Best Pressure-Assisted Toilets: All You Need To Know

Best Pressure-Assisted Toilets: All You Need To Know

When you’re looking for a toilet, you want to pick the most efficient option on the market, right? A toilet that will deliver a powerful and effective flush every time and make you forget that your plunger even exists.

Well, in this case, a pressure-assisted toilet can be a good choice for you!

And you’re in the right place to choose one:

Below, you’ll find our thorough selection of the five best pressure-assist toilets and some useful tips to keep in mind because these toilets aren’t as simple as they seem to be.

So, get cozy and read on!

Quick Picks

Editor’s Choice

2nd Best Choice — ADA Compliant Pressure Assisted Toilet

3rd Best Choice — Dual Flush Pressure Assisted Toilet

American Standard 2876100.020 YorkvilleKohler K-3493-96 HighlineZurn Z5572 Dual Flush
  • operates within 25-80 psi range;
  • ultra-low consumption 1.1 GPF flush
  • Class Five ® flushing technology;
  • saves up to 2,000 gallons per year
  • high performance EcoFlush (1.0 GPF/ 1.6 GPF);
  • fully glazed trapway

How Does Pressure-Assisted Toilet Work?

So, the pressure-assisted toilet, or a power flush toilet, looks just like your regular commode, until you take a peek inside the tank.

In a regular gravity-fed toilet, you will see a pool of water and the flushing system that consists of the valve, the flapper, the trip lever chain, and the gasket.

However, if you look inside the pressure-assisted toilet, you will see another tank made of hard plastic. It is tightly sealed and connected to the water supply pipe. 

This inner tank contains a certain amount of air, and when the water fills the tank during the refill cycle, it compresses the air using merely water pressure in the pipes. 

When you trigger the flush, the compressed air blasts the water into the bowl at a much higher velocity than a standard gravity flush toilet. This process is similar to blowing the water through a straw, and the tank refills with the air as the water is ejected.

Then, during the next refill cycle, the fill valve opens and the process repeats.

Now, what are the advantages of this flushing technology?

Well, there are a few of them:

  • The flush is more efficient. Pressure assist toilets use 12-30% less water compared to gravity-fed systems (1) and can blast the water up to 50% farther into the bowl and ensure a more thorough bowl coverage. They also use less water and can have water consumption as low as 1.0 gallons per flush for solids.
  • The tank refills faster. The inner pressure tank has a smaller volume than the outer ceramic cistern and refills faster, which might be good for bulk waste removal.
  • Clog-free performance. A high-speed flush ensures more optimized waste passage through the trapway and can even break it down into smaller particles, which reduces the chances of blockage.
  • Works for homes with low water pressure. A gravity-assisted toilet might fail to flush the bulk waste within a single round if the pressure in the pipes is too low. The pressure-assisted unit addresses this problem by accumulating some pressure in the tank and using it for more efficient flushing.
  • Good for humid climates. The insulated inner tank has another advantage: it keeps the outer tank from sweating in hot and humid climates. The tank condensate creates a perfect environment for bacteria growth, which can reduce the toilet lifespan, and isn’t pleasant overall. So, installing a pressure-assisted toilet can help.

And what about the downsides?

  • Very noisy. The pressure-assisted toilet makes a loud hissing sound each time the air leaves the tank, and each time it refills, which might be a problem if you or someone in the home is sensitive to sounds.
  • Requires certain knowledge for installation and maintenance. Pressure assist toilets feature more advanced technology, and you might need a professional plumber in case of installation and repair. If they aren’t properly mounted, they can become outright dangerous and explode (2). So be sure to delegate the installation to professionals.
  • More expensive. Advanced technologies also cost more, and pressure-assisted toilets are generally pricier than gravity-fed. However, with the proper maintenance, they last longer and will eventually pay off.

Our 4 Best Pressure-Assisted Toilets

Best Overall — Editor’s Choice

American Standard 2876100.020 Yorkville
Highlights:
  • 1.1-gallon flush uses 31% less water than standard units;
  • fully glazed 2 ⅛’’ trapway;
  • EverClean stain-resistant glaze;
  • standard height elongated bowl;
  • easy to install.
American Standard 2876100.020 Yorkville

The Yorkville toilet by American Standard opens our selection of the best pressure-assist toilets because of its ultra-high performance. This two-piece unit uses only 1.1 gallons of water per flush, which is 31% less than current WaterSense standards without sacrificing efficiency!

Aside from that, the Yorkville operates within the 25-80 psi range equally good, which makes it a perfect addition for literally any bathroom. Pressure assisted systems are efficient for regions with low pressure or homes with old pipes, so if this sounds like you, take a look at this model.

Other great features of the Yorkville toilet include easy cleaning thanks to the EverClean glaze that resists stains, mold, and bacteria. Plus, the pressure-assisted tank is paired with a siphon jet bowl and a fully glazed trapway, which means that clogs won’t be an issue for you.

Pros:

  • Ultra-low water consumption compared to other units
  • Clog-free performance and stain-resistant materials
  • Works with a wide pipe pressure range

Cons:

  • The seat is sold separately
  • Makes an uncomfortably loud noise when flushing

Best ADA Compliant Pressure Assisted Toilet

Kohler K-3493-96 Highline
Highlights:
  • efficient 1.4-gallon flush saves up to 2,000 gallons per year;
  • 12’’ rough-in fits everywhere;
  • requires 20-30 psi in the pipes;
  • ADA compliant bowl height (17’’ without a seat);
  • suitable for taller users.
Kohler K-3493-96

This pressure-assisted toilets review wouldn’t be full without the ADA compliant option, so, meet the Highline K-3493-96 by Kohler with a 17’’ high bowl! This is a Pressure Lite (™) model, which means that it requires less pressure in the pipes — 20-30 psi, to be exact — for performance.

The unit uses 1.4 gallons per flush, which matches current federal standards. Plus, it enhances the performance with the proprietary Class Five ® flushing technology and a canister type valve that drops the water into the bowl from all sides and results in a perfect bowl coverage and waste elimination.

Since the Highline has a built-in pressure regulator inside the tank that doesn’t allow the pressure to go above 30 psi, it isn’t as loud as other pressure-assisted toilets. Also, it easily fits into any bathroom thanks to a 12-inch rough-in.

Pros:

  • Suitable for taller users and elderly people
  • Saves you up to 2,000 gallons of water per year
  • Durable and stain-resistant ceramics

Cons:

  • The seat isn’t included
  • The trip lever comes loose quickly

Best Dual-Flush Pressure-Assisted Toilet

Zurn Z5572 Dual Flush
Highlights:
  • 1.1 GPF/ 1.6 GPF EcoFlush reduces household water use by 30%;
  • operates within 20-80 psi range;
  • fully glazed trapway for clog-free performance;
  • comfortable elongated bowl (standard height);
  • button flush actuator.
Zurn Z5572 Dual Flush

Zurn’s pressure-assisted toilet reviews are mainly positive for a reason: this dual flush toilet can reduce your household water use by 30% and still provide maximum flushing performance. This toilet works great within the 20-80 psi pressure range, which means that it makes a perfect pick for almost any bathroom!

Aside from that, the low water consumption of the Z5572 makes it compliant with the WaterSense standards, so you can choose it for your house without worries.

The unit features an elongated standard height bowl, which means that it can suit most average users, but if you need a commode for an older relative or someone with bad knees, you should probably get a higher one than this.

Finally, the Zurn toilet is covered in a stain-resistant glaze that prevents the waste from adhering. This means that you need to clean the toilet less often and will spend less time doing it.

Pros:

  • WaterSense compliant dual flush
  • Stain-resistant bowl glaze requires less time to clean
  • Suitable for homes with higher pressure in the pipes

Cons:

  • Will not suit for elderly or disabled users
  • It is really loud, especially if the pressure in the pipes is high

Best Water-Saving Pressure-Assisted Toilet

Kohler K-3505-0 Wellworth
Highlights:
  • Class Five ® flushing technology for bulk waste removal;
  • WaterSense certified 1.4-gallon flush;
  • standard height toilet bowl suits most users;
  • includes all the parts required for installation;
  • 12-inch rough-in area fits in any bathroom.
Kohler K-3505-0 Wellworth

Our final pick for the best pressure-assisted toilets selection is the Wellworth by Kohler. The K-3505-0 model features a powerful 360-degree flush that can eliminate up to 1 kg of waste at once. And it only needs 1.4 gallons to do that, which means that the Wellworth toilet can save you up to 2,000 gallons per year.

So, the commode features a Pressure Lite (™) system, which means that it has a built-in pressure sensor, which doesn’t allow the pressure in the tank to go over 30-35 psi. This system makes the toilet quieter and safer to use.

Also, the Wellworth features an elongated bowl that provides extra leg space and is more comfortable than round bowls. It measures 15.2 inches from the floor and when you add a seat, you get a toilet that is suitable for the majority of users.

Pros:

  • Saves you up to 2,000 gallons per year without sacrificing performance
  • Is safer to use thanks to the Pressure Lite (™) system
  • Operates quieter than other pressure-assisted models

Cons:

  • Even though it’s a comfort height toilet, it isn’t ADA compliant
  • The bowl isn’t that stain-resistant and may require frequent cleanings

What to Look for in a Power Flush Toilet?

Dimensions

Pressure-assisted toilets come in various sizes and shapes, but they’re generally smaller than gravity flush toilets because of a smaller tank. This allows the power flush unit to fit into smaller spaces without effort. 

However, make sure that you measure the rough-in area right. Rough-in is a distance between the finished wall and the center of the floor flange. It’s the main measurement required for installation; otherwise, your toilet just won’t fit and may leak, The most common rough-in length is 12’’, and the majority of brands have commodes that are designed to fit, but there are also 10’’ and 14’’ rough-in, so keep that in mind.

Water Consumption per Flush

Since pressure-assisted toilets are more efficient, they require less water per flush, and can easily comply with modern water conservation standards. You can choose a powerful 1.6-gallon flush if you have a large family that will use the restroom more actively. Or, pick a more efficient 1.4-gallon, 1.28-gallon, or even 1.1-gallon flush for a small household.

Finally, there are dual flush pressure-assist toilets that can improve water use even further and reduce water bills significantly in the long run.

Pressure Requirements

Since a pressure-assisted toilet uses the pressure from your water pipes, there should be some standard measurements, right?

Right.

The normal pressure range for the drinking water supply line falls between 30 and 80 psi (3). 

If the pressure is higher than 80 psi, it violates the building code and creates a potentially dangerous situation for the major leak or pipe bursting. 

On the contrary, the pressure lower than 20 psi reduces the efficiency of water appliances and may increase the chances of fecal contamination because the sewers won’t drain the waste properly.

Most pressure-assist toilets operate within the 20 to 80 psi range and ensure proper waste removal. However, if you need a quieter model, you can choose the Pressure Lite (™) models made by Kohler or American Standard.

FAQ

Yes, almost any gravity-fed toilet can be converted into a power flush. However, certain pressure-assisted tanks can be paired with specific toilet models, so be sure to check this before you buy.

Power flush toilets are much less likely to clog than standard commodes. But the blockage can still happen if you flush the non-flushable object, such as a sanitary pad or a synthetic baby wipe, down the drain.

They are generally more expensive than standard gravity-assisted toilets, and the replacement of some parts costs more as well. However, the modern market constantly improves and can offer you pressure-assisted toilets for any budget.

If it isn’t properly installed and secured to the water supply, a pressure-assisted tank can explode and shatter the outer ceramic cistern, which will result in injuries. Always consult a plumber for installation to prevent accidents.

With proper maintenance, a pressure-assisted toilet is as efficient as the gravity flush and can last for at least a decade before the tank or bowl require replacement.

Owner - Mary O. Frazier

Founder

Mary O. Frazier

Mary O. Frazier — lead author of our website, connoisseur of interior design and plumbing. I will tell you the most interesting and important facts about household items. She reads a lot, plays chess and collects useful information for you. You can read more about her here.

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