Best One Piece Toilet: HOROW T0338W Leads

The best one piece toilet for homeowners is the HOROW T0338W, because it pairs a documented 17.3" ADA chair height with a 12" rough-in and a 1-year warranty, which no other pick here states in full. If your bathroom is a tight secondary space, the DeerValley Compact with its 24.6" depth and standard-height round bowl is the smarter fit. Both run 1.1 GPF on the light flush. The rest of this guide sorts six one-piece toilets by who each one is actually for.

Best one piece toilet for homeowners at a glance

How I screened these six down

I started with the criteria a homeowner can actually verify before a plumber shows up, then weighted them. Seat height came first, because it is the single number people regret. Rough-in came second, because getting it wrong means the toilet does not sit flat against the wall. Everything else followed.

I lined up the published specifications side by side and ranked them this way:

1. Documented fit numbers. Seat height, rough-in and footprint dimensions had to be stated, not implied.
2. Water use. The light-flush figure carries real cost over years, so a lower one earned points.
3. Cleaning design. A skirted base hides the bolts and curves that trap grime.
4. Warranty on paper. A stated term beats silence.

Here is the honest catch. The word "homeowners" is a search filter, not a spec. Amazon returned these because they are one-piece toilets, not because any listing certifies homeowner suitability. So I treat that word as a reminder to check the two things a renter never worries about: the rough-in in your floor and the warranty in writing. Two picks list no rough-in at all, and three list no warranty. That thinned the field fast.

What actually decides a one-piece toilet

Most guides for the best one piece toilet for homeowners lead with flush power. That is the wrong headline. Every pick here claims a strong flush, and several cite the same MAP 1000g figure, so it barely separates them. The real decider is fit: seat height and rough-in.

Seat height is the number your knees feel. Standard height sits lower. ADA chair height runs 17" to 17.5" across this set, which is easier for taller users and anyone who dislikes a low seat. The HOROW lists 17.3". Both Casta Diva models list 17.5" and 17.2". The DeerValley Compact is the one standard-height option, and that is a deliberate choice, not a flaw.

Rough-in is the distance from the finished wall to the drain center, and 12" is the common one. The HOROW, both DeerValleys and the BayRoll all list 12". The two Casta Diva listings state no rough-in at all, which is a real gap when you are ordering something you cannot easily return. Flush numbers make the marketing. Fit numbers make the decision.

1. HOROW T0338W One Piece Toilet with ADA Chair Height — Best overall

The HOROW T0338W is the pick I'd default to, because it is the only one here that states seat height, rough-in and a warranty together.

Best for: homeowners who want a documented seat height, rough-in and warranty Skip it if: your drain sits 10 inches from the wall and you buy the wrong version

What sets the HOROW apart in this group is completeness. It lists a 17.3" ADA chair height, a 12" rough-in, a 99.2 lb shipping weight and a 1-year warranty under model T0338W. Only one other pick states a warranty, and none matches this full fit picture. The footprint is 26 x 26.6 x 15 in, and HOROW calls it a compact elongated bowl for small bathrooms.

HOROW says the flush uses a siphon system with a fully-glazed 2" trapway and dual 1.1/1.6 GPF options. The brand also says both 10-inch and 12-inch rough-in versions exist, which is genuinely useful, and also the trap. Order the version that matches your floor, because the wrong one will not seat correctly. The seat is a soft-close PP unit that HOROW says is screw-fixed to stay put.

It is the second-cheapest of the mid-priced picks and sells faster than most of this set. Against the elongated Casta Diva models, the bowl is a touch shorter. That is the trade for the documentation.

Pros:

• Only pick listing seat height, rough-in and warranty together
• 17.3" ADA chair height for easier sitting
• 10-inch and 12-inch rough-in versions offered
• 1.1 GPF light flush claim
• Soft-close screw-fixed PP seat

Cons:

• Warranty is only 1 year
• Heaviest here at 99.2 lb to maneuver
• Two rough-in versions mean easy ordering mistakes
• Elongated bowl slightly shorter than the Casta Diva pair

2. DeerValley Compact One Piece Toilet Standard Seat Height — Best minimal setup

The DeerValley Compact is the easiest one to slot into a tight bathroom, because it is the shallowest and lightest here.

Best for: a small second bathroom where a standard-height round bowl fits better Skip it if: you or someone in the house needs a taller ADA seat

This is the compact specialist. At 24.6 in on its shorter dimension and 78 lb, it is the lightest of the six and the easiest to carry up a flight of stairs alone. DeerValley lists it as a round bowl with a standard seat height, sized for tight spaces, and rates the seat to 250 lbs. It uses a 12" rough-in and a chrome button, model DV-1F52812-AMZ.

DeerValley says the dual-flush system runs 1.1/1.6 GPF and saves up to 16,500 gallons a year against an old 3-plus GPF fixture. The fully skirted base removes the crevices around the trap. The brand also says the soft-close PP seat operates at 28dB, and that the box ships with the valve pre-assembled plus a wax ring, bolts, wrench and manual. That last point matters if this is your first install.

It carries a 1-year warranty, same as the HOROW. The catch is the standard seat height. If your household wants ADA comfort height, this is the one pick that cannot offer it, and the round bowl is smaller than the elongated options.

Pros:

• Lightest here at 78 lb
• Shallowest footprint for tight rooms
• Full install kit included per the listing
• 1-year warranty stated
• Fully skirted base for easier cleaning

Cons:

• Standard seat height, not ADA comfort height
• Round bowl smaller than elongated rivals
• Light flush 1.1 GPF, not the lowest here
• Round bowl less roomy for taller users

3. DeerValley Elongated One-Piece Toilet with Comfort Chair — Best for pros

The DeerValley Elongated is the one an installer would reach for, because it pairs a rimless bowl with a low 1 GPF light flush.

Best for: an installer who wants a rimless bowl and low water use Skip it if: you need a published warranty in writing

The standout feature here is the rimless bowl. DeerValley says the seamless one-piece build has a low-profile design and a rimless interior, which means no hidden rim channel to scrub. It lists an ADA-height 17.5" seat, a 12" rough-in and dimensions of 26.6 x 26.8 x 14.5 in, at 94.8 lb, model DV-1F0437.

DeerValley says the dual flush runs 1 or 1.28 GPF and cites a MAP 1000g rating. That 1 GPF light flush ties for the lowest in this set, so it is the frugal choice on water. The seat is soft-close and quick-release, which lets you pop it off for a deep clean. The bowl is elongated, so it is roomier than the Compact's round shape.

It is the second-cheapest pick overall and sits in the entry tier. The clear weakness is documentation: no warranty term is listed, and it is the slowest seller of the group. A pro who trusts the brand will not mind. A first-time buyer who wants a written warranty should look at the HOROW instead.

Pros:

• Rimless bowl, no rim channel to scrub
• 1 GPF light flush ties for lowest here
• ADA 17.5" seat height listed
• Elongated bowl roomier than round options
• Entry-tier price for an ADA design

Cons:

• No warranty term listed
• Slowest seller of the six
• Heavy at 94.8 lb
• Rimless flush relies on the maker's claim

4. BayRoll One Piece Sleek Modern Toilet — Best budget pick

The BayRoll is the one to buy when price leads, because it is the cheapest of the six and still lists an ADA seat.

Best for: a landlord or secondary bathroom on the tightest budget Skip it if: you want a full spec sheet before you buy

The BayRoll is the cheapest pick in this set, and it does not strip out the fit basics to get there. It lists a 17" ADA chair height, a 12" rough-in and a footprint of 27 x 25.6 x 14.8 in at 93 lb, model SH-S001. BayRoll calls it a fully skirted round bowl aimed at apartments, studios and secondary bathrooms.

BayRoll says the dual flush runs 0.9/1.28 GPF, which is the lowest light-flush figure in the whole group, and cites a MAP 1000g score. The brand also says two side holes make floor mounting easier, and that the soft-close seat is quick-release for cleaning. For a rental unit or a rarely used guest bath, that is a sensible package.

The honest gap is data. BayRoll lists no warranty and no seat-height source beyond the ADA claim, and the round bowl is less roomy than the elongated picks. It is the budget pick, not the documented pick. If the low water figure and price matter more than paperwork, it earns its place.

Pros:

• Cheapest of the six
• 0.9 GPF light flush, lowest here
• 17" ADA chair height listed
• Fully skirted base for cleaning
• Quick-release soft-close seat

Cons:

• No warranty listed
• Round bowl less roomy than elongated picks
• Fewest published specs after the Casta Diva pair
• Flush figures rely on the maker's claim

5. Casta Diva Elongated One Piece Toilet 17.2" ADA — Runner-up

The Casta Diva Elongated is the interesting outlier, because it is the only pick with a hands-free foot-kick flush.

Best for: anyone drawn to hands-free foot-kick flushing Skip it if: you compare on published specs, since few are listed

This one earns its slot on a single distinctive feature. Casta Diva says it flushes via a foot-kick or a side button, which is the only hands-free option in this group. The brand also says it uses an air-pressure assisted system at 1.0 GPF that works even in low-pressure homes, with no electricity required and a siphon jet rated MAP 1000g. It lists a 17.2" ADA comfort height, model CD-W001, with dimensions of 19.3 x 26.9 x 15 in.

The foot-kick flush is a genuine hygiene draw in a shared or family bathroom, where nobody wants to touch the button. The 1.0 GPF air-assisted claim also puts water use near the bottom of the set.

But this is a premium-priced pick with a thin spec sheet. No rough-in, no weight and no warranty are listed, and those are the exact numbers a homeowner needs before ordering. It sits above the mid-priced HOROW while telling you less. Buy it for the foot flush, and confirm your rough-in with the seller first.

Pros:

• Only hands-free foot-kick flush here
• 1.0 GPF air-assisted claim
• 17.2" ADA comfort height listed
• Elongated bowl for more room
• Non-electric operation per the listing

Cons:

• No rough-in listed
• No weight or warranty listed
• Premium price for fewer published specs
• Air-assist performance rests on the claim

6. Casta Diva One Piece Toilet Elongated 17.5" ADA — Best premium

The Casta Diva 17.5" is the top-shelf option, because it lists the tallest ADA seat in the set alongside a WaterSense dual flush.

Best for: a full remodel where the tallest ADA seat matters most Skip it if: you are watching the price closely

This is the most expensive pick here, and it leads on seat height. Casta Diva lists a 17.5" comfort-height elongated bowl, model CD-T006, with a silver button and dimensions of 26.6 x 25.4 x 14.6 in. That 17.5" ties the DeerValley Elongated for the tallest seat in the group, which is the number that helps seniors and taller users most.

Casta Diva says the dual flush runs 1.0 GPF for liquids and 1.28 GPF for solids, meets EPA WaterSense criteria, and uses a siphon jet rated MAP 1000g. The seat is a soft-close, quick-release PP unit with a one-button removal for cleaning. The skirted, seamless one-piece body keeps the exterior easy to wipe down.

The problem is what is missing at the highest price. No rough-in, no weight and no warranty are listed, and it is a slow seller. You are paying the most for a spec sheet thinner than the mid-priced HOROW's. In a remodel where the tall seat is the priority and you can confirm the rough-in directly, it fits. Otherwise the value is hard to defend.

Pros:

• Tallest ADA seat at 17.5"
• WaterSense dual flush per the listing
• Elongated skirted one-piece body
• One-button quick-release seat
• Siphon jet MAP 1000g claim

Cons:

• Most expensive pick here
• No rough-in, weight or warranty listed
• Slow seller of the group
• Thin spec sheet for the price

Will it fit your rough-in and floor space?

Before you add anything to a cart, measure two things. Get these wrong and the toilet either sits crooked or does not seat at all.

• Rough-in: the horizontal distance from the finished wall to the center of the drain bolts. The HOROW, both DeerValleys and the BayRoll all list 12". The HOROW also offers a 10" version, so match your floor to the right one.
• Depth clearance: how far the bowl projects from the wall. The DeerValley Compact is shallowest at 24.6" on its short side, the BayRoll runs 25.6", and the HOROW footprint is 26 x 26.6 x 15 in.
• Doorway and stairs: shipping weight ranges from 78 lb for the DeerValley Compact to 99.2 lb for the HOROW. That difference is real when you carry it up a staircase.

The two Casta Diva listings state no rough-in figure. That is not a dealbreaker if you message the seller and confirm 12" before ordering, but it is an extra step the other four save you. For a small powder room, the DeerValley Compact's short depth is the safest bet. For a standard bathroom, any of the 12" picks slots in.

How much cleaning does a skirted base save?

Every pick here except the HOROW is described as fully skirted, and it changes your weekly routine. A skirted toilet is one where a smooth panel covers the trapway, so the sculpted curves and hidden bolt caps that trap dust and grime are simply not there.

In practice, that means one wipe of a flat surface instead of a rag worked around the base. The DeerValley Compact, the DeerValley Elongated, the BayRoll and both Casta Diva models all use this design. The HOROW is a one-piece body without a full skirt, so it is still far easier to clean than a two-piece, but not quite as flat around the base.

Two picks add a rimless or open-rim bowl on top of the skirt. The DeerValley Elongated is described as rimless, meaning no hidden rim channel where mineral buildup hides. Combined with quick-release seats on most models, the skirted picks are the ones you spend the least time scrubbing. If cleaning is your top irritation, that points toward the DeerValley Elongated.

When a different pick wins

The HOROW is my default, but the right answer flips on a few clear conditions. Match yourself to one of these.

• If your bathroom is genuinely tiny, the DeerValley Compact wins on its 24.6" depth and 78 lb weight. The standard seat height is the trade you accept for the fit.
• If you want the lowest water use, the BayRoll's 0.9 GPF light flush is the lowest figure in the set, with the DeerValley Elongated close behind at 1 GPF.
• If a hands-free flush matters in a family bathroom, the Casta Diva Runner-up is the only pick with a foot-kick option.
• If the tall seat is everything, the Casta Diva premium and the DeerValley Elongated both list 17.5", the highest here.

The cutoff between the HOROW and the field is documentation. Above the line, where you want seat height, rough-in and warranty all in writing, the HOROW is alone. Below it, you trade paperwork for a specific feature.

The verdict

If you want one toilet that answers every fit question before a plumber arrives, buy the HOROW T0338W. It is the only pick that lists a 17.3" ADA seat, a 12" rough-in and a 1-year warranty together, and it offers a 10" rough-in version for older floors. That completeness is why it wins the best one piece toilet for homeowners.

If your bathroom is small, the DeerValley Compact is the better buy. Its 24.6" depth and 78 lb weight make it the easiest to fit and to carry, and it keeps the same 12" rough-in and 1-year warranty. The cutoff is seat height: the DeerValley runs standard height, so choose it only if nobody in the house needs the taller ADA seat.

The DeerValley Elongated is the water-saver's pick at 1 GPF with a rimless bowl, though it lists no warranty. The BayRoll wins on price with a 0.9 GPF flush. Both Casta Diva models bring tall seats and, in the Runner-up's case, a foot-kick flush, but they list no rough-in, which is the one number I never want to guess.

FAQ

Is a one piece toilet worth it for homeowners?

A one piece toilet is worth it for most homeowners because the seamless body between tank and bowl removes the crevice that traps grime on a two-piece. It weighs more to install, from 78 lb up to 99.2 lb across these picks, but there are fewer parts to leak over time and a cleaner profile that wipes down in one pass.

What is the best value one piece toilet in this set?

The best value here is the BayRoll, the cheapest of the six, which still lists a 17" ADA seat, a 12" rough-in and a 0.9 GPF light flush, the lowest water figure in the group. The DeerValley Elongated is a close second on value, adding a rimless bowl and a written 1 GPF flush at an entry-tier price.

What rough-in do these one piece toilets need?

The rough-in these one piece toilets need is 12" for the HOROW, both DeerValleys and the BayRoll, measured from the finished wall to the drain center. The HOROW also offers a 10" version. The two Casta Diva listings state no rough-in, so confirm it with the seller before ordering to avoid a toilet that will not seat flat.

HOROW T0338W or DeerValley Compact for a small bathroom?

For a small bathroom, the DeerValley Compact beats the HOROW T0338W on fit, at 24.6" depth and 78 lb versus the HOROW's larger footprint and 99.2 lb. But the HOROW lists a 17.3" ADA seat while the DeerValley is standard height. Choose the DeerValley for the tightest space, the HOROW if seat comfort ranks higher.

What mistake do buyers make with one piece toilets?

The mistake buyers make with one piece toilets is ordering before measuring the rough-in. That single number, 10" or 12" from the wall to the drain, decides whether the toilet sits flat. Two picks here list no rough-in at all, so guessing means an expensive return on a heavy fixture. Measure first, then match the toilet to the figure.

Start by measuring your rough-in and doorway width, then match those numbers to the picks that publish theirs. For most homeowners the HOROW T0338W is the safe default, since it is the only toilet here that spells out seat height, rough-in and warranty in one place, and its 10" version covers older floors the others cannot. When the fit numbers are documented, the install stops being a gamble, and that is worth more than any flush claim on the box.

Last updated: September 25, 2026. Product availability re-checked.

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