A web-verified look at the HOROW T0338W compact one-piece toilet, its ADA seat height, short projection, dual flush, and MaP 1000 rating for tight bathrooms.
The HOROW T0338W is a compact one-piece toilet with 17.3 inch ADA seat height and a short 26.6 inch projection. It scores MaP 1000 on the full 1.6 GPF flush and uses dual flushing, but it is not WaterSense certified because the full flush exceeds 1.28 gallons.
The HOROW T0338W tries to solve two problems at once. It wants to fit a small bathroom without crowding the room, and it wants to sit tall enough for easy standing. We compared its manufacturer specs against the certified numbers on popular one-piece rivals to see where it earns a place and where buyers give something up. This review sticks to verified figures only, so every spec below comes from HOROW listings or independent flush data.
The T0338W is a one-piece elongated toilet built around a compact skirted shell. Manufacturer specs list an overall footprint of 26.6 inches deep, 15 inches wide, and 26 inches tall. The seat sits at 17.3 inches, which HOROW markets as ADA chair height. It ships with a soft close seat, a quick release hinge, side covers that hide the mounting hardware, and a wax ring and bolt kit in the box. HOROW lists a 12 inch rough-in as standard, with a separate 10 inch rough-in model sold under the T0338W10 name.
The one-piece body matters more than it sounds. There is no gap between tank and bowl to trap grime, so the skirted sides wipe down in one pass. Owners report the seamless shape is the main reason they chose it over a cheaper two-piece unit.
The headline number is a MaP score of 1000 grams, the top of the scale. That rating is measured on the full 1.6 gallon flush and reflects bulk waste clearance under an independent load test, not marketing claims. If you want the full picture of how that test loads a bowl with soybean paste and paper, our explainer on what a MaP score means walks through the grading scale.
HOROW uses a siphon flush fed through a fully glazed 2 inch trapway. The wider glazed channel is what lets solids leave in one cycle, and it is the same mechanical idea behind most strong flushers. If you are new to the siphon action that pulls waste through the bowl, our guide on how toilets work covers the trap and refill cycle in plain terms.
The dual flush gives you 1.1 gallons for liquids and 1.6 gallons for solids. That split saves water on the frequent small flushes while keeping full power in reserve. The catch is the full flush volume, and it deserves its own section.
WaterSense requires a maximum flush of 1.28 gallons or less. The T0338W tops out at 1.6 gallons on the full flush, so it does not carry the WaterSense label, and HOROW does not claim it. That does not make it wasteful in daily use, since the 1.1 gallon reduced flush handles most trips, but it does matter in states that mandate 1.28 gallon fixtures. California, Colorado, Texas, and several others restrict new installations to WaterSense volumes, so confirm your local code before buying.
The tradeoff is worth understanding rather than fearing. A 1.6 gallon flush moves more water per cycle, which is part of why the MaP score reaches 1000. Our comparison of 1.28 GPF versus 1.6 GPF breaks down when the extra volume helps and when it simply costs you water on the utility bill.
The T0338W earns its title on two measurements. The 17.3 inch seat height falls inside the ADA comfort range of 17 to 19 inches, which reduces the drop and lift for taller adults, older users, and anyone with knee or hip strain. Standard bowls sit closer to 15 inches, so the difference is noticeable on every use.
The second number is the 26.6 inch depth. Many elongated one-piece toilets project 28 to 31 inches from the wall, which eats into a small bathroom or blocks a swinging door. At 26.6 inches, the T0338W keeps an elongated bowl while pulling the front closer to the wall. That short projection is the reason it suits powder rooms, tight en suites, and homes where a full elongated unit would crowd the walkway. You keep the roomier elongated seat without the usual floor penalty.
We lined the T0338W up against four well known models using only verified flush data. The table below focuses on the numbers that decide a purchase, water volume, MaP clearance, WaterSense status, and flush technology.
| Model | Full flush GPF | MaP score | WaterSense | Flush technology |
|---|---|---|---|---|
| HOROW T0338W | 1.6 (1.1 partial) | 1000 | No | Dual flush siphon |
| TOTO Drake II | 1.28 | 1000 | Yes | Tornado Flush |
| Kohler Highline | 1.28 | 1000 | Yes | Class Five |
| Swiss Madison St. Tropez | 1.28 (0.8 partial) | 600 | Yes | Dual flush |
| American Standard Champion 4 | 1.6 | 1000 | No | Single flush |
The pattern is clear. On raw flush power the T0338W matches the best, tying the TOTO Drake II, the Kohler Highline, and the American Standard Champion 4 at the MaP 1000 ceiling. It clears more per flush than the Swiss Madison St. Tropez, which independent data lists at MaP 600. Where the T0338W falls behind is efficiency. Both the Drake II and the Highline reach the same 1000 gram clearance at 1.28 gallons and carry WaterSense, while the T0338W needs 1.6 gallons to get there. It shares that 1.6 gallon full flush with the plain Champion 4, which is also not WaterSense certified.
The upside is that the T0338W offers something none of those four combine, a MaP 1000 flush with a genuinely compact 26.6 inch body and ADA seat height in a one-piece skirted shell. You are buying the footprint and the height as much as the flush.
The 12 inch rough-in is the most common spacing in modern homes, measured from the finished wall to the center of the drain bolts. Owners with an older 10 inch rough-in should order the T0338W10 instead, since forcing the wrong rough-in leaves an ugly gap or a bowl that will not seat. HOROW includes the wax ring and bolts, and the skirted design means you seal the base and clip the side covers rather than reaching around a contoured trap. The soft close seat and quick release hinge lift off for cleaning without tools. HOROW lists a limited warranty on the ceramic body, so register the purchase and keep the receipt.
This toilet fits a specific buyer. If your bathroom is tight and you still want an elongated bowl at comfort height, the 26.6 inch depth and 17.3 inch seat are the whole point. It suits aging in place, guest baths behind a swinging door, and remodels where every inch of floor counts. The MaP 1000 flush means you are not trading power for size.
Skip it if water efficiency or local code is your priority. Buyers in WaterSense mandated states, or anyone chasing the lowest possible bill, will do better with a 1.28 gallon model that still reaches MaP 1000, such as the TOTO Drake II or the Kohler Highline. If you are weighing several finalists across price and performance, our roundup of the best flushing toilets puts the compact and full-size options side by side.
Ready to check availability and current pricing on the compact ADA model? Check current price.
The seat sits at 17.3 inches, which falls inside the ADA comfort range of 17 to 19 inches, and HOROW markets it as ADA chair height. That taller seat reduces the drop and lift on every use, which helps taller adults and anyone with limited mobility.
It is a dual flush toilet, using 1.1 gallons for the reduced flush and 1.6 gallons for the full flush. The MaP 1000 clearance is measured on the 1.6 gallon setting.
WaterSense caps the maximum flush at 1.28 gallons. The T0338W full flush uses 1.6 gallons, so it exceeds the limit and does not carry the label. The 1.1 gallon reduced flush still saves water on most trips, but the fixture may not meet code in states that require 1.28 gallon toilets.
Manufacturer specs list a footprint of 26.6 inches deep by 15 inches wide, shorter than many elongated one-piece toilets that project 28 to 31 inches. That compact depth is the main reason it suits powder rooms and tight layouts while keeping an elongated bowl.
The standard T0338W uses a 12 inch rough-in, measured from the finished wall to the center of the drain bolts. HOROW sells a separate 10 inch rough-in version as the T0338W10, and the two are not interchangeable, so measure before ordering.
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