Kohler Rialto Toilet with a french curve design

The Kohler Rialto is a low-boy style one piece toilet that has a “French curve” tank and a round bowl.  The “French curve” describes the front of the water tank which has a concave design and slopes down into the bowl as pictured.  While beautiful, the Kohler Rialto is very problematic for bidet seats.  The only bidet toilet seat currently that will fit the Kohler Rialto is the Blooming NB-R1063 and the ALPHA JX in the ROUND size.


Blooming NB-R1063 installed on a Kohler Rialto with over an inch protruding from the front of the toilet

Kohler Rialto Shape and Size

The combination of its French curve tank and short round bowl makes the Kohler Rialto a difficult toilet for bidet seats.  If you try to install a regular bidet seat, the first issue you will run into is the curved tank.  The Rialto’s French curve will not allow you to push the bidet seat all the way back against the tank.  As a result, bidet toilet seats cannot be mounted properly on their mounting brackets which require a flat bowl surface for installation.


Blooming NB-R1063 installed on a Kohler Rialto with over an inch protruding from the front of the toilet, side view

If you somehow manage to get a bidet seat mounted in the back, you’ll then find that the front of the seat hangs well over the front edge of the toilet bowl.  Due to its short round bowl, the Kohler Rialto simply does not offer enough surface area for regular bidet toilet seats to fit properly. 


Alpha JX with remote, top view

Blooming NB-R1063 & ALPHA JX

The Blooming NB-R1063 and ALPHA JX are the only bidet toilet seats currently on the market that are able to fit the Kohler Rialto and other French curve toilets with a round bowl.  The NB-R1063 is fully featured, including unlimited warm water, adjustable water pressures, and even an LED night light which illuminates the bowl in a dark restroom. 

The rear of the Blooming ALPHA are different from most bidet seats you’ll come across in that it has a compact, rounded rear.  Its rounded back is designed to allow the seat to slide farther back on the Kohler Rialto than other bidet seats which have larger, more pronounced, rear housings.


Blooming NB-R1063 with tape measure showing 1 and a half inches protruding from the front of the toilet.

The fitment on the Blooming NB-R1063 & ALPHA JX aren't exactly perfect.  A round Blooming & ALPHA installed onto a Kohler Rialto still has an overhang of about 1.5 inches.  Most other bidet seats would not even be able to mount onto the toilet.  However, the Blooming & ALPHA would still offer the best fitment for the Rialto if replacing the toilet is not an option.


diagram of a 1 Piece and 2 Piece Toilet

Other Options and Advice

Aside from the Blooming NB-R1063 and the ALPHA JX, there aren’t very many bidet seats that will fit properly.  However, it can often be more cost effective to replace the toilet altogether.  A new 2 piece elongated toilet can often be bought for less than $200.  With a plumber spending an hour to replace it, total costs would be around $250-300.  At this point, one could then buy any bidet seat on the market with all the desired features – instead of being limited to one model. 


If you have any questions about your particular toilet, check out our fitment guide and other helpful resources below.

Fitment Guide: Is My Toilet Compatible?

What Bidet Seats Fit a Kohler San Raphael Toilet?

Bidet Seat Installation Video

What is a Bidet Seat?