fit flexibility.
Cons:- In-wall carrier and actuator plate are sold separately.
- Separate sourcing adds compatibility checks and project coordination.
- One-year limited warranty is shorter than Los Flexi’s stated coverage.
Best for: Buyers who already own or have selected a compatible carrier and actuator plate, and want a round porcelain wall-hung bowl with an included seat.
Not ideal for: Shoppers seeking a complete toilet-and-cistern package or anyone who does not want to research carrier and actuator compatibility.
- Model:SM-WT449
- Installation:Wall mount
- Material:Porcelain
- Shape:Round
- Dimensions:22 × 14.5 × 14.5 inches (D × W × H)
- Flush options:Dual flush, 0.8 and 1.28 gallons
- Seat:Plastic soft-close, quick-release
- Carrier and actuator:Sold separately; compatible with most major carrier brands
- Warranty:One-year limited warranty listed in product information
Our verdict“I would choose the Sublime only when a separate carrier purchase is part of the plan; it is less convenient as a complete concealed-cistern solution.”
How We Picked
I ranked these options for shoppers specifically seeking a wall-hung toilet with a concealed cistern, rather than judging the bowls as standalone fixtures. My first distinction is whether a carrier and flush plate are included: that changes what must be sourced and coordinated before installation. Swiss Madison’s bowl is compatible with many major carrier brands, but the carrier and actuator are sold separately, so I placed it below the supplied-system options for a buyer who wants a one-package starting point.
Next, I compared the installation details buyers can act on: Los Flexi’s stated 0–7⅞-inch carrier height adjustment, Eridanus’s 2×6- and 2×4-inch carrier formats, and the Swiss Madison bowl’s adjustable height. I also looked at useful everyday differences, including dual-flush figures where provided, rimless bowl design, quick-release seating, and stated dimensions. These features affect fit, cleaning, and water-use choices; they do not replace checking local plumbing requirements or the carrier manufacturer’s installation instructions.
Finally, I gave weight to practical limitations. Separate-package shipping can delay a project, a bowl-only purchase adds compatibility work, and concealed systems are less straightforward to access than a conventional floor-mounted toilet. Warranty information is included where supplied, but the stated coverage differs and should be checked against current seller documentation. My ranking reflects completeness, fit-specific usefulness, and clarity of the supplied details, not a claim that every option suits every bathroom.
| wall hung toilet with concealed cistern | Installation | Seat | Included | Model |
|---|---|---|---|---|
| Los Flexi Elongated Wall-Hung | Wall mounted | Soft-close, quick-release | Bowl, tank and carrier, black actuator plate, seat, installation accessories | — |
| Eridanus Wall-Hung Toilet with | — | — | Bowl, cover and seat, carrier, flush plate, mounting accessories | ERI-WT421 |
| Eridanus Wall-Hung Toilet with | Wall mounted | Polypropylene, soft-close | Bowl, cover and seat, carrier, flush plate, mounting accessories | ERI-WT421 |
| Swiss Madison SM-WT449 Sublime | Wall mount | Plastic soft-close, quick-release | — | SM-WT449 |
Factors to Consider When Choosing Wall Hung Toilet With Concealed Cistern
Before choosing a bowl, I would confirm that the concealed carrier and finished wall can work with the bathroom’s framing, plumbing, and intended seat height. The included parts and the carrier format are the main differences among these four options.Check whether the cistern and plate are included
Start with the package contents, not the bowl photo. Los Flexi and both Eridanus models list a carrier and flush plate, while Swiss Madison sells the bowl separately from both. A bowl-only purchase can be a good match when you already have a carrier selected, but it creates an extra compatibility task: check the bowl-to-carrier mounting arrangement, flush plate compatibility, and the carrier’s installation requirements before ordering. Avoid assuming that a brand’s broad compatibility statement covers every particular carrier or actuator combination.
Match the carrier to the wall construction
The Eridanus versions make this choice visible in their product names: one is specified for 2×6-inch framing, the other for 2×4-inch framing. Confirm what the carrier dimensions mean for your actual wall build, including finished wall thickness and any required reinforcement. Los Flexi lists an adjustable carrier height but does not identify a 2×4 or 2×6 format in the supplied details. If framing is already closed or difficult to change, have an installer verify the carrier fit before purchase; a bowl’s listed dimensions alone do not establish that the concealed tank will fit.
Plan seat height and projection from finished surfaces
Wall-hung toilets allow the bowl to be set at a chosen height, but that setting depends on the carrier and installation. Los Flexi gives a carrier adjustment range, and Swiss Madison describes its bowl height as adjustable; the Eridanus 2×4 listing also mentions adjustable seat height without a numerical range. Compare finished seat height and bowl projection, rather than relying on a product’s raw dimensions alone. Account for tile, wallboard, mounting hardware, the user’s needs, and clearance in front of the bowl.
Compare flush information carefully
Los Flexi states 0.8 and 1.6 GPF, while Swiss Madison lists 0.8 and 1.28 gallons. The Eridanus descriptions identify dual flush but do not provide volume figures in the supplied information. Those differences can help narrow the field, but I would verify current specifications and local requirements before treating any figure as a final water-use comparison. Flush performance also depends on the installed system, plumbing, and correct setup; a lower stated volume alone does not settle which toilet fits your household.
Weigh cleaning design against service access
A suspended bowl leaves the floor beneath it open, which can make sweeping and mopping easier than around a floor-mounted base. The Eridanus bowls are described as rimless, while Los Flexi and Swiss Madison emphasize quick-release seats that can be removed for cleaning. The concealed tank also means some components sit behind the wall. Ask how the carrier is serviced through its access opening and make sure the installation follows the manufacturer’s instructions; convenient floor cleaning should not come at the cost of ignoring maintenance access.
Allow time for installation and delivery
Wall-hung systems need a secure carrier, careful plumbing coordination, and a finished wall built around the installation. They are not direct replacements for every floor-mounted toilet. Los Flexi and both Eridanus models are described as shipping in two packages or separately, so confirm that all components have arrived before booking installation. Swiss Madison requires a separately purchased carrier and actuator plate, adding another item to coordinate. I would schedule work after checking the complete parts list and confirming that the installer is familiar with the selected carrier.
Frequently Asked Questions
Which option includes the concealed cistern carrier?
Los Flexi and both Eridanus systems list an in-wall tank carrier with the bowl and flush plate. The Swiss Madison SM-WT449 is a bowl-only choice: its carrier and actuator plate are sold separately. I would verify the package contents at purchase, especially when coordinating multiple shipments.
Which toilet is intended for 2×4 framing?
The Eridanus Wall-Hung Toilet with 2×4 In-Wall Tank Carrier is the option explicitly identified for a 2×4 carrier format. The other Eridanus package is specified for 2×6 framing. Confirm the required cavity, finished wall dimensions, and installation instructions with a qualified installer rather than choosing based only on the framing label.
Can I install a wall-hung toilet in any bathroom?
No. A wall-hung toilet needs a suitable carrier, appropriate framing or structural support, and plumbing that can connect to the concealed system. The wall must also allow the carrier and tank to fit while preserving access for service. Have the intended installation checked before buying, particularly if the bathroom walls are already finished or the project involves changing existing plumbing.
Which options state their dual-flush volumes?
Los Flexi lists 0.8 and 1.6 GPF, and Swiss Madison lists 0.8 and 1.28 gallons. The Eridanus descriptions say dual flush but do not give specific flush-volume figures in the supplied product details. Check current product documentation and local requirements if exact flush volume is important to your decision.
Do these packages include everything needed for installation?
Los Flexi and the two Eridanus listings include a carrier and flush plate along with the bowl and seat, but that does not mean every project material, plumbing connection, tool, or labor item is included. Swiss Madison specifically excludes the carrier and actuator plate. Review each current parts list and installation manual, and confirm compatibility before arranging the work.
Conclusion
For the broadest all-in-one starting point, I would choose Los Flexi: it has the clearest stated carrier adjustment, flush volumes, and included system components. If your wall plan specifies 2×6 framing, the Eridanus 2×6 adds a rimless bowl and supplied carrier; if it specifies 2×4 framing, select the corresponding Eridanus 2×4 after checking the missing dimensions and flush figures. I would reserve the Swiss Madison Sublime for buyers who already have a compatible carrier and want to select the concealed tank components separately. In every case, verify framing, finished projection, plumbing, package contents, and service access before ordering.
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