Do They Make Smart Toilets With a 10-Inch Rough-In?
Yes, they make smart toilets with a 10-inch rough-in, and TOTO is the reason this collection exists. Rough-in is the distance from the finished wall to the center of the closet bolts that hold the toilet to the floor. Twelve inches is the standard size today; 10-inch rough-ins usually turn up in older homes and powder rooms, and 14-inch is normally the result of a remodel. A 10-inch bathroom does not limit you to a basic bowl. It limits you to the series that offer the size, and TOTO offers it on a long list of them.
TOTO gets to 10 inches two different ways
The first way is the Unifit rough-in adapter. TOTO offers three Unifit lengths for select skirted models, which is how one bowl covers 10-inch, 12-inch, and 14-inch bathrooms. The adapter is fitted during installation, is bought separately from the toilet, and the part numbers are specific to each series, so a Aquia IV adapter will not fit a Carlyle II. On the Aquia IV the 10-inch part is the TSU48.10. Aimes, Legato, Aurora, Carolina II, Vespin II, Redington, Glaston, Soiree, and Guinevere work the same way.
The second way is a separate toilet. The Drake and Drake Transitional have no adapter. TOTO builds a distinct 10-inch version of certain models instead, marked with .10 in the model number, such as the Drake WASHLET+ S7A in MW7764736CEFGA.10. That toilet fits a 10-inch rough-in only. It will not sit correctly on a standard 12-inch drain, so the model number matters more here than on any other page in the store.
What the smart part of the toilet does
A smart toilet adds bidet washing, a heated seat, a warm-air dryer, a deodorizer, and a night light to the fixture itself rather than to a seat you bolt on afterward. On TOTO's WASHLET+ sets the power cord and water supply hose are concealed inside the design, so there is no cord looping around the base. Every WASHLET tier in this collection includes EWATER+, which electrolyzes water to produce a sterilizing agent that keeps the wand and bowl hygienic, and PREMIST, which wets the bowl surface before use and aids in the removal of waste. The S7A adds an auto open and close lid, and auto flush is available as an upgrade on several models.
The bowls carry the same engineering as the rest of the line. The 10-inch Drake uses TORNADO FLUSH at 1.28 GPF with CEFIONTECT glaze; the Aquia IV is a dual-flush 1.28 and 0.9 GPF bowl with DYNAMAX TORNADO FLUSH and the same glaze. Full smart toilets run from about $1,000 to $5,000 or more and a well-maintained one lasts 10 to 15 years or more. Narrow by budget in bidet toilets $1,000 to $2,000 or luxury bidet toilets over $2,000.
How to Choose a 10-Inch Rough-In Smart Toilet
Choosing here is a four-step job: confirm the rough-in you actually have, decide whether you need an adapter model or a .10 model, pick the bowl shape and seat height, then pick the WASHLET tier. The first step is the one that costs money when it is skipped.
Do You Need a 10-Inch or a 12-Inch Rough-In?
You need whichever one your bathroom already has, and you find out by measuring, not guessing. Find the bolt caps where the toilet meets the floor and measure from the finished wall behind the tank to the center of those bolts. Measure to the wall itself, not the baseboard, and if the toilet has four bolts use the back pair. You do not need to pull the toilet to do it. Anything within half an inch of 10, 12, or 14 is your size. If you get 11 or 13, you almost certainly measured to the baseboard, and if the reading really is 11 inches, order the 10-inch model: a toilet can sit farther from the wall than its rough-in, but never closer. The full method is in our toilet rough-in size guide, and if you measure 14 inches, shop 14-inch rough-in toilets instead.
Can You Replace a 10-Inch Rough-In Toilet With a 12-Inch Toilet?
You usually should not replace a 10-inch rough-in toilet with a 12-inch toilet, because the new fixture has to sit about two inches farther out from the wall to line up with the drain. A toilet can sit farther from the wall than its rough-in but never closer, so it is not always impossible, only awkward: you get a visible gap behind the tank, and a skirted design with a concealed supply connection often will not clear the trim at all. The clean fix is to buy the version made for your bathroom, either a skirted model with the 10-inch Unifit rough-in ordered alongside it, or a Drake .10. Going the other direction is worse; a .10 model on a 12-inch drain will not seat correctly.
Pick the bowl shape and the seat height
Measure from the center of the seat bolts to the front edge of the ceramic: about 16.5 inches is a round bowl, about 18.5 inches is elongated. Elongated is more supportive and gives you the widest choice of models, and it reaches two inches farther into the room, which matters in the small bathrooms 10-inch rough-ins tend to live in. Compare both in our elongated versus round bowl guide, or browse elongated smart toilets and bidets for small bathrooms. Height is the second call. TOTO's Universal Height puts the seat about 17 to 19 inches from the floor against roughly 15 inches for standard height, it meets the ADA seat height, and TOTO marks it with an F in the model number. On the Drake range the 10-inch rough-in is only offered on certain Universal Height models, so that choice is partly made for you. See tall toilets and ADA compliant bidets and toilets.
Pick the WASHLET tier
The tiers differ in controls and automation, not in whether you get a bidet. S2 and S5 sets cover the core: heated seat, warm water, warm-air dryer, deodorizer, night light, EWATER+, PREMIST, and a self-cleaning wand. S7 adds finer adjustment and a remote, and S7A adds the auto open and close lid. Decide which two or three of those you would genuinely miss, then pick the lowest tier that includes them.