Best Tankless Toilets 2021 – Reviews & Buying Guide

If you are looking for an economical and compact yet fashionable-looking toilet that doesn’t take up much space, the tankless toilet is one to install. These toilets make your bathroom feel very spacious, even in small bathrooms.

When you start remodeling your bathroom, consider getting a tankless toilet instead of a traditional one. This interesting invention certainly has a lot of advantages. The most important features of the tankless toilet are the waste disposal system and the unique flushing system.

Tankless toilet in bathroom

Most of the present tankless toilets on the market use the force of water to flush instead of a tank that stores water for flushing purposes. In high rises or when there is a low force of supply water, a pump is generally used to increase the force.

7 Best Tankless Toilets 2021 – Reviews

Bio Bidet IB835 Fully Integrated

Bio Bidet IB835 Fully Integrated Tankless Toilet

Comfort and convenience.

  • Oscillating wide clean and pulsating system with bubble infusion
  • The material helps it to stay clean for a long time
  • Temperature adjustable heated seat
  • Intelligent body sensor that responds to movement to turn the toilet on and off
  • Automatic open and closing seat lid
  • Continuous release of warm water while cleaning
  • Trouble-free operation
  • Dual nozzle provides two kinds of washing system for him and her
  • Compact and refined design

This is such a classy, sleek, and traditional-looking toilet that takes your bathroom visits to the next level. It is designed as a toilet and a bidet in one. It has a dual nozzle which provides two kinds of washes for him and her separately. The oscillating wide clean and pulsating technology cleans with warm water, which gives you a comfortable experience every time you use the Bio Bidet Toilet. This eco-friendly toilet has intelligent body sensor technology that turns on all the functions of the toilet and bidet when it senses any movement and turns off when you are done using it. It comes with 3 years of limited warranty.

Overall, this is a great bidet toilet for anyone who wants all the bells and whistles for comfort and cleaning.

Bio Bidet IB835 Fully Integrated

Saniflo 023 SANICOMPACT 48 Tankless Toilet

Environmentally conscious and compact.

  • Water can be pumped 9 feet vertically and 100 feet horizontally
  • Connects seamlessly to the sink
  • Stylish toilet seat includes chrome hinges
  • Affordable price
  • Perfect if building a half bathroom for residential applications
  • Uses 1 gallon per flush of water and saves energy

Previously, tankless toilets were restricted to only public facilities, but now these toilets are an essential part of daily life. This seamless, contemporary, tankless design is stylish and comfortable to use every day. They have chrome hinges and are compact as well, making them a great option for smaller bathrooms. These toilets are designed for residential homes and for those who’d love to create a convenient bathroom setting. An aspect that is perhaps especially appealing to the environmentally-friendly crowd is that the toilet uses only one gallon per flush.

Bio Bidet IB835 Fully Integrated

Toto CT418FG 01 Tankless Toilet

Environmentally conscious and compact.

  • Automatic Tornado flushing system
  • Automatic opening and closing lid
  • Heated seat with temperature control
  • Air deodorizer
  • Universal Height of 19 inches
  • Uses 0.9 gallons of water per low gravity-flush
  • ADA and WaterSense compliant

This tankless toilet from TOTO utilizes advanced technology and an eco-friendly bidet Washlet. This is a remarkable combination of ecology and luxury. It fulfills all the universal design needs and is also suitable for people of all ages and abilities. Enjoy this innovation by using TOTO’s Tornado flushing system, eWater+ technology, remote control, and spray modes, which include ‘water spin’ and ‘wonder wave.’

It also has automatic flushing and a CEFIONTECT glaze, which ensures super smooth permanent glazing and keeps the toilet free from debris sticking around it — all while using less amount of water. It is an extraordinarily smooth ion barrier surface that helps to keep the toilet bowl clean for a long time.

Bio Bidet IB835 Fully Integrated

KOHLER K-5401-0 Veil Tankless Toilet

Minimal, yet luxurious.

  • Integrated stainless steel bidet
  • Dual flush technology with 0.8 or 1.28 gallons per flush
  • Adjustable warm air drying system
  • LED lights illuminate the bowl and serve as a nightlight
  • LCD remote with two programmable user presets
  • Quiet-Close seat
  • Motion-activated opening and closing lid
  • Compact design

This toilet has a beautiful curve that looks quite elegant. Kohler is one of the leaders of the industry, providing superior bathroom fixtures. This is a one-piece toilet that provides all the essential features you may want in your bathroom amenities. It has a self-cleaning and stainless steel bidet wand that uses an electrolyzed water system and sanitizes the wand and the surface. This leaves the toilet bowl clean and disinfected.

But that’s far from the only feature that this futuristic toilet has to offer. Employing a Quiet-Close seat and a nightlight, it’s truly a dream for a modern bathroom. As if that wasn’t enough, this is a bidet tankless toilet that’s also eco-friendly. It uses only 0.8 gallons per flush!

Bio Bidet IB835 Fully Integrated

Ove Decor Ecosmart Tankless Toilet

Minimal, yet luxurious.

  • Manual flush with adjustable features in the remote control
  • Bidet with a spray nozzle
  • Bidet dryer with adjustable temperature
  • Multifunctional remote control
  • It consumes 1.28 gallons of water per flush
  • Adjustable features include water pressure, water temperature, dryer temperature, and heated seat

Probably the smartest tankless toilet on our list. This ceramic beauty has a concealed trapway, a remote control, and is elongated for extra comfort. It will certainly change your bathroom experience for the better.

The Ecosmart has both automatic and manual flush functions and comes with a variety of features for you to adjust via the remote control. As if that wasn’t enough, this toilet has a bidet that can change the temperature of the water as well. It is a truly luxurious experience, yet it has no tank, full features, and is affordably priced.

Bio Bidet IB835 Fully Integrated

TOTO CT418F-01 Aquia Tankless Toilet

Best bang for your buck.

  • Affordable price
  • Easy to clean and convenient to use
  • Dual-Max flushing system
  • Universal Height of 19 inches
  • Can be paired with the TOTO in-wall tank system
  • Only uses 1.6 gallons of water per flush

If you are wanting a tankless toilet that has all the basic features and will stay in excellent working condition for a long time (without making you go bankrupt!), then this is the perfect toilet for you. This affordable system fits your wall, yet leaves plenty of space. It has a contemporary design that is both stylish and convenient.

The Aquia tankless toilet is a good fit for both classic and contemporary homes because of its well-thought-out design. Unlike many tankless toilets, it is easy to install and works quite well with the TOTO in-wall water supplies. The hidden hardware gives the toilet a seamless look. In the smallest room, it takes up the least room, making the space seem bigger.

Bio Bidet IB835 Fully Integrated

Dyconn Faucet Aqua Tankless Combo Toilet

Contemporary and pleasant.

  • Uses 1.8 gallons of water per flush
  • Soft-closing lid technology
  • Built-in LED light for nighttime guidance
  • Warm water cleaning bidet system
  • Smart sensor heated seat
  • Easy installation and seamless design
  • Replaceable dual wand nozzles
  • Built-in backup battery

Dyconn adds an element of convenience to the seamlessly contemporary décor of your bathroom. It gives your everyday visit to the bathroom a real charm. This one-piece toilet does not have a tank to worry about, and the process of installation is easy too, unlike many tankless toilets. It has both a toilet and a bidet system. It has added appeal with modern features.

Buying Guide

Power Supply

Take a look and see if you have a reliable supply of electricity, as the toilet can stop functioning without power. If your home or building has a common power outage problem, avoid this toilet unless you have a power backup generator.


If you are installing the toilet without a tank in place of your old toilet system, then leakages might become a problem at times.

If you are constructing a new home, check to see if the drainage system in the current building is supportive enough. Check to make sure that the pipes of your home or building can withstand the water pressure. The pipes should be at least 1 inch in size. They might be a little expensive, but they serve quite well in small bathrooms since they require very little maintenance support.

How Do Tankless Toilets Work?

When the user flushes a traditional toilet, the water is moved from the tank by gravity.

Traditional toilets need a tank to push the water quickly into the toilet bowl, allowing the water and everything else in the bowl to be pulled into the drain. Most water supply lines do not supply water fast enough to trigger this siphoning effect. The tank is an attempt to fix this problem. It holds water so that when you need to flush, there is a gallon or so of water standing by to be pushed into the toilet. Without the tank, the water would just dribble into the bowl and not produce an actual flush.

However, tankless toilets are a relatively new type of toilet that does not rely on a tank. Instead of needing to store water separately, they receive water directly from the supply line at tremendous pressure, allowing them to produce the flush effect. In most cases, this high pressure is achieved through the use of pumps or other additions. Some commercial buildings and apartment complexes have enough water pressure for you to skip out on this add-on, though.

Tankless toilets need a different approach to the flushing system. They do not store water anywhere, but rather they use the water in the pipes.

Tankless toilets work by using an electric pump to push the water through the toilet instead of relying on gravity. In other cases, the toilets use a special storage tank that supplies water to a whole building. Those pumpless flushing systems require pipes to work properly. The basic principle of this system is that it should create a violent flow that moves the solid waste out of the siphon system at the bottom.

Tankless Toilet Pros and Cons


  • They do not require extra pumps or other pieces of equipment.
  • They produce a more powerful flush than a tank toilet due to immense water pressure.
  • Their increased flushing power keeps your toilet cleaner for longer.
  • They fill up faster and can be flushed again sooner.
  • They take less space and have more design flexibility.
  • They use less water.
  • They are very useful for small modern bathrooms.
  • The pipes supplying water of a tankless toilet are mostly inserted under the floor or inside the wall.
  • They are a more environmentally friendly option because there are no water leakages.
  • They take less time to refill.
  • They are more sleek in the bathroom and are easy to clean.


  • They depend on power. If your power goes out, your toilet is not going to flush.
  • Repairs and installations are complex, requiring you to hire a professional plumber.
  • They are expensive, and only a few companies make them so far, including Kohler and TOTO.
  • They require a relatively wide supply pipeline in the house, which means you need to install a new pipeline, otherwise the high-pressure from the flush could damage your pipes.

Tankless Toilets: Right for Your Residental Home?

Putting a tankless toilet into a residential home is a little more complicated. Residential homes often do not have a high enough PSI (pounds per square inch) for tankless toilets to function without the use of an external pump. You will almost always have to install a pump or another piece of technology for a tankless toilet to flush properly. This can be expensive and will require an expert to install the system.

Sometimes you might need to upgrade your whole plumbing system, which can raise costs substantially. Because these factors depend on your particular house, you should check your PSI and make sure your plumbing meets the requirements of a tankless toilet before moving forward with buying one. 

If you have to install a pump, your tankless toilet will not work without power. If you live in an area that commonly experiences power outages, this type of toilet might not be for you. 

Tankless toilets work best in newer homes and for those with large budgets. If you’re a toilet enthusiast or you want your bathroom to have a certain design, a tankless toilet can be useful. They also work best for larger families or those who enjoy hosting large parties. These toilets also work well in smaller spaces.

Bathroom Modifications Needed with Tankless Toilets

Installing a tankless toilet might require absolutely no bathroom modifications. If your PSI (pounds per square inch) is high enough, you won’t need to add a pump or anything else. 

But, if your PSI is too low, you will have to install an extra pump. This pump can be installed into your wall, so you won’t see it. It will have to be installed by a professional, though. Your plumbing stacks might also need to be relocated if they are in the wrong location. Again, a professional plumber will need to do this.


Although there are so many great tankless toilets on the market according to our research, we think that the Bio Bidet IB835 is the top pick. If you are looking for something that would better fit a lower budget, you can go for the Toto CT418FG 01. Tankless toilets can be considered a blessing to innovation as they take up a minimum amount of space in your bathroom and come with lots of special features. Enjoy a new era of comfort with tankless toilet systems!