9 Best Tankless Toilets with High Pressure Flushing – Reviews

The American Standard Madera might seem like a regular plain tankless toilet, but it isn’t. Otherwise called the Madera 3451, this tankless toilet is perfect for tiny homes with small bathrooms, and its stunning visual ascent suits any space. 

The Madera EverClean is a floor-mounted, elongated piece made from vitreous china material and coated with the EverClean protective glaze, positioning it for minimal care. 

It has a rim height of 15-inches and is about 56.4 pounds heavy. Though not ADA compliant, it is suitable for most persons, including children. The tankless toilet is said to have a carrying capacity of up to 1000 pounds. 

Most American Standard tankless toilets are known for their high-pressure system, and the Madera 3451 is no different. It uses a pressure-assisted system that optimizes the 1.1/1.6GPF ratings of manual flushometer valves.

The American Standard Madera is unsuitable for locations with water pressure below 25psi and requires a supply line 1-inch wide to support its high-pressure needs. This tankless toilet is CALGreen, WaterSense, and HET certified. 

The Madera comes with a 1.5-inch top inlet spud, a condensation channel for moisture control and two bolt caps. But, it is not packed with a seat or the manual flushometer valve. 

It is compatible with the standard 12-inch rough-ins, suitable for most bathrooms’ configurations. Because of its 10 by 12-inch water surface area and 2 ⅛-inch fully glazed trapway, its siphon action is even better. 

Still, some customers have reported its bowl scouring power is not as great as expected. However, most customers have posted above satisfactory reviews on this toilet. 

And since it takes care of most toilet flaws, including purchasing cost, we made it our number one pick on our list. 

The Madera 3451 Flowise Toilet is available in four different models: 

• The 3451001 Elongated Bowl only, Top Spud
• The 3452001 Elongated Bowl only, Top Spud with slotted rim for bedpan holding
• The 3453001 Elongated Bowl only, Back Spud
• The 3455001 Elongated Bowl only, Back Spud with slotted rim for bedpan holding

*The model displayed above is the 3451001 design.

Color Choice:

• White

The 2234 Madera, the 3451 Madera; what’s the difference? But first, we should identify their similarities.

The Madera 2234 is a beautiful-designed, floor-mounted tankless toilet with an elongated bowl. Like the 3451, it is made from vitreous china and has a rim height of 15-inches. 

The 2234 toilet uses the pressure-assisted siphonic-jet flush that supports manual flushometer valves of 1.1/1.6GPF ratings. As a result, it is not only CALGreen and WaterSense-certified, it is also a HET (high-efficiency toilet).

The American Standard 2234 Madera is most suitable for buildings with water pressures of 25 to 80psi and has a water surface area of 10 by 12-inch to enhance its flush system. It also has a 2 ⅛-inch trapway and a condensation channel for moisture control. 

However, the Madera 2234 lacks the proprietary EverClean glaze of the American Standard toilets. It requires a water supply line of 1 inch and is compatible with two rough-in sizes: the 10-inch and the 12-inch due to its adjustable tailpiece.

Like the Madera EverClean, the American Standard 2234 Madera toilet comes with a 1.5-inch top inlet spud and two bolt caps – but is not packed with a flushometer valve or a seat. 

As expected from the review champion, this tankless toilet has received several five-star ratings on various e-commerce platforms.

The Madera 2234 Toilet is available in three different models: 

• The 2234.001 Elongated Bowl only, Top Spud
• The 2623.001 Elongated Bowl only, Top Spud with slotted rim for bedpan holding (White only)
• The 2624.001 Elongated Bowl only, Back Spud

*The model displayed above is the 2234.001 design.

Color Choice:

• White

You probably already have an earful of floor-mounted tankless toilets, so let’s switch things up a bit with a wall-mounted, elongated piece, which is also a product of the American Standard brand.  

Unlike floor-mounted designs, the Afwall Millennium Flowise lets you mount it at whatever height you prefer: high enough for ADA compliance, sufficiently low for natural seating, or halfway between for a blend of comfort. 

It is made from vitreous china material and features the EverClean protective coating. With a 15.88 inches height and 50 pounds in weight, setting up this toilet might be more than a one-person job. However, once you overcome this task, it conveniently supports up to 1000 pounds.

The Afwall Flowise toilet has four mounting holes 7 ½ by 9-inch apart; and bolt holes, 9-inch center across and 7.5-inch center vertically. 

It uses the pressure-assisted siphonic jet system that works best with manual flushometer valves of 1.1/1.6GPF ratings. Thus, it makes CALGreen, WaterSense, and HET standards. 

This American Standard toilet comes with a 1.5-inch top inlet spud and a condensation channel. It works best in buildings with water pressures between 25 and 80psi and has a 12-inch rough-in attachment for standard fitting. 

But since it is not packed with a gasket, a seat, a flushometer valve, or other installation hardware, it’s not a straight-out-of-the-box installation – unless you have all these ready.  

As with all dual flush 1.1/1.6GPF toilets, the Afwall Millennium Flowise lets you save 31% more water and a possible cost fraction on your water bill than standard 1.6GPF models.

Color Choice:

• White

The American Standard Madera 3461 takes us back to floor-mounted, elongated tankless toilets.

Crafted from vitreous china and glossed with the proprietary EverClean protective glaze, the 3461 is durable and easy to maintain. 

This tankless toilet measures 16.5 from its base to its rim for a blend of comfort and weighs 52.99 pounds. It uses the pressure-assisted flush mechanism to support its manual flushometer valve requirement of 1.1/1.6GPF. 

Pressure-assisted systems are known for two things: their power and their noise. But it appears this toilet finds a way around it, as customers report its flush being pretty quiet. 

The American Standard Madera 3461 enhances its flush and sanitary quality with its 10 by 12-inch water surface area, a condensation channel, a 2 ⅛-inch fully-glazed trapway, and a 10 to 12-inch rough-in fitting, which fits most bathrooms. 

It comes packed with the 1.5-inch top inlet spud for flush valve placement and the installation bolts. 

Like most on this list, the Madera 3461 works best in buildings with water pressure levels between 25 and 80psi and makes CALGreen, WaterSense® and HET certifications. 

Still, it’s such a bummer that the Madera 3461 does not come with a flushometer or a seat. However, many customers still love it, as there are tons of sterling ratings and positive comments on its functionality and design. 

So, if this toilet appeals to you and you are on the lookout for a toilet seat to match this bowl, don’t settle. 

Color Choice:

• White

Some reviews dub this piece “the toilet that can stand the test of time.” So let’s see if it indeed has what it takes. 

Like our other best tankless toilets, the Madera 2857 is a floor-mounted, elongated tankless toilet with a minimalist design to suit any bathroom. It is made from vitreous china material and uses the trio-set-up: pressure-assisted flush, manual flushometer valve and dual-flush system of 1.1/1.6GPF. 

This Madera tankless toilet is coated with a protective glaze, making it more low maintenance. And unlike the others, it has a rim height of 16.5-inch, 0.5 inches shorter than ADA minimum standards. As a result, it is more accommodating for more individuals, including persons in wheelchairs. 

Similar to the 3451 and 2234, the Madera 2857 is CALGreen, WaterSense, and HET certified. It has a water surface area of 10 by 12-inch and a 2 ⅛-inch fully-glazed trapway for excellent flush performance. It also has a condensation channel for moisture control and comes with a 1.5-inch top inlet spud. 

Because of its high-pressure system, this tankless toilet works best in buildings with water pressure between 25 and 80psi and requires a broad water line to deliver this need. The Madera 2857 has a flexible attachment that accommodates 10 to 12-inch rough-in sizes. 

Most customers love this tankless toilet because it comes with a manual flushometer valve, two bolt caps, and other installation hardware. 

However, it is on the long list of modern toilets that do not come with a seat. If you enjoy customizing your space, this is a time to hone your creativity. 

Finally, you should know: Some customers claim the flush system does not work as expected. While others say, it works just fine. An installation issue? Maybe.

Color Choice:

• White

This tankless toilet claims to outshine its predecessors in efficiency, water use and comfort. But we’d have to check out its features to verify its claim.

Like our other best tankless toilets, the Madera 2858 is a floor-mounted, elongated piece. Elongated toilets are known for their comfort, so that’s a plus. It is made from the easy-clean, low-maintenance vitreous china material.

With a rim height of about 15-inches from the floor, this tankless toilet is comfortable for most children but lacks ADA compliance. While its pressure-assisted flush system supports its dual-flush manual flushometer valve so that it makes WaterSense, CALGreen, and HET certifications. 

As a pressure-assisted system, the Madera 2858 toilet relies largely on water pressure. Thus, it needs a 1-inch wide supply line, has a 10 by 12-inch water surface area and features a fully glazed 2 ⅛-inch trapway. Since its maximum pressure allowance is 80psi, you should buy a pressure regulator if your home pressure exceeds 80 PSI.

The Madera 2858 comes with a 1.5-inch top inlet spud, a manual flushometer valve and two bolts, but not a seat. It features a condensation channel for moisture control and chloramine-resistant EPDM seals for extra leak-proof performance. 

Because this tankless toilet is compatible with 10 or 12-inch rough-ins, it pretty much fits all standard bathrooms’ configurations. It also suits all standard elongated toilet seats and allows customers to explore the different models on the market. 

Several customers have shared impressive reviews on this toilet. But there are a few mentions of multiple flushes required after use.

Color Choice:

• White

The American Standard is pretty impressive with its tankless toilet pieces, but it isn’t the only brand making waves. TOTO is another industry leader in green technology, and the TOTO CT705UNG#01 is one of its best tankless toilets. 

Modern themes are the new fad, and if you need trendy and simple, the TOTO CT705UNG#01 toilet might fit your style. This tankless toilet is made from cotton-finished vitreous china and has the brand’s proprietary CeFiONtecT/Sanagloss glaze. 

If, for some reason, you’d rather have the toilet without the glaze, it is also available in the non-glazed design: the CT705UN commercial floor-mounted toilet.

These models measure 15-inches from the base to their rim and use a pressure-assisted system designed to support whatever eco-flush valves they are fitted with. Due to its broad compatibility, you can transform your toilet into a dual-flush system of either 1.6/1.1GPF or one of 1.28/1.0GPF.

As a result, the tankless toilet is both HET and WaterSense certified. Surprisingly, several customers compliment its relatively quiet flush, an essential factor of compact toilets for tiny homes. And to enhance its flush system, it has a 10 ¾ by 9 ¼-inches water surface area. 

The TOTO CT705UNG#01 is about 50 pounds heavy, and because it is compatible with rough-in sizes from 10 to 12-inches, it is suitable for standard and small-sized bathrooms. However, it has a smaller-sized trapway of 1.875, which is most likely the reason for its even higher minimum pressure need of 35psi.

Like most on this list, the TOTO CT705UNG#01 is packed with only the 1.5-inch top inlet spud and bolt caps. The seat and desired flush valve will require separate purchases. You might also have to upgrade the wax ring to a higher-quality type for better leak-free performance.

Color Choice:

• Cotton

The Sloan 2102009 toilet also lets its customers use not just one but several flushometer valve types. You are not limited to the manual flush valves with this tankless toilet. 

Fun fact:

History says that the flushometer is a creation of the Sloan brand, invented by William Elvis Sloan. 

The Sloan 2102009 is a floor-mounted, elongated bowl that measures about 27 ¾-inch front-to-wall toilet and has a rim height of 15-inches. It weighs about 46.9 pounds, which makes it relatively easy to install and re-adjust. 

Please note: Some specifications on e-commerce stores denote a 25-inch front-to-wall measurement, but the length indicated in this description is verified from several customer feedbacks for accuracy.

Because this tankless toilet is compatible with most flush valves, you can combine its pressure-assisted flush system with a dual-flush valve of 1.6/1.1GPF or 1.28/1.0GPF. 

This Sloan toilet is made from vitreous china material and is fitted with a 2 ⅛-inch fully glazed trapway for excellent flush performance. It features a water surface area of 10.12 by 9.37-inch and comes with a 1.5-inch top inlet spud but not a seat or flush valve.

The Sloan 2102009 toilet makes WaterSense and HET standards and works best in buildings with water pressure levels between 25psi and 80psi. It offers flexibility with rough-in sizes as it is compatible with 10 and 12-inch lengths. 

Although its lack of a seat means extra cost, you can get some of the best quality seats, guaranteed to last you for years, with the right guide and at the best price.

Color Choice:

• White

We certainly cannot end this review without including a Kohler tankless toilet. The Kohler brand is renowned in the industry for its all-faceted top-quality. So, from its many designs, we have made the Kohler Wellcomme Ultra our best Kohler tankless toilet.

The Wellcomme Ultra is a line of flushometer valve toilets invented by the Kohler brand to replace their Wellcomme and Wellworth flushometer categories.

Although it has the same elongated, floor-mounted design with vitreous china of most tankless toilets, the Kohler Wellcomme Ultra uses the antimicrobial finish Kohler K96053-SS and features the multi-versatile pressure-assisted flush. It has been tested and certified as a HET to this effect.

The Wellcomme Ultra toilet is about 15.18 inches tall and weighs around 48.7 pounds, which means less trouble setting it up. It also has a 10-inch rough-in fitting to ensure it doesn’t take up any more floor space than it already has.

After reviewing the TOTO 35psi minimum pressure requirement, we can be thankful for this toilet’s now-relatively low pressure and flow rating of 25psi and 19gpm. It has a 2 ⅛-inch trapway and a 10 by 7-inch wide water surface to further enhance its flush performance.

The Wellcomme Ultra toilet is packed with a 1.5-inch top inlet spud and the bolt cap accessory pack but lets customers fit in their favorite elongated-front toilet seats and flushometer valves. 

Tired of the standard white-colored toilets? The Kohler Wellcomme Ultra is available in three other hues: biscuit, almond, and black.

Color Choices:

• White (0)
• Biscuit (96)
• Black Black (7)