Best One-Piece Toilets with Seamless Designs – 11 Reviewed in 2023

Though one-piece toilets tend to be less common than two-piece ones, they offer a sleek design that’s both functional and aesthetically pleasing. One-piece toilets are also easier to clean and have a lower risk of leaking as well. 

Two-piece toilets seem to have the same features as their one-piece counterparts and often cost much less. So, why are one-piece units so popular? And what are the advantages of those toilets?

Below we share some considerations when looking for a new toilet, and our top choices for the best one-piece toilets!

Our Top One-Piece Picks

›	Editor's Choice:Editor's ChoiceWe pick our favorite model based on style, function, customer feedback, and cost effectiveness.	Kohler Veil
›	Most Water Efficient:	TOTO Neorest
›	Highest Flush Score:Highest Flush ScoreWe chose the highest MaP score as the winner.	American Standard Champion 4
›	Review Champion:Review ChampionWe average reviews from top online sellers, also taking into consideration the number of reviews. We present the model most consumers are pleased with.	WoodBridge T-0001-CH
›	Most Reviewed:	Kohler Santa Rosa
›	Runner Up:	TOTO Eco Ultramax

Comparison of the Best One-Piece Toilets in 2023

Advantages of One-Piece Toilets

✓ Seamless Design with Fewer Separate Parts

One-piece models are often smaller, making them ideal for compact bathrooms. Plus, they have a sleeker design that fits well with modern bathrooms. Finally, single-piece toilets come as a whole unit, which prevents possible problems with shipping.

Reviews of the Top 11 One-Piece Toilets on the Market

1. American Standard Champion 4 – Strongest Flush

We’re starting off this list strong, with our all-time favorite – the Champion 4. This toilet is another solid choice that prioritizes water efficiency and suction strength. 

Flushing Power

This toilet uses 1.6 gallons per flush and is a leader in clog-free performance after many uses. The unit’s quiet flush can move up to 70% larger masses than most toilets because of the Champion 4 Flushing System. 

The four-inch piston Accelerator flush valve helps remove most waste loads in just one flush. The extra-large trapway also eliminates waste quickly and hassle-free. The toilet’s MaP score is 1,000 grams – it doesn’t get better than that!

The Design 

This features a “right height” of 16.5 inches, to ensure maximum comfort. It is ADA-compliant, with a comfortable elongated siphon action jetted bowl. 

The unit comes with an EverClean surface which prevents bacteria, mold, and mildew buildup. Like most toilets in this price range, it features a slow-close seat. 

The American Standard Champion 4 comes in white, bone, or linen, with a chrome trip lever. The lever can be swapped for a white, polished brass, or satin one instead. The toilet comes with a ten-year warranty. 

Read more about the American Standard Champion 4 with our spotlight article here.

Other Champion 4 Models

Our team collected all Champion 4 model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Champion PRO	211AA104.020	Two-piece	1.28	Elongated	EPA Compliant	Spec Sheet
Portsmouth Champion PRO	213CA104.020	Two-piece	1.28	Elongated	Water efficient and uses single flush type	Spec Sheet
Retrospect Champion PRO	212BA104.020	Two-piece	1.28, 1.6	Round	PowerWash® rim scrubs bowl with each flush	Spec Sheet

Summary of Recent Reviews

This comfort height toilet is a favorite among reviewers.  Several mention its powerful flush, with many stating they’ve yet to have a clog. Reviewers love the look of this toilet, sharing that it complements most bathroom designs. Some buyers didn’t find the seat comfortable, so consider buying a seat separately.

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2. Woodbridge T-0001-CH – Review Champion

 

TODAY’S DEAL on AMAZON     TODAY’S DEAL on WALMART

 

Our next pick is this Woodbridge model because of its budget-friendly price and solid features. 

Flushing Power

The dual flush system averages about 1.2 gallons per flush, saving you at least 20 percent of your annual water usage. Smaller waste loads can be flushed with 1 gallon per flush while larger ones take up 1.6 gallons. 

It has been tested for water efficiency and found to comply with the strict EPA and CSA guidelines. The toilet has a fantastic MaP score of 1,000 grams. 

The toilet uses a siphoned flushing tube that reduces noise and helps prevent leaks, clogs, and other problems caused by waste. 

Design

The Woodbridge elongated toilet is considered a luxurious option by many customers with its sleek and clean design. Plus, it is very easy to clean as the toilet is designed to have minimal crevices, corners, and grooves.

The skirted trapway creates a flawless look and enables easy cleaning. The flush button comes in matte black, brushed nickel, brushed gold, or oil-rubbed bronze. A  wax ring, floor bolts, and a soft closing seat, along with stainless steel seat hinges, are included. 

Read more about Woodbridge toilets here.

What Buyers Say

Buyers like the power of this flush, and that it has a dual flush option, allowing you to save on water.  The flush is powerful, and the one-piece gives a clean, stylish look.  Several mentioned that this install is a little challenging so consider hiring a professional if you aren’t experienced.

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3. Kohler Santa Rosa – Most Reviewed

The Kohler Santa Rosa is well-priced and durably built. Its elongated tank makes the model unique yet functional, as various items can be set upon it. 

Flushing Power

The Kohler Santa Rosa utilizes 1.28 gallons per flush. It has a 2 ⅛” fully glazed trapway that efficiently removes waste in a few seconds. The model has an AquaPiston canister that increases the natural suction strength. 

The canister flush packs a strong water push to eliminate any possible clogs due to waste, paper, or other debris. However, customers have reported that the flush system does make a little more noise than other models in this price segment.

Design 

The Kohler Santa Rosa elongated toilet is designed with an integrated bowl and tank for a seamless and easy-to-clean design without any crevices, nooks, or corners.

It is made with a comfort height seat that offers individuals chair-like seating, standing at 17 inches. The seat and the lid are also included in the packaging, with clear instructions on how to set it up and adjust all the necessary screws and bolts.

The toilet is available in white, biscuit, almond, ice gray, and black. A bolt cap accessory pack, tank accessory pack, tank cover, and trip lever are included, in addition to a Quiet-Close seat. A supply line must be purchased separately. 

Read more about the Santa Rosa toilet in our review here.

Other Kohler Santa Rosa Models

Our team collected all Kohler Santa Rosa model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Santa Rosa	K-3811-0	One-piece	1.6	Elongated	AquaPiston® canister allows water to flow into the bowl from all sides (360°)	Spec Sheet
Santa Rosa	K-30810-RA-0	One-piece	1.28	Elongated	Easy-to-flush canister design requires less force to actuate than a 3" (76 mm) flapper	Spec Sheet
Santa Rosa	K-30810-0	One-piece	1.28	Elongated	Revolution 360 swirl flushing technology keeps the bowl clean longer	Spec Sheet
Santa Rosa	K-30812-0	One-piece	1.28	Elongated	ContinuousClean ST system to dispense cleaning solution with every flush	Spec Sheet

What Customer Say

Customers are pleased with this durable, efficient toilet.  Some were not happy with the included seat, so maybe consider buying one separately. The comfort height makes this a comfortable toilet that would be a great addition to any bathroom.

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4. TOTO Eco Ultramax – Runner Up

The Eco-UltraMax saves you money and water with its low water usage. 

Flushability 

Another option made by the famous TOTO brand, this toilet is an excellent choice for just about anybody. To start, its E-max system consumes only 1.28 gallons per flush, saving you money on bills each month.

Design

Further, the toilet has a sleek, and elegant design. The Eco-Ultramax has CEFIONTECT glaze that reduces bacterial buildup and makes cleaning hassle-free. 

The one-piece design significantly decreases any chance of leaks, and the sleek design ensures an easy-to-clean surface for the entire model. The toilet comes in three models: an elongated bowl with CEFIONTECT and a SoftClose seat, an elongated bowl with a SoftClose seat, or a round bowl with a SoftClose seat. 

The toilet comes in cotton, bone, colonial white, or Sedona beige. A chrome trip lever is included.

Other TOTO Eco Ultramax Models

Our team collected all TOTO Eco Ultramax model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Eco Ultramax	MS854114E#01	One-piece	1.28	Elongated	Elongated one-piece toilet	Spec Sheet
Eco Ultramax	MS853113E#01	One-piece	1.28	Round	Round bowl one-piece toilet	Spec Sheet
Eco Ultramax	MS854114EG#01	One-piece	1.28	Elongated	With CEFIONTECT Ceramic Glaze elongated one-piece toilet	Spec Sheet
Eco Ultramax	MS854114ELG#01	One-piece	1.28	Elongated	Elongated bowl with CEFIONTECT® ceramic glaze. ADA Compliant toilet	Spec Sheet

Our Take on Reviews

This toilet was an easy install for most buyers.  The flush is powerful, leaving a clog-free, clean bowl for most reviewers.  This also comes with a soft-close seat which means one less accessory to purchase.  The tank is smaller than older models, lending itself to a sleek, modern look.

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5. Kohler Veil – Editor’s Choice

The Kohler Veil Comfort Height toilet is most distinguishable by its design. Smooth, sleek, and elegant, the toilet looks almost futuristic with its minimalist style. In addition to its interesting look, the toilet has great quality customizable features that we love. 

The Kohler Veil meets all ADA code requirements, unlike the Kohler Karing 2.0, and comes with an upgraded 17” chair-level seat, comfortable for all. 

Flushing Power

One of our favorite  Kohler Veil features is its special pump-assisted dual flush that allows peak flushing performance each time. The pump only consumes .8 to 1.19 gallons of water per flush, making the toilet sustainable and cost-effective. 

The tankless unit also easily attaches to the main water supply line. The Kohler Veil uses an in-wall insulated and durable tank and carrier system, saving you much more space than the Veil one-piece elongated dual flush skirted trapway toilet. The Veil also has an actuator plate for easy flushing. 

In the case of an emergency, the Kohler Veil includes a backup feature that works even during a power outage – with up to 100 flushes! This is a great development from the 2021 Kohler Veil which does not include flush support or any of the Comfort Height’s smart-tech features. 

Customizable Features

The toilet comes with an LCD remote control that adjusts the temperature, pressure, light, and more. With the touch of a button, you can customize the toilet to your liking. Activate the seat warmer during cold nights or utilize and adjust the warm-air drying system when you’re done. Motion-activated hands-free Quiet-Close™ cover works like a charm as well.

Cleanliness

Unlike its intelligent counterpart, the Kohler Brazn, the Kohler Veil utilizes Kohler’s UV Light Cleaning Technology which sanitizes your bidet wand, reducing bacteria automatically by 99.9% every 24 hours. Sanitization is automatic, so you don’t have to worry about cleaning after you’re done. 

While the Kohler Veil is a bit pricey, especially when compared with the Kohler Brazn and Karing 2.0’s one-piece design, we think its’ pump-assisted flushing and personalized settings make it well worth the buy. The Kohler Veil’s Comfort Height also reduces tension on your knees by elevating your sitting position nearly two inches higher than the other models, such as the Veil Wall-hung Compact elongated dual-flush toilet.

You can watch Kohler’s Veil Intelligent Toilet with Bidet Seat overview video here to get a more visual understanding of the toilet’s inner workings.

Facts Worth Noting

• Uses 2” x 6” studs.
• Tank installs inside the wall
• Dual flush offers a choice of 0.8 or 1.19 gpf (3.0 or 4.5 lpf)
• Automatic self-cleaning function utilizes UV light and electrolyzed water systems
• Has automatic deodorization system
• Includes motion-activated, hands-free opening/closing features
• Emergency flush supports up to 100 flushes during power outage
• Comes with complete toilet and seat, supply stop valve, braided inlet supply hose, power cord, and remote control
• Does not come with a bidet seat

*Also to note, the Kohler Veil is only available in white. 

Other Kohler Veil Models

Our team collected all Kohler Veil model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Veil	K-1381-HC-0	One-piece	0.8, 1.28	Elongated	Hidden cord design conceals bidet seat cords. Includes bidet water inlet hose.	Spec Sheet
Veil	K-5402-0	One-piece	0.8, 1.6	Elongated	One-piece wall-hung smart toilet with integrated cleansing and dual flush functionality	Spec Sheet
Veil	K-76395-0	One-piece	0.8, 1.6	Elongated	Wall-hung compact elongated smart toilet bowl. Motion-activated, hands-free opening/closing of cover.	Spec Sheet
Veil	K-1381-0	One-piece	0.8, 1.28	Elongated	One-piece elongated toilet with skirted trapway, dual-flush	Spec Sheet
Veil	K-6299-0	One-piece	0.8, 1.6	Elongated	One-piece wall-hung toilet. ADA compliant.	Spec Sheet
Veil	K-6300-0	One-piece	0.8, 1.6	Elongated	Wall-hung elongated toilet bowl with hidden cord capability	Spec Sheet

Our Take on the Reviews

The Kohler Veil has overwhelmingly positive reviews, with customers boasting about the heated seat, night-light, and hands-free open/closing features. Most users agree the toilet is a high-quality investment piece. Some customers mention the toilet’s installation may be a bit difficult for certain plumbers due to the model’s weight.

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6. TOTO Neorest – Most Water Efficient

If you’re looking to splurge for some extra perks, the TOTO Neorest is the way to go. 

Flushing

The toilet has a dual flushing mechanism, using .8 gallons per flush or 1 gallon depending on the wasteload. Even with its water efficiency, the Tornado Flush siphon jet flushing system is ultra-powerful, eliminating chances of streaks or stains. The toilet also has a backup manual flush that can be used in emergency situations. 

The toilet has an auto flush option allowing you to have a hands-free bathroom experience. 

Bidet Features

The TOTO Neorest comes with a multifunctional remote that turns on the bidet. The bidet has three wash modes, front, rear, and soft, and has oscillating and pulsing comfort washing. You can adjust the spray position for maximum comfort levels as well. 

Other Features

While the TOTO Neorest is pricier than the other TOTO models on this list, it comes with many convenient features that improve the user experience.

The toilet has an energy saver timer and a built-in air purifying system to get rid of nasty lingering odors. On this model, you can control the flush and set the seat temperature by using the battery-operated remote control. 

The toilet’s skirted design and high-profile tank make cleaning easy while the non-stick finish practically eliminates instances of solid waste sticking around. TOTO’s CEFIONTECT technology further eliminates cleaning time by reducing bacterial buildup. 

The toilet bowl is made of vitreous china while the seat and cover are made of plastic. It is ADA compliant, with a seat height of 17 ¼”.  The toilet’s top unit is only compatible with the CT992CUMFG elongated bowl. The toilet is only available in white.

Other TOTO Neorest Models

Our team collected all TOTO Neorest model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Neorest RH	MS988CUMFG#01	One-piece	1.0, 0.8	Elongated	The design of the RH is characterized by soft curves without sharp corners	Spec Sheet
Neorest AH	MS989CUMFG#01	One-piece	1.0, 0.8	Elongated	The AH has an edgy shape that leaves a sharp impression when seen from any angle	Spec Sheet
Neorest NX1	MS900CUMFG#01	One-piece	1.0, 0.8	Elongated	Has sophisticated elliptical silhouette which is inspired by the simple, organic beauty of an earthen vase hand thrown by a craftsman on a pottery wheel	Spec Sheet
Neorest NX2	MS901CUMFX#01	One-piece	1.0, 0.8	Elongated	ACTILIGHT® Clean light cleaning system built in the lid	Spec Sheet
Neorest EW	CWT994CEMFG#01	One-piece	1.28, 0.9	Square	Ultra-modern wall-hung design. Back-up manual flush	Spec Sheet
Neorest AC	CWT996CEMFX#01	One-piece	1.28, 0.9	Square	Features revolutionary technologies such as Actilight® and eWater+® to help reduce the need for frequent cleaning	Spec Sheet
Neorest 750H	MS993CUMFX#01	One-piece	1.0, 0.8	Elongated	Neorest 750H delivers an unparalleled sense of relaxation to you in the most comforting and refreshing ways possible	Spec Sheet

The Review Buzz

Buyers agree that this toilet is worth the hefty price tag! This stylish toilet is an investment for your home. Users like that along with its effective flush, the toilet includes features to assist with your personal hygiene. Reviews praise the seat for being comfortable and heated.

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7. TOTO Eco Soiree

This dependable toilet has a large, box-like base that takes up a bit more space in your bathroom than other models. 

Flushing

TOTO toilets are designed with a double cyclone flush system that uses a minimal amount of water to still clean the toilet bowl thoroughly. The toilet uses 1.28 gallons per flush in its high-efficiency Tornado Flush system. With just one press of the lever, water swirls around the bowl picking up all the waste and potential residue which is then sucked out by the large flush valve. 

Design 

The seat is designed at a height of 17 ⅜”  making it optimal for short and tall individuals alike. The toilet is ADA compliant and comes with an elongated front bowl and SoftClose seat. 

Though optional, we recommend getting the CEFIONTECT glaze to reduce bacterial buildup on the toilet’s exterior. The TOTO-patented glaze requires only a wipe down with mild soap and water. The one-piece skirted design also eliminates dirt accumulation in any nooks or crannies. 

The toilet’s trip lever has a chrome finish that prevents rusting, scratches, and scuff marks. 

Similarly, the porcelain is easy to clean and much more resistant to water and rust markings. The toilet is available in cotton, bone, colonial white, Sedona beige, and ebony (not available in CEFIONTECT). 

A 10” or 14” Unifit rough-in is sold separately. 

Get to know more about the TOTO Eco Soiree in our review here. 

Summary of Recent Reviews

Customers like the toilet’s Tornado flush system and fully ADA-compliant features, if the toilet is installed with the trip lever on the approach side. However, this toilet is pricier than many similar units that have the same standard features. Without a bidet or heating features, this toilet is a standard, no-frill model at a higher price than necessary. 

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8. TOTO Ultramax Toilet

This easy-to-use toilet keeps it simple but classy. 

Flushing

The TOTO Ultramax’s G-Max flushing system uses an extra-large siphon jet for maximum suction power and a wide 3” flush valve to pack a punch in every flush. The toilet’s fully glazed trapway also reduces the chance of clogging. The Ultramax uses 1.6 gallons per flush, which fully wipes away waste and any potential streaks. 

This model is reliable, with a relatively low flush noise level. 

More Features

Like most TOTO toilets, the Ultramax comes with the CEFIONTECT glaze to reduce any grime accumulation on the toilet’s exterior. Furthermore, the one-piece design and high-profile tank only need slight maintenance, with a simple water and soap combo. The toilet stands at a standard 15 11/16”. 

The Ultramax comes in three models: an elongated bowl with CEFIONTECT and SoftClose seat, an elongated bowl and SoftClose seat, or a round bowl with a SoftClose seat. 

Other TOTO Ultramax Models

Our team collected all TOTO Ultramax model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Ultramax	MS853113S#01	One-piece	1.6	Round	Round Bowl with SoftClose Seat	Spec Sheet
Ultramax	MS854114SL#01	One-piece	1.6	Elongated	ADA Compliant	Spec Sheet

The Reviewer Buzz

Overall, customers are satisfied with the effective flush of this toilet and its comfortable height. The most common complaint is the toilet’s state upon arrival. Many individuals report receiving broken parts, such as a fractured bowl. After contacting customer service, they were able to get new parts re-ordered at no extra cost.

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9. Kohler Santa Rosa Black Toilet

The Kohler Santa Rosa’s name isn’t the only thing that’s beautiful about the unit. 

Flushing

This toilet uses 1.28 gallons per flush. What makes the Kohler Santa Rosa’s flushing technology so strong is the combination of the AquaPiston canister, precision-engineered tank, and fully glazed trapway. Only two pounds of force is needed to flush the toilet. 

Each flush effectively swirls around the bowl to pick up any waste that’s then suctioned into the drain in a matter of seconds. 

The toilet’s canister reduces chances of leakage by having 90% less exposed seal material than traditional 3” flappers. The canister also requires less actuation force than typical flappers. 

Design 

The Kohler Santa Rosa has a Comfort Height of 16.5” that’s easy on the knees and legs. The elongated bowl distributes user body weight for an increased comfort level. The toilet comes with a Quiet-Close elongated seat as well. 

The Santa Rosa includes a bolt cap accessory pack, tank accessory pack, tank cover, and trip lever. It’s important to note that a supply line must be purchased separately. The toilet comes in white, biscuit, almond, ice gray, and black. The polished chrome trip lever is located on the left-hand side.

Other Kohler Santa Rosa Models

Our team collected all Kohler Santa Rosa model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Santa Rosa	K-3811-0	One-piece	1.6	Elongated	AquaPiston® canister allows water to flow into the bowl from all sides (360°)	Spec Sheet
Santa Rosa	K-30810-RA-0	One-piece	1.28	Elongated	Easy-to-flush canister design requires less force to actuate than a 3" (76 mm) flapper	Spec Sheet
Santa Rosa	K-30810-0	One-piece	1.28	Elongated	Revolution 360 swirl flushing technology keeps the bowl clean longer	Spec Sheet
Santa Rosa	K-30812-0	One-piece	1.28	Elongated	ContinuousClean ST system to dispense cleaning solution with every flush	Spec Sheet

Buyer’s Buzz

Buyers like this stylish, powerful toilet with its sleek and modern look. Users rave about the flushing power and comfort height.  While some experienced issues with the toilet shattering during shipping, they were able to quickly receive replacements.

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10. Kohler Kathryn Toilet

This toilet is compatible with other items in the Kohler Kathryn collection, so if you like what you see, there’s more where that came from!

Flushability 

The Kohler Kathryn Comfort Height toilet is another phenomenal example of Kohler’s AquaPiston technology being put to work. The toilet’s flush valve optimizes performance by using the natural force of gravity to expel any type of waste. 

The toilet’s canister lets water flow into the bowl from all angles and requires less actuation force than standard flappers. Just like the Santa Rosa, this model’s canister design reduces the chance of leakage by having 90% less exposed material than a 3” flapper. 

The toilet delivers a fast and powerful flush even while consuming only 1.28 gallons of water. 

Design

The Kohler Kathryn is a Comfort Height model, standing at 16 ⅜”. The toilet is designed with a concealed trapway and Clean Caps low-profile bolts to make cleaning especially simple. 

The Kathryn comes with a Quiet-Close Quick-Release toilet that is easily removable for deep cleaning.

The toilet’s polished chrome trip lever is left-handed. A supply line is not included. The toilet comes in white, biscuit, dune, ice grey, sandbar, Mexican sand, cashmere, thunder grey, or black black.

Other Kohler Kathryn Models

Our team collected all Kohler Kathryn model variations within this collection to help you compare the differences.

Model Name	Model Number	Style	GPF	Bowl Shape	Major Differences	Resources
Kathryn	K-3940-RA-0	One-piece	1.28	Elongated	One-piece compact elongated 1.28 GPF chair height toilet with right-hand trip lever.	Spec Sheet

We Read the Reviews

This toilet gets high reviews from its buyers. Many were pleased with the modern design of the toilet, making it a great addition to their bathrooms. Installation was easy, and it has an effective flush, even with its minimal water usage. Unfortunately, some users report receiving mismatched parts in the mail that required a reorder from the manufacturer.

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11. SaniCanada 942 Toilet

The last toilet to make our piece list is the SaniCanada London. We liked the model’s simple and clean look, as well as the dual-flush mechanism. 

Features

This toilet comes with a dual-flush system for either a 0.8 or 1.28-gallon flush, which saves lots of water annually. The toilet requires almost no maintenance and can be cleaned in a matter of minutes. The Dual Hurricane Flush system expels waste in a forceful yet low-noise manner. 

Its standard 15.5” bowl height is suitable for most users and the elongated bowl provides an added layer of comfort. The toilet is made of glazed ceramic, with a sleek, glazed skirted trapway. The toilet has no ridges so dirt or grime can be wiped off in one swipe. 

The toilet comes with side bolt cover parts, a tank lid with chrome actuator push buttons, a quick-release toilet seat with hinges, a wax ring, and toilet bowls.

Summary of Reviews

Users tend to like the SaniCanada London because of its simple nature.  The unit is praised for its modern look and flushing system. Some users report having difficulties installing the unit, eventually calling for professional help.

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Buyer’s Guide

Choosing the right one-piece toilet is not always simple. There are various things to consider, which might be difficult if you are buying a one-piece toilet for the first time.

Here we’ve listed four important details to keep in mind when buying a new one-piece toilet:

Dimensions and Rough-in Requirement

Most toilets will be 12 inches from the wall, which is called a rough-in dimension. However, be sure to measure your bathroom’s rough-in before buying a toilet, in case you need a 10 or 14 inch option instead. It’s also important to keep an ideal seat height in mind to ensure you new toilet will fit every member of the family.

Water Efficiency

Water efficiency has two advantages: it saves you money while also saving the environment. But does using less water affect the flush power? Basically, most modern toilets consume 1.28 gallons of water per flush while maintaining plenty of power. Some toilets might use up to 1.6 gallons, but more than that is not water-efficient.

It’s a common belief that the more water the toilet uses, the cleaner it will be. However, high water consumption flushing leads to huge waste over time. Toilets usually account for 30 percent of water usage in an average household. To combat any water waste, modern toilets use much less water while maintaining efficiency. Look for a model with an EPA WaterSense label to ensure you purchase an efficient option.

Easy Cleaning

The obvious advantage of single-piece models is the ease of cleaning. Since the bowl and the tank are connected, there is no place for bacteria to hide. You will especially notice the difference if you’ve ever tried to clean a two-piece toilet. Additionally, the chance of leaking is minimal, since the bowl and the tank are one piece. Looking for a model with a simple and sleek design will increase the ease of cleaning.

Take a look at our homemade toilet cleaning guide 

Highly Durable

Any type of equipment, including toilets, is more durable with fewer parts. A two-piece toilet has a rubber gasket which can cause leaking over time. By looking for a simple one-piece option with minimal surplus parts, you’ll lower your risk of broken parts over time. Pay attention to user reviews and warranty options as well to ensure you invest in a durable, high quality toilet. 

Few Disadvantages

Of course, one-piece models have some disadvantages, too. First, they are quite expensive, and if you buy a cheaper model, it can be a risk, since they may be made of low-quality materials.

Also, if the toilet bowl breaks, you cannot replace it without buying a completely new toilet, as all the parts are within one piece.

Further, many one-piece toilets are usually smaller and lower height, which is not ideal for tall persons. However, if you buy a wall-mount toilet, you can place it a few inches higher to increase comfort.

In the end, the main downside to one-piece units is their weight. Because you can’t separate any part of the toilet, the full unit is usually quite heavy, which might be a problem during installation. We strongly advise you to call a professional to install your one-piece toilet, or at least have multiple people to help. As some one-piece models can be up to 90 pounds or heavier, installing one alone is almost impossible.

Installation Process

Installing a one-piece toilet is actually very simple, but the process can vary depending on the specific toilet.  

To install your new toilet, start by turning off the water supply and getting rid of the old toilet. Remove the old toilet carefully and clean any spills or excess from the floor. Then, remove the old wax ring to make sure that the new toilet won’t leak. To completely remove the leftover wax, you should use a scraping tool.

Next, ensure that there are bolt holes in the new toilet. If there are none, you will have to drill holes on the floor. But first, remove any excess material so that it doesn’t reach the wax ring.

When you are done, it’s time to install the new wax ring.  Stick the wax ring to the toilet to make sure it’s centered properly. If needed,  simply rotate the ring until everything is aligned.

To lay down a new toilet, ideally, have someone else there to help. Once the bolts properly line up with the holes on the floor, bolt the toilet down. You can complete this step with nuts and washers which are usually included in the package.

Then, install the toilet flush, and finally, the toilet seat. Seats usually have plastic screws, so you simply need to put them in place and tighten them. After you’ve done the final step, turn the water back on and you are finished. Your toilet is ready for use.

Frequently Asked Questions