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Best Tankless Toilets of 2021

Updated
From the bathroom to the boat, we bring you 7 great tankless toilets.

Tankless toilets are space-saving, sleek, modern, and an excellent choice for compact bathrooms. You can get wall-hung versions where the tank is hidden in the wall, macerating options, and even RV toilets.

We review the best tankless toilets, rating them on price, functions, and quality to bring you our definitive list.

Our Top Picks

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Model
Product Comparison Table
Features

Product Image of the Thetford Porta Porti Qube 345 92813 Camping Toilet
Best Camping
Thetford Porta Potti Qube
  • Portable, take it on the go
  • Sealed 12L waste tank
  • Water-level indicator to avoid spills
Product Image of the Dometic 302320081 320 Series Standard Height RV Toilet, White
Best for RV
Dometic 320 Series RV Toilet
  • Made from ceramics
  • ADA Compliant
  • Pedal flush for easier flushing
Product Image of the WOODBRIDGE B-0960S Toilet, White
Best With Bidet
Woodbridge Smart Bidet Seat Toilet
  • Bidet feature
  • Heated seat
  • Automatic flush
Product Image of the Saniflo 023 Sanicompact Self-Contained Toilet
Best for Basements
Saniflo 023 Sanicompact Self-Contained Toilet
  • Macerating function
  • Uses only 1.5 gal per flush
  • ADA compliant
Product Image of the Toto MS920CEMFG#01 1.28-GPF/0.9-GPF Washlet with Integrated Toilet G400, Cotton White
Best for Small Bathrooms
Toto Washlet With Integrated Toilet
  • Auto-open & close seat
  • Low water use
  • Cefiontect coating
Product Image of the Jabsco 29090-5000 Twist n' Lock, Manual Marine Toilet, Compact Bowl
Best Marine Toilet
Jabsco Twist ‘n’ Lock Manual Marine Toilet
  • Powerful pump
  • Fraction of other model's cost
  • Corrosion resistance
Product Image of the Swiss Madison Well Made Forever Ivy SM-WT450 Wall Hung Toilet, Glossy White
Best Wall-Hung
Swiss Madison Well Made Forever Ivy SM-WT450
  • Modern styling
  • Great price for the look
  • Fix it to the wall at any height

How To Choose the Best Tankless Toilet

Choosing the best tankless toilet to match your needs sounds simple enough, but it can be confusing if you don’t know where to start. Here are some pointers on what to look for when shopping for your new tankless toilet.

Flushing Power

In many cases, your tankless toilet will have a smaller concealed tank, so does that mean a weaker flush? While you might get less “push,” you do get non-stick coatings and advances in technology that gives you more flushing power with less water.

Cyclonic and siphonic flushing systems utilize every last drop of water, while the shape of the bowl means the water reaches further. However, not all tankless toilets flush. Dry toilets rely on solid matter decomposing over time so that it can be scattered on your prize roses.

Eco-Friendly

Modern toilets use such a small amount of water that they are WaterSense rated by the Environment Protection Agency. Most use as little as 1.28 or 1.6 gallons, but some super-frugal toilets use just 0.8 gallons per flush.

Single vs. Dual Flush

Single flush toilets are more common than dual flush models. They typically flush 1.28 or 1.6 gallons of water every time you go to the toilet, regardless of whether it is liquid or solid. Single flush toilets may be slightly cheaper, but you do still waste some water.

Dual flush toilets give you the choice between a high setting for solid matter and a light flush for liquids. This is better because you don’t waste water.

Bowl Shape

The most popular shape of toilet on sale today is the elongated version. It means the bowl is slightly narrower compared to a round bowl, but they also protrude further from the wall. Elongated toilets are better for children, the elderly, those with mobility issues, and men who sit to pee.

Round bowls are still popular, but they are less comfortable. However, they take up less floor space, and they are marginally cheaper to buy.

Seat Height

You can get toilets in 3 heights: Standard, comfort, and universal.

Standard

Standard height toilets generally stand between 13 and 16 inches tall, with the most popular being 15.5 inches. While they are easier for children to sit on, they do make it more challenging for taller people and those with mobility issues, like the elderly and disabled.

Comfort

Comfort height seats comply with the Americans With Disabilities Act (ADA) because they measure a minimum of 17 inches (including the seat). The idea is that if the seat is higher, those less able can sit more comfortably and regain some of their independence by going to the toilet unaided.

Universal

Universal height seats also comply with the ADA regulations. However, while there is a minimum height, a universal toilet stretches that limit even further with 18, 19, and even 21-inch seat heights.

One-Piece vs. Two-Piece

One-piece toilets are generally more modern in style. They come as a complete unit, with the water tank and toilet bowl attached, so you don’t have to plumb in the tank before fitting the toilet.

The upside is they are easier to fit, take up less space, thanks to their styling, and there is less risk of leaks.

Two-piece toilets have the cistern and the toilet bowl separate. It means that before you install it, you need to attach the two to make a complete toilet. The upside is two-piece toilets are cheaper, and they typically have more traditional styling.

If you install the toilet on your own, it might be easier to fit a two-piece rather than a one-piece because it comes in separate parts, making it lighter.


The Best Tankless Toilets of 2021

Rather than just focus on tankless toilets for your home, we tried to think outside the box and imagine other locations where a tankless toilet would come in handy. So, we have included domestic, marine and even camping options to bring you our best 7 tankless toilets.

1. Thetford Porta Potti Qube Camping Toilet

Best Tankless Camping Toilet

Why should the advantages of a tankless toilet be exclusively for inside your home? With this portable toilet by Thetford, you can take some comforts to the campsite.

Okay, we’ll admit that while it doesn’t have a tank in the traditional sense, it has a small flushing reservoir, but because it is all self-contained, we felt it justified its place. So what has it got?

It has a 15-liter flush tank, a water-level indicator so you can judge when the tank is full, and a pouring spout to help you empty the contents. It has a lever pull at the front that opens the sealed flap to the waste tank, which holds 12 liters.

On the downside, considering this toilet is made from plastic, it is not a cheap option. We chose it because it is the best portable camping toilet, but that doesn’t mean there aren’t alternatives out there that deserve your attention.

Why We Love It

Portable

Having the ability to take this toilet with you on the go means you have some basic creature comforts to make your camping experience more manageable.

12-Liter Waste Tank

The tank holds a reasonable amount of waste material. It is sealed, so there are no bad odors, and when you empty it, it has a pouring spout to make life easier.

Water-Level Indicator

Knowing when the waste tank is full is crucial if you want to avoid spills and getting caught short. The water-level indicator tells you when you need to empty the tank.

Keep In Mind

Very Expensive

Essentially, this is a plastic travel toilet, so why is it so much more expensive than the competition? It is the best, but you have to question the price tag.

Additional Specs

Weight (pounds) 8.36
Dimensions (inches) 12.99 x 15.08 x 16.81
Type Portable
Price $$$$
Warranty 3-year

2. Dometic 320 Series RV Toilet

Best Tankless Toilet for RV

Much like camping, when you are out on the open road, having all the essential services inside your RV means you can live comfortably. This Dometic 320 Series is the best of the bunch and looks and feels like your toilet at home.

It is constructed from vitreous china, so it is robust, and it comes complete with the toilet seat. The bowl is elongated in shape, and the seat height measures 19.75 inches, so it more than complies with the ADA standards.

It has a spill-free rim for when you are on the road and a foot pedal that, when partially pressed, fills the toilet with water, and when fully depressed, it flushes. Because this toilet is made from ceramics, it weighs more than standard plastic models.

Why We Love It

Vitreous China

It’s rare to find an RV toilet that looks and feels like the toilet in your home. This one is made from ceramics, so everything about it feels like your standard toilet.

ADA Compliant

This RV toilet enables everyone, including elderly relatives and those less able, to use it without assistance.

Pedal Flush

Press the pedal lightly, and the toilet fills with water, and then press down hard, and it flushes. It makes the flushing process even easier.

Keep In Mind

Weighs 36 Pounds

Normally travel toilets are light, space-saving, and compact, and while this model hits two of those key criteria, it is heavy, weighing 36 pounds. When you compare that to the Thetford, it’s almost 30 pounds heavier.

Additional Specs

Weight (pounds) 36
Dimensions (inches) 22 x 14.75 x 19.75
Type RV
Price $$$
Warranty 2-year

3. Woodbridge Smart Bidet Seat Toilet

Best Tankless Toilet With Bidet

Having a tankless toilet with a bidet function is the ultimate in luxury. This Woodbridge has a self-activating seat, so when you stand after going to the toilet, it flushes automatically; plus, as you approach it, the lid lifts to greet you.

You get feminine and posterior hygiene, a carbon air filter that removes any lingering odors, and remote control so you can choose the correct settings. It even heats the seat and dries your backside.

It has an LED for nighttime visits when you don’t want to switch the light on, and the powerful yet quiet siphonic dual flush lets you choose between 1.6 and 1.0 gallons per flush.

If you want to own this toilet, you will need to start saving now because it costs over $1,000, so it won’t suit anyone looking for a budget option. It also weighs 114.8 pounds, so if you install this toilet on your own, you will struggle to lift it.

Why We Love It

Bidet Feature

Few things that match the hygiene levels of a bidet. You get a feminine wash, a posterior wash, and then it dries you, so no wiping is needed at all.

Heated Seat

What is more luxurious than a heated toilet seat? In the dead of winter, when the temperature plummets, your bottom will be toasty and warm.

Automatic Flush

As you approach the toilet, it lifts the seat, and as you stand, it flushes. You get 100 percent hands-free operation. What could be more hygienic than that?

Keep In Mind

Super-Expensive

While we recognize that you are getting a lot of product for your bucks, you still need to bear in mind the high costs of this toilet. This is definitely not a budget option.

Weighs 114.8 Pounds

With all those features and functions, is it any wonder this toilet weighs 114.8 pounds, which is over 3 times the weight of the Dometic model.

Additional Specs

Weight (pounds) 114.8
Dimensions (inches) 32 x 19 x 26
Type Bidet
Price $$$$$
Warranty 1-year limited

4. Saniflo 023 Sanicompact Self-Contained Toilet

Best Tankless Toilet for Basements

This Saniflo toilet is the ideal model if you plan on converting your basement to a usable room. Unlike gravity-fed toilets that rely on dropping your waste matter into the sewer from above, this system pumps the waste vertically up to 9 feet high.

It also allows you to connect the toilet to a sink to tap into the water supply, and it also uses just 1.5 gallons per flush. You can place this toilet almost anywhere because it pushes the waste along 120 feet of pipework to the soil stack.

The seat height measures 18.5 inches, which conforms to the ADA specifications, making it more comfortable for the less mobile. It is also a great choice when space is a premium.

However, the cost of this toilet is considerably higher than other comparable models. It almost gives the Woodbridge Bidet a run for its money. Plus, macerating toilets are notorious for malfunctioning and becoming blocked.

Why We Love It

Macerating Function

The macerator enables the toilet to break down the solid matter and pump it vertically to a height of 9 feet, making it the ideal product for basement conversions.

Low Water Use

If you want your next toilet to be frugal with water use, this model ticks that box. It only uses 1.5 gallons per flush.

ADA Compliant

When you have an elderly relative, a comfort height toilet seat helps them regain some independence. It makes getting on and off the toilet a lot easier.

Keep In Mind

Very Pricey

Saniflo toilets are not a budget option. They cost several times the price of similar models and almost as much as the Woodbridge bidet toilet.

Blocks Easily

Macerating toilets are well-known for their temperamentality. Too much toilet paper and they block. Too much solid matter and they block.

Additional Specs

Weight (pounds) 62.2
Dimensions (inches) 18.25 x 14.5 x 15.75
Type Macerating
Price $$$$$
Warranty 2-year

5. Toto Washlet With Integrated Toilet

Best Tankless Toilet for Small Bathrooms

If you have limited space like an en-suite, this Toto Washlet is a great choice, especially when you consider it has a bidet function as well. It also has a tornado flush, which removes the most stubborn waste material.

You get a Cefiontect coating that keeps the inside of the toilet bowl cleaner for longer, and you also get an automatic seat opener. Like the Woodbridge bidet option, you get a heated seat, a warm air dryer, and a deodorizer.

This is a universal height toilet, so it complies with the ADA specifications, and because it uses just 1.28 gallons of water per flush, it also complies with the WaterSense program.

However, we need to talk about the price. This model is double the cost of the Woodbridge, and we thought that one was expensive.

Why We Love It

Auto-Open and Close Seat

The seat opens and closes automatically, making it 100 percent hands-free. This is great for hygiene, and it also helps the little ones go to the toilet.

WaterSense Certified

Thanks to the low water use, this toilet has won accreditation from the Environment Protection Agency’s WaterSense program.

Cefiontect Coating

Cefiontect is an advanced toilet glaze that keeps the surface of the bowl slippery, which helps to flush solids away and reduces instances of adherence.

Keep In Mind

Very Overpriced

At almost double the price of the Woodbridge bidet toilet, this model is seriously overpriced compared to similar models.

Weights Over 100 Pounds

This Toto comes in at just over 100 pounds, making it the second heaviest to feature in the review.

Additional Specs

Weight (pounds) 102.01
Dimensions (inches) 28.62 x 15.37 x 26.93
Type Compact
Price $$$$$
Warranty 1-year limited

6. Jabsco Twist ‘n’ Lock Manual Marine Toilet

Best Tankless Marine Toilet

Okay, so we’ve covered your RV and your tent, but what about your boat? This Jabsco is the perfect marine toilet. It’s made from vitreous china and has corrosion-resistant parts to handle the harsh marine environment.

It comes in 4 varieties ranging from the compact bowl model to the one with a regular bowl and soft close seat. This is a twist and lock toilet, meaning that you have to pump the handle and then twist it 90 degrees, and the water flushes the waste away.

It can be fitted so the waste flushes overboard or to a holding tank, and it is reversible, so the pump can be mounted on either side. Another thing to love about this toilet is the price. It costs a fraction of the others featured.

Thanks to the corrosion-resistant materials, it can use salt and freshwater, plus the pump is so powerful, you can install it below the waterline.

The main disadvantage with this toilet is it is only suitable for boats, and because it is manually operated, you need to use a bit of elbow grease to get it to work.

Why We Love It

Powerful Pump

To operate this pump, you need to plunge the handle 3 or 4 times, and then when you feel it has pressurized, twist the handle 90 degrees, and the waste disappears.

Excellent Price

The fact that you can pick up one of these toilets for a fraction of the price of other models is a real bonus. Okay, so you would only ever use it in a boat, but it is still cheap.

Corrosion Resistance

All the materials are resistant to rust, which means you can use fresh or saltwater when flushing.

Keep In Mind

Only for Boats

If you don’t have a boat, this is not the toilet for you. It flushes directly overboard or into a holding tank.

Additional Specs

Weight (pounds) 24
Dimensions (inches) 20.98 x 20 x 17.99
Type Marine
Price $$
Warranty Not stated

7. Swiss Madison Well Made Forever Ivy SM-WT450 Wall Hung Toilet

Best Wall-Hung Tankless Toilet

We had to feature a wall-hung toilet. It’s a classic tankless style. This Swiss Madison is ultra-sleek, with cool lines and modern styling.

Plus, if you are looking for a toilet that uses the smallest amount of water, this model has a dual-flush facility, so it uses 0.8 gallons on the light setting and 1.28 gallons on the heavy flush. It is space-saving, has a soft-close seat with quick-release hinges, and is competitively priced.

It is a one-piece toilet constructed from porcelain, which is easy to clean and extremely robust. All the bolts and screws are supplied so you can mount this toilet. The only downside is you have to buy the tank separately, and fitting it is a challenge if you have limited building and plumbing skills.

However, because this is a wall-mounted toilet, you can choose the height you want the seat, so you could go for a standard seat height or please the elderly relatives and fit it at comfort height.

Why We Love It

Modern Styling

Few toilets look as good as this one. It has sleek styling with bold lines and curves, so if you have a modern bathroom, this will fit right in.

Excellent Price

When you look at this toilet, it feels and looks like it should be more expensive. We get that you have to buy the tank separately, but it is still a great price.

Bolts and Screws Provided

You get all the fixing you need to mount this on your wall. Plus, you can fix it to the wall at the height you want.

Keep In Mind

The Tank Is Separate

Once you purchase the toilet, you have to factor in the cost of the concealed water tank. So, while the purchase price is reasonable, the tank will cost you extra.

Difficult To Install

Fitting this toilet is a challenge if you have limited building and plumbing skills. You have to build a false wall to conceal the tank and then plumb it in.

Additional Specs

Weight (pounds) 48
Dimensions (inches) 20.68 x 14.75 x 13.37
Type Wall-hung
Price $$
Warranty 1-year limited

Tankless Toilet Comparison Chart

Product Best Weight Dimensions Type Price Warranty
Thetford Porta Potti Qube Best for Camping 8.36 lbs 12.99″ x 15.08″ x 16.81″ Portable $$$$ 3-year
Dometic 320 Series RV Toilet Best for RV 36 lbs 22″ x 14.75″ x 19.75″ RV $$$ 2-year
Woodbridge Smart Bidet Seat Toilet Best With Bidet 114.8 lbs 32″ x 19″ x 26″ Bidet $$$$$ 1-year limited
Saniflo 023 Sanicompact Self-Contained Toilet Best for Basements 62.2 lbs 18.25″ x 14.5″ x 15.75″ Macerating $$$$$ 2-year
Toto Washlet With Integrated Toilet Best for Small Bathrooms 102.01 lbs 28.62″ x 15.37″ x 26.93″ Compact $$$$$ 1-year limited
Jabsco Twist ‘n’ Lock Manual Marine Toilet Best Marine 24 lbs 20.98″ x 20″ x 17.99″ Marine $$ Not stated
Swiss Madison Well Made Forever Ivy SM-WT450 Best Wall-Hung 48 lbs 20.68″ x 14.75″ x 13.37″ Wall-hung $$ 1-year limited


Headshot of Mark Weir

About the Author

Mark Weir

Mark spent 24 years working in real estate, so he knows his way around a home. He also worked with contractors and experts, advising them on issues of planning, investments, and renovations. Mark is no stranger to hands-on experience, having renovated his own home and many properties for resale. He likes nothing better than seeing a project through to completion.