Best Tankless Toilets in 2026: 6 Picks + Plumbing Requirements
The best tankless toilets hide the bulk, free wall space, and deliver a powerful flush without the porcelain tank. But they need things a tank toilet doesn’t: a 1-inch supply line, a flushometer or pump, and (for most models) a dedicated GFCI outlet. This guide reviews six tankless toilets with the plumbing prerequisites installers wish you’d read before ordering. See also wall-hung & rough-in details.
Why best tankless toilets need more than a flush valve
When tankless makes sense, and when it doesn’t
A tankless toilet hides the bulk, frees wall space, and looks like nothing else in your bathroom. The catch is plumbing: a true tankless flushes pressurized water straight from your supply through a flushometer valve, which means a 1-inch supply line and 25 PSI minimum static pressure. Most U.S. homes have half-inch lines and weren’t designed for this. Confirm both before you buy. If your plumbing supports a true flushometer, the closest residential equivalent is a Sloan Royal 111 flushometer paired with an American Standard Madera bowl. Both are off-the-shelf parts that a competent plumber can install. For the floating-bowl look without the supply-line headache, the Toto NEOREST 700H and Kohler Veil intelligent lead the smart category; the Geberit AquaClean Sela and Duravit Starck 3 are quieter and cheaper alternatives.
This guide separates the two categories (true tankless, with a direct flushometer, versus visually tankless, which uses a concealed tank) because the install requirements are wildly different.
Our picks at a glance
| Toilet | Flush mechanism | GPF | Min. supply line | Noise (approx.) | Smart features | Approx. price |
|---|---|---|---|---|---|---|
| Toto NEOREST 700H (MS9000C0) | Concealed in-body tank, pressure-assist | 1.0 / 0.8 dual | 1/2″ | ~70 dB | Auto-flush, heated seat, bidet, auto-lid | $6,500-$7,800 |
| Kohler Veil Intelligent | Concealed tank in carrier | 1.28 / 0.8 dual | 1/2″ | ~68 dB | Heated seat, bidet, dryer, motion lid | $4,800-$5,900 |
| Geberit AquaClean Sela | Concealed Sigma tank | 1.28 / 0.8 dual | 1/2″ | ~65 dB | Integrated bidet, remote | $3,200-$4,200 |
| Saniflo Sanicompact 023 | Macerating tankless (pump) | 1.0 | 1/2″ | ~75 dB | None | $850-$1,100 |
| Am. Std Madera + Sloan Royal 111 | Direct flushometer valve | 1.28 | 1″ minimum | ~78 dB | None | $400-$650 bowl + $300-$500 valve |
| Duravit Starck 3 wall-hung | Concealed tank | 1.28 / 0.8 dual | 1/2″ | ~66 dB | None (optional SensoWash) | $700-$1,100 + carrier $450-$700 |
Prices observed at Build.com, Ferguson, Home Depot, Lowe’s, and manufacturer direct in April-May 2026. Wall-hung models do not include the in-wall carrier or flush plate unless noted.
What is a tankless toilet, exactly?
A tankless toilet has no gravity-fed water tank. Instead of refilling a 1.6-gallon reservoir and dropping it through the bowl when you press the lever, a tankless toilet draws water on demand from your home’s pressurized supply. The flush is triggered by a flushometer valve (the same type you see in airports and offices) that opens for a few seconds, letting a metered slug of pressurized water blast through the bowl, then closes.
That’s why every office building has tankless toilets and most homes don’t. Commercial buildings are plumbed with large-diameter mains and high static pressure. Most U.S. homes use half-inch supply lines off a three-quarter-inch trunk, with 40-60 PSI static that drops when other fixtures draw. A real flushometer needs 25 PSI minimum while flowing through at least a 1-inch line, or the flush starves into a gurgle.
There’s a second category marketing calls tankless but technically isn’t: wall-hung toilets with concealed tanks. These hide a plastic tank inside a 2×6 stud bay and flush from a flat plate flush with the tile. They look tankless but are still gravity-fed; the tank is just hidden. They install on standard half-inch supply and are what most “tankless residential” round-ups actually recommend. We cover both categories below and label which is which on every pick, because the buying decision is completely different.
Who tankless toilets are for (and who they’re not for)
Good fit:
- Gut renovations where walls are open and you can drop in a 1″ line and a carrier without drywall demolition
- New construction where the supply-line upcharge is small at framing time
- Small bathrooms where tank depth is valuable square footage
- Minimalist design briefs where visual quiet matters more than $2,000 in budget
- Households wanting a mop-friendly floor: a wall-hung bowl lets one mop pass clear the floor
Bad fit:
- Older homes with half-inch supply and no plans to open walls: true tankless is off the table
- Low or variable water pressure: below 25 PSI a flushometer won’t work
- Well-system homes: pressure cycles 30-50 PSI, at the edge of flushometer tolerance
- Outage-prone areas with a smart toilet: every feature except (sometimes) the manual flush dies
- DIY-only households: this is not a Saturday swap.
The 6 best tankless (and concealed-tank) toilets in 2026
1. Toto NEOREST 700H (MS9000C0): best premium smart “tankless”
The NEOREST 700H is what most people picture when they say “smart tankless.” Sculpted one-piece in cotton white with no visible tank, auto-open lid, integrated washlet bidet, heated seat, warm-air dryer, and Toto’s eWater+ that mists the bowl with electrolyzed water after every flush. Flush is dual 1.0/0.8 GPF using Toto’s Cyclone design with pressure-assist boost. It is not a true flushometer, so no 1″ supply required. NEOREST 700H units installed in the late 2010s are still in service today.
Pros
- Tankless silhouette without a 1″ supply-line requirement
- Auto-flush, auto-lid, heated seat, bidet, dryer, deodorizer in one body
- eWater+ keeps the bowl visibly cleaner between cleanings
- Toto’s U.S. customer service is the best in smart toilets
Cons
- $6,500-$7,800 before installation
- Requires a dedicated GFCI outlet; older bathrooms need an electrician
- Smart features go dark in outages (flush still works manually)
- Proprietary seat and lid expensive to replace
2. Kohler Veil Intelligent Wall-Hung: best wall-hung smart pick
Buy this if you want the floating-from-the-wall look and you want it smart. Mounts to a Kohler in-wall steel carrier with a concealed tank; the bowl houses the heated seat, integrated bidet, warm-air dryer, motion-activated lid, and LED night light. Dual-flush 1.28/0.8 GPF on a standard half-inch line. Visually tankless, not true flushometer. The platform has been on the market since 2017; 2024+ units have substantially better water-temperature stability.
Pros
- True wall-hung silhouette; bowl floats 6-8″ off the floor for easy mopping
- Carrier supports 880 lb when properly anchored
- Mounting height adjustable during install (15″, 17″, or 19″ seat)
- Kohler dealer network is large for warranty service
Cons
- Wall must be opened to set the carrier; not a swap-in upgrade
- Carrier, plate, and bowl sold separately; full kit runs $5,300-$6,500 installed parts
- Servicing electronics requires removing the bowl from the wall
- Smart features die in outages; flush is louder than a standard Kohler (~68 dB)
3. Geberit AquaClean Sela: best European integrated bidet
Geberit invented the in-wall carrier system most other brands now license or copy. The Sela pairs a Geberit Sigma carrier with a slim ceramic bowl that has the bidet wand, optional heated seat, and dual-flush built in. The Sigma concealed tank is the quietest and most reliable in-wall flush mechanism on the market, in production since 1994 with backward-compatible parts. Most plumbers prefer the Sigma carrier even when fitting another brand’s bowl.
Pros
- Sigma carrier is the industry benchmark; parts available globally for 30+ years
- Quietest flush in this guide at roughly 65 dB
- Integrated bidet wand in the bowl ceramic; no separate seat needed
- Shallower projection than the Veil, better for tight bathrooms
Cons
- U.S. dealer network is thin compared to Toto or Kohler
- Heated seat is optional, adds $400-$600
- Cold-water-only bidet on the base model
- No auto-open lid, no dryer
- Carrier install is more involved (Sigma frame engineered for European studs)
4. Saniflo Sanicompact 023: best for basements (true tankless macerator)
The only true tankless toilet here at a realistic price; it’s affordable because it solves a different problem. The Sanicompact runs entirely on electric power: a built-in macerating pump grinds waste and pushes it through a 3/4″ or 1″ discharge that can run up to a sewer line as high as nine feet above the toilet and out as far as 120 feet horizontally. Push-button flush, 1.0 GPF, standard half-inch cold supply. Install it in a finished basement, attic suite, or ADU. It won’t win beauty contests, but for the use case there’s nothing else at this price.
Pros
- Installs anywhere with cold supply and a 120V outlet
- Discharges upward up to 9 feet vertical and 120 feet horizontal
- True tankless silhouette with a small footprint
- Turns a half-bath addition into a $1,500 project instead of $15,000
Cons
- Requires constant electrical power; does not flush during outages
- Loud; 75+ dB during the full pump cycle
- Only the toilet’s own waste on this model; no sink or shower tie-in
- Utilitarian aesthetics
- Macerator pump is a wear item; plan on service at 8-12 years
5. American Standard Madera + Sloan Royal 111: best true residential flushometer
The pick for the buyer who wants the commercial-toilet aesthetic at home and has the plumbing for it. The American Standard Madera is a real residential-rated commercial bowl ($400-$650 at plumbing supply, model 18065 family) with a top-spud inlet. Pair it with the Sloan Royal 111 (1.28 GPF), the same diaphragm flushometer used in the gym, office, and airport bathrooms you’ve used for decades, but in chrome trim for a home install. Plumber pairs the two, plumbs through the wall to a 1″ supply, and you get the fastest single-cycle flush in any U.S. residential bathroom.
Pros
- The only configuration in this guide using off-the-shelf, real-world residential parts
- Single-flush bowl-clearing that gravity toilets cannot match
- 25-year flushometer service life with minor diaphragm rebuilds
- No electronics, low long-term maintenance
- Bowl + valve cost less than a single smart toilet pick
Cons
- Hard requirement: 1″ supply and 25+ PSI. Most U.S. homes need a $400-$1,200 supply upgrade.
- Loud; 78 dB or more during the four-second flush
- Bowl and valve sold separately; match the spud size before you order
- No bidet, no smart features, no heated seat; plumber-only install
6. Duravit Starck 3 wall-hung: best minimalist budget pick
Buy this when you want the wall-hung look and don’t want to spend $5,000. The bowl alone is $700-$1,100 and mounts to any standard European carrier (Geberit Sigma, TECE, Grohe Rapid SL) at the installer’s preference. Designed by Philippe Starck in the late 1990s, still in production with refreshed glazes and a HygieneFlush rimless option for 2024. Dual-flush plate options (chrome, matte black, brushed nickel, white) let you tune the visible hardware.
Pros
- Cheapest credible wall-hung bowl by a wide margin
- Works with any standard European carrier (plumber picks the brand they trust)
- HygieneFlush rimless variant has no rim catch points
- Optional SensoWash bidet seat upgrade path
- 25-year design pedigree, still looks current
Cons
- Bowl sold alone; budget $450-$700 for carrier and $80-$300 for plate
- No integrated features in the base model
- Wall must be opened for carrier installation
- Duravit U.S. customer service is slower than Kohler or Toto
- Flush performance is good, not great; par with domestic dual-flush gravity
Pre-purchase plumbing checklist
Walk through this before you commit. If you can’t tick every applicable box, the project gets a lot more expensive, or it doesn’t happen.
1. Measure your water pressure. A $12 hose-bib gauge screws onto an outdoor spigot. Take readings early morning, evening peak, and Saturday noon. You need static of at least 40 PSI for a true flushometer (Madera + Sloan Royal). Concealed-tank wall-hung are happy at 25 PSI or above.
2. Identify your supply line size. Look under the nearest sink. A half-inch copper line measures roughly 5/8″ outside diameter; a 1″ line measures about 1-1/8″. If unsure, snap a photo and ask at the plumbing counter.
3. Check your electrical situation. Smart tankless (NEOREST, Veil, AquaClean with heat) need a GFCI outlet within three feet. Pre-1990s homes often don’t have one; budget $150-$350 for an electrician.
4. Confirm wall depth. Wall-hung toilets need a 2×6 stud bay for the in-wall carrier. Standard 2×4 walls require furring out first.
5. Verify the drain location. Floor-mount tankless (Madera + Sloan Royal) uses the same 12″ rough-in as a standard toilet. Wall-hung toilets discharge through the back wall. The existing floor drain has to be rerouted up into the wall.
Installation considerations
A tankless toilet is not a DIY swap. A gravity toilet installed slightly off won’t leak immediately; a flushometer with the wrong spud orientation or a wall-hung with an under-anchored carrier will fail in ways that destroy drywall and finished flooring.
Hire a licensed plumber. Get at least two quotes. The job includes confirming supply size and pressure before mounting, setting the in-wall carrier into framing rated for 880+ lb dynamic load, connecting the flushometer correctly, pressure-testing before drywall closes, and coordinating with an electrician for smart models. Wall-hung installs are a two-stage project: rough-in before drywall and tile, bowl install after. For general installation, see our how to install a toilet walkthrough, but tankless installs go well beyond what’s covered there.
Cost breakdown: what you’ll actually spend
Sticker prices on tankless toilets don’t tell the real story because supporting work often equals the toilet itself. Realistic 2026 installed budgets:
- True flushometer (Madera + Sloan Royal): $400-$650 bowl + $300-$500 valve + $800-$1,400 plumber + $400-$1,200 supply upgrade = $1,900-$3,750
- Smart one-piece (NEOREST 700H): $6,500-$7,800 toilet + $400-$700 plumber + $150-$350 electrician = $7,050-$8,850
- Smart wall-hung (Veil, AquaClean): $3,200-$5,900 bowl + $500-$900 carrier + $1,200-$2,000 plumber + $150-$350 electrician + $400-$1,500 drywall/tile = $5,450-$10,650
- Macerating (Sanicompact 023): $850-$1,100 toilet + $500-$900 plumber + $150-$300 electrician = $1,500-$2,300
- Budget wall-hung (Duravit Starck 3): $700-$1,100 bowl + $530-$1,000 carrier/plate + $1,200-$2,000 plumber + $400-$1,500 drywall/tile = $2,830-$5,600
Even the cheapest wall-hung path lands at $3,000+ installed. Tankless is not where you save money up front. For the floating-bowl aesthetic for less, some one-piece toilets with a low-profile skirted tank approximate the look at a quarter of the price.
Frequently asked questions
Do tankless toilets need electricity?
Depends on the type. A true flushometer tankless like the Madera + Sloan Royal pairing uses a manual valve and needs no electricity to flush. Smart tankless (NEOREST, Veil) need a GFCI outlet for the heated seat, bidet, and electronics; the flush is mechanical on most models and works during outages, but every other feature goes dark. Macerating tankless like the Sanicompact 023 require constant electrical power. Without it the toilet does not function at all.
How loud is a tankless flush?
A true flushometer registers 75-82 dB, comparable to a vacuum cleaner. Standard gravity toilets flush at 55-65 dB. Concealed-tank wall-hung (Veil, Geberit, Duravit) sit in the 65-70 dB range. The NEOREST runs around 70 dB. The Sanicompact is loudest at 75+ dB and the noise continues for the full pump cycle.
Can I install a tankless toilet myself?
No. Flushometers require correctly sized supply, calibrated valve throw, and proper spud alignment; getting any wrong creates leaks at full supply pressure. Wall-hung toilets require anchoring a carrier rated for 880+ lb into framing. Hire a licensed plumber.
What water pressure do tankless toilets need?
True flushometer tankless need 25 PSI minimum static (most plumbers want 35+) through a 1-inch supply line. Concealed-tank wall-hung work on standard half-inch supply at any pressure above 20 PSI since the hidden tank refills slowly. The NEOREST also works on half-inch at 20+ PSI.
Do tankless toilets work during power outages?
True flushometer tankless (manual valve) work normally during outages, driven by water pressure rather than electricity. Most smart tankless retain manual flush via a hidden mechanical button. Macerating tankless like the Sanicompact do not work at all during outages. Plan accordingly in outage-prone areas.
Are tankless toilets more water-efficient?
Modestly. A flushometer at 1.28 GPF uses the same volume as a 1.28 GPF gravity toilet: faster and more powerful, same water. Dual-flush concealed-tank models at 1.28/0.8 GPF are slightly more efficient. The NEOREST 700H is most efficient at 1.0/0.8 GPF. Buy tankless for aesthetics, not water savings.
What happens if water service stops?
A true flushometer cannot flush without pressure. There’s no reservoir. A concealed-tank wall-hung has one flush left in the hidden tank, then nothing. The strongest argument against tankless in areas with frequent shutoffs, well issues, or cistern households. A standard gravity toilet’s 1.6-gallon tank is meaningful resilience.
Are tankless toilets harder to maintain?
Bowls are easier to keep clean: no tank to develop mineral buildup or flapper leaks. But supporting hardware adds maintenance: flushometer valves need diaphragm replacement every 5-7 years ($30 part), and smart electronics, heaters, and bidet wands fail more frequently than any part of a gravity toilet. Net-net, tankless are more dependent on professional service.
Final recommendations
If your home has a 1″ supply stub and you actually want a commercial-style flushometer, the American Standard Madera bowl + Sloan Royal 111 flushometer is the only true tankless here. Both are real, off-the-shelf parts from a plumbing supply house, and any competent plumber can install the pair.
For most buyers, the right answer is a concealed-tank wall-hung that looks tankless without the supply-line nightmare. The Kohler Veil Intelligent is the most credible smart option in the U.S. because Kohler has the dealer network to service it. The Geberit AquaClean Sela delivers European refinement and the quietest flush in the category. The Duravit Starck 3 is the value play: same floating-bowl look at a third of the smart-pick price.
The Toto NEOREST 700H is its own category: all-in-one smart one-piece with no tank silhouette and no special plumbing requirements. And if your problem is a basement with no drain, the Saniflo Sanicompact 023 solves a problem none of the others can touch.
Do the pressure test and supply-line measurement before you order. Returns on $5,000 wall-hung systems are not fun.
For more on choosing the right toilet, see our guides to best elongated toilets, Kohler vs American Standard, and how to measure toilet rough-in. For authoritative water-efficiency ratings, see the EPA WaterSense product database.
Author: Ariel, bathroom remodeler. Last updated May 28, 2026. We update this article whenever a recommended product is discontinued or replaced.
