Toiletsguide is audience-supported. When you buy through links on this site, we may earn an affiliate commission that we use for site maintenance. Learn more


Best Tankless Toilets for Small Bathrooms: Maximizing Space and Comfort

Tankless toilets are so popular today because of their compact, fashionable, and high-tech design. As the name implies, tankless toilets come without a tank. Unlike regular ones that have water in the tanks, no-tank toilets connect directly to the water supply pipes. They use small electric pumps to draw water from the pipes into the bowl.

Their most significant advantage is that they create more space in the bathroom to accommodate other fixtures like tables, shelves, and cabinets. Since they have no tanks, you can install them at any location in the house provided there is a suitable plumbing connection.

If you’re in search of the best tankless toilets out there, we’re here to help with a complete buying guide. We also spent weeks checking some of the top models out there. Go through our findings and make an informed buying decision.

7 Best Tankless Toilets for Residential Use Reviewed

1 Saniflo 023 Sanicompact Self-Containment Toilet

Saniflo 023 Sanicompact Self-Containment Toilet

When you are looking for a self-contained but high-performance unit, the Saniflo 023 has got you covered. The first thing you will appreciate about this model is its unique water conservation technology. This flushing toilet is highly efficient and uses only a gallon of water per flush. The flushing mechanism has an electronic timer that regulates the rate of flow.

Most notably, the Saniflo 023 has a built-in pump that is concealed under the base of the bowl, which is responsible for its efficient waste evacuation. The macerator evacuates the waste up to the discharge line with enough power. In addition to its excellent space saver design, the macerator makes this unit most suitable for remote locations like the basement, garage, and even under the stairs.

You will also like the materials used in this unit, which is the reason for its durability and ease of maintenance. Not only that, but it also comes in a comfortable height that makes it easily accessible for physically challenged people. It’s overall build quality and performance were impressive for us, so you can be sure it will live up to your expectations.

There is a non-return valve on the discharge elbow that prevents water from re-entering the unit. Besides, you have the option to link this unit to another toilet or sink, and this comes handy when you do not want to create separate drainages.

Fortunately, this Sanoniflo 023 model comes with a dual flushing mechanism that allows you to easily select your ideal flushing mode. However, to ensure it remains clean and does not frequently clog, avoid putting wipes into the bowl.

It is the most affordable option on this list and comes with a two-year warranty, which you can raise to three after registering your purchase. Looking at its high ratings and the many positive comments from users on eStores like Amazon, there is no doubt other users also enjoyed its high function ality. Although the installation manual was a little difficult to understand, YouTube videos came to the rescue!


  • Dimensions: 18.2 x 14.5 x 15.8 inches
  • Weight: 62.2 pounds
  • Color: White
  • Material: Porcelain
  • Shape: Elongated
  • Flush Type: Gravity
  • Water Consumption: 1.6 GPF
  • Warranty: 2 years


  • Affordable
  • Easy to connect with sink
  • Compact and stylish design
  • Ideal for fitting in tight spots
  • Excellent water conservation
  • Eco-friendly
  • Electronically regulated flow


  • Inadequate installation information

Our Verdict

Overall, the Saniflo 023 is pretty cost-effective and has the necessary specs we need. It looks beautiful, excellent quality, and performance. It does not have a tank, which makes it look smaller, but it sits like a standard toilet. The pump was hidden in the unit, and we were quite happy with its fit and finish. The only issue was installation instructions, but we were fulfilled with the purchase after getting a hank over it.

This is the best tankless toilet for homeowners who are looking for a dependable, space-saving, and budget-friendly option.

2 Toto MS992CUMFG#01 Neorest

Toto MS992CUMFG#01 Neorest

Toto is reputable for its brilliant solutions for your basic bathroom needs. The Neorest tankless toilet is optimized to provide luxury and comfort for everyone irrespective of age or physical ability. It is built with the best quality materials and technology to ensure durability and function ality.

It has a seat height of 20 inches, which is much higher than regular toilets, making it easier to sit or stand, and as such, it is an ideal choice for people with mobility issues.

It comes with a remote control that lets you customize the water temperature and flushing mechanism. The handheld device features images to help you understand the function s at a glimpse.

That’s not all; this model has a motion sensor that automatically turns the light on and opens the toilet’s lid once you approach and closes when you leave the seat. Just before you sit, a spray of electrolyzed water covers the bowl to keep it fresh and clean. Besides, it has a Sana gloss surface that prevents the sticking of dirt, reducing the time you spend to clean.

Everything about this item is amazing, especially the night light that makes navigation easier and the preheated seat to warm your butt. Once you sit, a sensor under the seat starts the exhaust fan to remove any foul smell. With a press of a button on the remote, the toilet gives you a thorough cleansing and spa-like experience by squirting pressured water. It also sends out warm air to dry you.

You can press a button to make it flush or get up for it to clean itself automatically. Fortunately, it has a memory to retain the settings for up to two users. It is also an ADA compliant toilet making it accessible for disabled people.

The Neorest toilet is designed for better utilization of water as it uses only one gallon per flush. Its price is on the high side when compared with our first pick, but that is a good deal for us considering its features and performance.

Our only concern is its auto flush time is shorter than auto close time, meaning the lid stays open while flushing the toilet.


  • Dimensions: 32.5 x 15.5 x 21.5 inches
  • Color: Cotton White
  • Shape: Oval
  • Style: Contemporary
  • Flush Type: Siphon Jet
  • Certification: Watersense
  • Water Consumption: 1 GPF
  • Material: Ceramic with Sanagloss
  • Voltage: 120V
  • Power: 1413W
  • Warranty: 3 years


  • Innovative features
  • Gentle nightlight
  • Auto flush technology
  • Customizable settings
  • Auto open and close lid
  • Remote controller
  • Dual flush mechanism


  • Lid is open during the flush

Our Verdict

This tankless toilet takes the lead in its category. Though it comes at a price, it offers a lot more by features and performance. It is ADA compliant and provides a hands-free automatic flush for your convenience and hygiene. On top of that, it’s a dual flush toilet, so you get to choose how much water you want to spend. No wonder why it’s one of the best-rated models on our list. We would like to recommend it to anyone looking for a model that would enhance their overall toilet experience.

3 Toto MS920CEMFG#01

Toto MS920CEMFG#01

The MS920CEMFG#01 is another advanced option from TOTO that is suitable for everyone. Compared to our previous choice, this item is much cheaper but lacks the night light feature.

It is equipped with many smart features to attend to your hygiene and comfort. It has fully automatic function s that you can modify to suit your preference.

The seat closes and opens by itself. After you’re done, a wand pops to perfect the cleaning for you. The best part is you can choose your ideal washing position and water pressure. However, the auto drying session takes a little time, so you must be patient or opt for a tissue paper.

What’s more, you will feel the warmth of the heated seat once you sit, and you can easily select the temperature levels. You may also save your preferred setting with the two-user memory feature. It uses less water, and the CEFIONTECT finish makes it free from sticky stains.

On the negative, there was no way to adjust the sensitivity of the lid as it opened whenever someone walked into the bathroom. However, we fell in love with its performance such that other regular toilets seemed primitive to us.


  • Weight: 102 pounds
  • Dimensions: 28.6 x 11.6 x 26.9 inches
  • Material: Ceramic
  • Color: Cotton White
  • Size: Large – LTL
  • Power Source: Corded-electric
  • Water consumption: 1.28 GPF


  • Automatic deodorizer
  • Universal height
  • Cefiontect ceramic surfaces
  • 3D tornado flush
  • Auto dryer
  • Heated seat
  • Auto open and close lid
  • Self-cleaning wand
  • ADA-compliant


  • Dryer takes time
  • Inability to control the lid’s sensitivity

Our Verdict

This unit offers many great features for any user. It looks beautiful and performs well. Most importantly, it is water efficient which is beneficial to the environment as freshwater reserve is decreasing globally. Its price is pretty reasonable considering the features you get. If you are looking for an affordable and feature-rich tankless toilet, this one is your perfect choice.

4 TOTO MS982CUMG#01 Neorest 550H

TOTO MS982CUMG#01 Neorest 550H

The TOTO Neorest 550H offers you the best blend of function ality, luxury, and comfort. It features the patented SanaGloss ceramic glaze, meaning you will not need harsh chemicals to maintain its clean look. Interestingly, pre-mist wet the surface of the bowl to aid the removal of waste. After each flush, an electrolyzed water covers the bowl to reduce disease-causing germs and the accumulation of dirt.

The Neorest 550H has three adjustable cleaning function s, which are rear, front, and soft. The front wash consists of large, soft drops for comfortable and intimate cleansing. The soft spray uses less water pressure but covers a greater space while the rear mode features a stronger but pleasant flow.

It utilizes the cyclone siphon jet, which guarantees top-notch economical flushing. This technology delivers cleaner flush yet can only use 0.8 to 1 GPF. You will enjoy the preheated seat, auto flush, auto opening and closing, handheld controller, a nightlight, and much more.


  • Dimensions: 27.8 x 15.3 x 21.5 inches
  • Weight: 86 pounds
  • Color: White
  • Shape: Elongated
  • Power Source: Corded-electric
  • Voltage: 120V
  • Wattage: 1413W
  • Water Consumption: 1 GPF
  • Certification: WaterSense


  • Cyclone flushing system
  • Pre-wetting of the toilet bowl
  • Disinfection mist after each flush
  • Easy to maintain
  • Three cleaning modes
  • Automatic flush
  • Easy to read remote control
  • Sanagloss ceramic glaze


  • Relatively expensive

Our Verdict

This is an advanced unit with excellent programmability, and so it is worth the huge price. It operates flawlessly, having a SanaGloss finish, such that it is easy to clean and will maintain its original color for years.

The Neorest 550H had a much higher rating than any other model on this list, which meant many users were happy with the purchase. Installation was pretty easy, and the remote controller worked as advertised.

Overall, this is a significant investment, and if you do not have issues with the price point, this can be the perfect option for your home.

5 Ove Decors Tuva Tankless Eco Smart Toilet

Ove Decors Tuva Tankless Eco Smart Toilet

The Ove Tuva tankless toilet has many impressive specs to take your restroom experience to a higher level. It combines the features of an old fashioned traditional toilet and a smart toilet, making it the most efficient model available at this price category. There is a flush button on the side that allows you to flush whenever the power goes off manually. Besides, it has a battery slot; and as such, you can use it without the main power source.

The Ove Tuva model comes with a bidet and sprays nozzle wash that wipes you clean, eliminating the need for toilet paper. It comes with a LED that brightens the room in the night. Besides, it has eight levels of water pressure, four modes of water temperature, and four levels of seat heat. Using it was quite easy for us because of its user-friendly settings.

It is an eco-friendly one piece toilet that complies with EPA flushing guidelines and Watersense requirements. Such that it saves a lot more water than standard toilets and could clean the bowl perfectly with a single flush.

It features an elongated bowl for better comfort when sitting, and a soft close seat to prevent slamming. Besides, it will flush whenever you depart, providing a hands-free, convenient, and hygienic operation.

We were not happy with its installation manual; the instructions were challenging to understand.


  • Weight: 88 pounds
  • Dimensions: 27.2 x 16.1 x 20.5 inches
  • Color: White
  • Material: Ceramic
  • Shape: Elongated
  • Installation Method: Floor
  • Flow rate: 1.28 GPF


  • Manual and automatic flush system
  • Effective cleaning
  • LED night light
  • Energy efficient
  • User-friendly
  • Heated seat
  • Remote control function s
  • Soft close seat
  • Adjustable temperature and pressure


  • Unreliable installation manual

Our Verdict

This unit offers a wide range of features, the top one being its combination of auto and manual flush mechanisms. It has built-in heaters for water and air, even as you can easily adjust the water temperature and pressure. So you need to spend a little time to figure out your ideal setting. The price is quite reasonable, bearing in mind its high-tech specs and build-quality.

It was one of the most highly rated tankless toilets on our list, and we could guarantee it will be a great choice for your home.

6 Bio Bidet IB835 Fully Integrated Bidet Toilet System

Bio Bidet IB835 Fully Integrated Bidet Toilet System

The IB835 tankless toilet is one of the best models that you can ever find on the market today. You will appreciate its classy and sleek design that makes the unit an excellent addition to your bathroom. It is a combination of a toilet and bidet; hence you will enjoy a fully automated experience. It has a sensor that quickly activates the function s per your body movements.

This model has an auto flushing system that helps you dispose of the waste. There is a flush button for those of us who would prefer doing it manually. It has two nozzles that provide different washing systems for both men and women. The water and the seat feel warm, which is quite awesome when it is cold.

The integrated remote allows you to have full control of the function s, and with the LCD window, you can see your settings. Luckily, there is a deodorizer to refresh the air around and a blower to make you dry when you are done. However, bear in mind that the auto dryer takes a few minutes to finish the job.

Compared to our previous choice, the IB835 was pretty easy to install, and the step by step guide on its manual was quite helpful. However, a few reviewers complained the toilet does not flush completely, but that should not make you doubt its dependability since there is a way to fix such issues.


  • Dimensions: 27.7 x 15.8 x 21.1 inches
  • Weight: 40 pounds
  • Maximum Weight Capacity: 330 pounds
  • Installation Method: Floor-mounted
  • Flush Type: Auto
  • Color: White
  • Shape: Elongated
  • Material: Vitreous China
  • Power Source: AC
  • Voltage: 110V
  • Wattage: 1250W
  • Warranty: 3 years


  • Auto open and close seat lid
  • Warm seat
  • Adjustable temperature and pressure
  • Compact and classy design
  • Simplified installation instructions
  • Smart remote controller
  • Unisex nozzle system
  • Trouble-free operation
  • Eco-friendly and energy saving


  • Expensive
  • Reports of incomplete flush

Our Verdict

This is a brilliant tankless toilet with many exciting features, but the price is also on the higher end. However, it is still a great purchase for those looking for a reliable and feature-packed unit.

7 KOHLER K-6303-0 Veil Elongated Dual-Flush Wall-Hung Toilet

KOHLER K-6303-0 Veil Elongated Dual-Flush Wall-Hung Toilet

The KOHLER K-6303-0 is another sleek and stylish tankless toilet that we found worthy of this list. It has an elongated shape, such that it occupies minimum space while facilitating easy and comfortable seating, making it the perfect option for any modern bathroom. It comes with a dual flushing system, offering you the choice of either 0.8 or 1.6 gallons per flush.

It is wall-mounted, and as such, you can easily pick your perfect height from the floor. Besides, the K-6303-0 has a patented Q3 seat feature that enables you to change the seat position depending on your height quickly. The installation hardware of this unit is completely hidden, making it easier to clean while giving your restroom a beautiful appeal.

We noticed a few complaints about the comfort level and durability of the seat. Besides, some people did not like the fact that one must hold down the flush button to drain the waste completely.


  • Weight: 50 pounds
  • 26 x 18.8 x 46.6 inches
  • Color: White
  • Shape: Elongated
  • Installation Method: Wall
  • Water Consumption: 1.6 GPF
  • Flush Type: Dual Flush
  • Certification: Watersense


  • Dual flush technology
  • Easy to clean
  • Compact design
  • Adjustable bowl’s height
  • Water-efficient
  • Affordable
  • Concealed installation hardware


  • Issues with flushing
  • Cheap plastic seat

Our Verdict

The K-6303-0 one-piece tankless toilet is unique as it enables you to pick your preferred bowl’s height easily. The stylish Western design is available in white, black, dune, almond, and biscuit colors. Though it might not be the best model out there looking at its specs, it is another great budget-friendly tankless toilet for home use.

Tankless Toilets Buying Guide: How to Find the Best Tankless Toilets

Tankless Toilets Buying Guide

So what do I need to know to detect the best tankless toilet for my bathroom? To answer this question, we’ve come up with the following section. Please read carefully.

1. Quality

You should not pay for any product without taking the time to check its build-quality. This is because the quality will affect the durability and performance of the toilet. So, we recommend you find a model with the best quality though it might come at a price.

2. Power Supply

You need a power supply to initiate the flushing mechanism in a tankless toilet like you do for an upflush toilet. If we had a section titled: ‘Tankless Toilet vs Tank Toilet’, we’d put this difference on the top. In terms of power supply, if you do not have a regular one in your home, you should avoid buying an electrically operated tankless toilet. However, some models use a battery and can flush when there is a power outage manually.

3. Type

Tankless toilets are either floor-mounted or wall-mounted. You should consider the toilet’s design and your wall’s ability to support its weight before choosing any of these types.

  • Floor-mounted – If you have adequate bathroom space, you can select a floor mount model. It is fixed to the floor, making it easier to install than the wall hung types. However, once it is installed, you cannot easily adjust its height.
  • Wall-mounted –These toilets are installed to hang on the walls of the bathroom. They are ideal for homes with limited space. Notably, they have a sleek design and are easy to clean.

4. Space

The fact that these toilets are without tanks means you can install them in tight places. These tankless models are ideal for small bathrooms. However, they also come in different sizes and shapes, so take your time to compare them, then pick a model that will fit in your bathroom’s space.

5. Flushing Mechanism

You should be mindful that the toilet’s flushing system is powerful enough to clear the solid waste in a single flush. Some models might look appealing but will take around three to four times of flush; as a rule of thumb, avoid them. Of course, everyone wants a unit that works as good as it looks. Sometimes, you might encounter issues with flushing. If it doesn’t work, you always have the manual option. If you want to know how to flush a tankless toilet without water, just get a bucket full of water and empty it in the commode. There you go. The wastewater will vanish in a few seconds. That’s the easiest solution before you call a professional.

6. Water Consumption

If you want to save money on energy bills, then it is crucial to select a unit with high water savings. Pick a quality flush valve in that case. Be sure to get a model that conserves water but also has enough pressure to remove the waste quickly. If you have a slow filling valve for regular toilets, there are easy ways to fix it. However, in this case, you need a certified plumber to do that for you.

7. Seat Height

Different tankless commodes have heights ranging from 15 to 20 inches. If you are sharing the bathroom with others, especially with people with mobility issues, you should consider buying the comfort height types.

8. Bowl Shape

Tankless toilet shapes are categorized into three, namely, round, elongated, and compact elongated types.

  • Round shape – No-tank toilets with round shapes have a bowl’s measurement of up to 28 to 31 inches. They are known to save more space but not quite comfortable to use.
  • Elongated shape – These are suitable for people of all ages and offer the highest comfort. The bowl is between 28 to 31-5/8 inches, measured from the nose to the back.
  • Compact elongated shape –As the name implies, this toilet has a much smaller size, but with the elongated shape, you will have great comfort. It is suitable for small space bathrooms.

9. Comfort

You should choose a water closet (WC) that will offer you the best in terms of comfort. Before picking your ideal model, try to compare the various features of the units to determine the level of relaxation they can offer. A few of the specs to look out for include heated seats, auto open and close lid, warm water, comfortable height, night light, self-cleaning, and much more. The models we’ve mentioned in our tankless toilet reviews would meet this

10. Ease of maintenance

Most no-tank toilets are more accessible to clean than others, depending on their shape, design, and finish. Unlike the no septic composting models (also known as a plumbingless toilet), these are easier to clean. Besides, Sanagloss finish prevents the sticking of dirt on the bowl’s surface, reducing the rate of cleaning and restricts the use of harsh chemicals.

11. Advanced features

Mostly, the price tag on the toilet will determine the number of extras you will get. In other words, a unit with an auto flushing mechanism, remote controller, and heated seat will cost more. A feature like a night light, automatic open and close lids, auto flushing, etc., are pretty essential for homes with kids and physically challenged persons.

No-Tank Toilets – Pros & Cons

If you are considering investing in any of our listed items, we believe that their benefits and drawbacks below put you on the right track.


  • Tankless wall drain toilets are smaller than regular types yet still perform flawlessly.
  • Mostly, they do not require a pump; however, they produce a more powerful flush.
  • They use minimum volumes of water.
  • The tankless flushing system works fast because they take less time to refill. This comes handy when people queue to use the facility.
  • In tankless toilets, the supply pipe is in the wall, making it less prone to leakage.
  • It’s available in all corners of the world.
  • Tankless toilets are easier to clean and maintain.
  • They are stylish and have more design flexibility.
  • You have more space to install a shelf over the toilet.


  • Most of them depend on power to function , so it can only flush when there is power.
  • The installation is complicated and requires the services of a licensed technician.
  • Tankless toilets are quite expensive.
  • Homes with low water pressure will experience flushing issues.

Tankless Toilet Installation Tips

Ready to install a tankless toilet? Whether you are making a replacement or installing a commercial tankless toilet for the first time, these tips will help you do it right.

  • Check if the drainage system in the house will support your new lavatory. Ensure that the pipes in your building can withstand the toilet’s water pressure. For the best performance and reliability, you need to install at least a 1-inch pipe.
  • Damages may occur with the pipes whenever you are replacing a tank toilet with a tankless type, which might cause you to overhaul the plumbing installation.
  • For toilet replacements, you need to inspect the flange for damage. Where the flange is damaged or cracked, you should replace or repair it.
  • Make sure that you set the closet bolts upright within collar slots of the flange before placing a brass washer around each peg.
  • Check the wax ring to determine if it is thick enough for the toilet to rest on.
  • Line the bowl over the ring and bolts, but ensure it sits evenly on the floor. Then tighten the screws to secure the bowl.
  • After installing the seat, you can now link the toilet to the supply.
  • It is more cost-effective and efficient to install a tankless toilet in a new building and where you are guaranteed of adequate power supply.


Visiting the bathroom is something we do every day, but installing the best tankless toilet in your home will give you a life’s changing experience. While there are many options available on the market, be mindful of things you should consider to ensure you are making the right choice. Hopefully, these tankless toilet reviews will give you a good head start.

All the units we have listed are excellent in terms of quality, function ality, and performance. They are also user-friendly and use less water. If you are searching for a reliable and affordable model, we think our top pick; the Saniflo 023, is worth the purchase. It has an electronically controlled flushing mechanism, and you can link it with a bathroom sink.

As the most sophisticated model, the Bio Bidet IB835 tops the list. It is full of extra features that compensate for its expensive price. Overall, if you need to check out the best tankless toilets available today and select the perfect one for you, our today’s review will hopefully provide the necessary guidance.


1. How tankless toilets work?

Ans. They function through regulated flushing mechanisms that are connected to the main supply pipe.

2. Can I install these toilets in a skyscraper?

Ans. Yes. However, you should first check your supply water pressure. If the psi is low, you will need an external pump.

3. Right for your residential home?

Ans. Installing a tankless toilet in a residential home is a little complicated because such places have low pressure for the system to function correctly. You will need to install a pump, and that requires hiring an expert who might be expensive. To avoid all these, check your home’s psi and plumbing system before buying a no-tank toilet.

4. My toilet has auto flushing, what will happen in case of a power outage?

Ans. If your toilet can only function by electric power, it will automatically stop working once there is an outage. To avoid situations like this, we recommend you shop for models with a battery backup that could still flush when the main power supply is cut.

5. My water has low pressure. Can I use a tankless toilet?

Ans. Yes. But you experience some flushing issues if you do not install a pump.  

6. Do tankless toilets conserve water?

Ans. Yes. All the options we have listed are designed to save water.

7. How much does a tankless toilet cost?

Ans. The price is from $1000 to $5000. You will always get what you pay.

8. The tankless toilet won’t flush; what should I do?

Ans. This is as a result of a poorly seated flapper. Mostly, you need to replace the flapper or its connecting chain.

9. How to flush a tankless toilet without water?

Ans. You can only clean the toilet with a bucket of water by pouring at least a gallon into the bowl.

10. Tankless toilet keeps running, what should I do?

Ans. Some of the underlying causes of this are:

  • Displacement of the relief valve
  • Clogging of the bypass orifice
  • A damage or crack of the inside cover
  • Line pressure dropping too low

The remedy is to disassemble the affected parts and clean them thoroughly. Replace the inside cover and shut other controls to restore the water pressure.

About the author

Elizabeth Fincher

Elizabeth started her career as an interior design artist at a multinational interior design farm. She completed her masters degree from the University of North Texas back in 2010. She was also a Spelling Bee runner-up when she was 14. She took interest in bathroom interior designing after joining her first job. Later she started her own firm as an independent artist. She’s been one of the founding members of Toiletsguide. She examines the design and ergonomics of the units we review and directs the interior decoration team of our in-house research facility. Elizabeth plays piano masterfully and always finds time to entertain us in between our busy schedules.

Leave a Comment