KOHLER San Souci Black Round Standard height 12-in Rough-In WaterSense 1.6 1-piece Toilet

Name: KOHLER San Souci Black Round Standard height 12-in Rough-In WaterSense 1.6 1-piece Toilet
Brand: KOHLER
SKU: 999942134
Rating: 4.4 (64 reviews)

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4.4

At a Glance

ADA Compliant

WaterSense Labeled

Round

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Is it ADA compliant?How much water does it use?What is the warranty period?Can I install it on my own?Does it include a toilet seat?

Manufacturer Color/Finish: Black

$1,382.47

Bowl Shape: Round

Compact elongated

Round

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With sleek curves and a low-profile silhouette, the San Souci one-piece toilet makes a strong design statement. A compact tank curves seamlessly into a round-front bowl for a space-saving profile. A 1.28-gallon flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5-gallon toilet, without sacrificing performance. This toilet comes with a soft-close seat featuring innovative technology that prevents the seat from slamming and simplifies both cleaning and installation.

One-piece toilets integrate the tank and bowl into a seamless, easy-to-clean design
Round-front bowl offers an ideal solution for smaller baths and powder rooms
Low-profile design
1.28 gallons per flush (GPF)
Standard left-hand trip lever included
Includes K-4009 Reveal Quiet-Close with Grip-Tight seat
Single-flush gravity uses the force of gravity and a precision-engineered tank, bowl, and trapway to create a strong siphon during flushing
AquaPiston canister allows water to flow into the bowl from all sides (360 degrees), increasing the power and effectiveness of the flush
Flush valve's 3:2 ratio harnesses the natural force of gravity and optimizes flush performance

General
Hardware Color Family	Black	Manufacturer Color/Finish	Black
Flush Technology	Gravity fed	Bowl Shape	Round
Toilet Seat Mounting	Top-mount	Flush Type	Single
Material	Vitreous china	Flush Lever Location	Left side
Type	1-piece	Outlet Location	Floor outlet
Collection Name	San Souci	Installation Type	Floor mounted
Color/Finish Family	Black

Dimensions
Trapway Size	2-1/8-in	Bowl Height	Standard height
Assembled Depth (Inches)	25.625	Bowl Height with Seat	17-in
Assembled Height (Inches)	24.25	Bowl Height without Seat	15-1/4-in
Assembled Width (Inches)	16.75	Rough-In Size	12-in
Assembled Weight (lbs.)	92

Features
Deodorizing	No	Portable	No
Corner Installation	No	Remote Control Included	No
Maximum Flush Rate	1.28 GPF (4.85 LPF)	High Efficiency	Yes
Rimless	No	Lined Tank	No
Seat Secure	Yes	Night Light	No
Bidet Function	No	Seat Included	Yes
Wax Ring Included	No	Slow Close Feature	No
Mounting Bolts Included	No	Lowe's Exclusive	No
Heated Seat	No	Gallons Per Flush	1.28
Rubber Bumpers Included	No	Supply Lines Included	No
Skirted	No	Toilet Kit	Yes
Self-Cleaning	No	Flush Lever Included	Yes

Compatibility
For Commercial Use	No	Smart Compatible	No

Warranty
Warranty	1-year limited

Certifications
CA Residents: Prop 65 Warning(s)	No	WaterSense Labeled	Yes
ADA Compliant	Yes

Miscellaneous
UNSPSC	30181500

Check out the Best Selling Toilets on Lowes.com

Review

4.4 out of 5

64 Reviews

3 Star

83% Recommend this product

Ratings may include incentivized customer reviews.

+ 2

What Customers Are Saying

Customers overwhelmingly praise the efficient flushing performance, highlighting single-flush reliability and quiet operation with reduced water usage. Many commend the compact, low-profile design perfect for small bathrooms, noting it maintains functionality without dominating space. The sleek, modern aesthetic with skirted base and smooth surfaces earns frequent compliments for easy cleaning. A small number report issues with the standard plastic seat or occasional long-term tank problems, though most still consider it a worthwhile investment despite minor drawbacks.

Customer review summary generated by AI, including incentivized reviews.

64 Customer Reviews

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Poor service

Would Recommend

I ordered this toilet online when we went to pick it up the lady who brought it told me I think it’s broken and opened the box and if it was broken but I don’t understand how those who are in charge of carrying the product can be so careless is a toilet of a thousand dollars and it didn’t even have a wrapper that protected it the worst thing is that if you order it is because it’s broken you need it and they waste your time because we cancel the order and buy it in Ferguson who are more professi...

AnonymousAugust 22, 2026
From San Souci White Compact elongated Chair height 12-in Rough-In WaterSense 1.6 1-piece Toilet

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Response from KOHLER Customer Service

Anonymous, this is Sarah with Kohler Customer Service. I am so sorry to hear about your experience at the store. I completely understand how disappoi... Read More

KOHLER Customer ServiceAugust 24, 2026

Had purchased one 2 years ago. Found it to be good and wanted the other bathroom to have same style toilet.

Big tall jimJuly 17, 2026
From San Souci White Compact elongated Chair height 12-in Rough-In WaterSense 1.6 1-piece Toilet Verified Purchaser

Was this Review Helpful ?

This replaced my old toilet and is very similar. Works good

North East OhioanJune 28, 2026
From San Souci Black Compact elongated Chair height 12-in Rough-In WaterSense 1.6 1-piece Toilet Verified Purchaser

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Great for small bathrooms

Very compact. Perfect for my very small bathroom. And the look of the one piece unit is very clean and modern.

KeikoJune 2, 2026

From kohler.com

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86a29obGVy/f5ad3ae2-2e49-5b4f-aa1f-8d09898aac04

Nice compact efficient toilet.

Would Not Recommend

Just installed it myself today. Was pretty straightforward. The flush seems powerful enough and the overall noise level seems pretty standard. The Kohler is a little more expensive than I might have wanted, but I am expecting a long and uneventful life.

Bucky33April 18, 2026
From San Souci White Round Standard height 12-in Rough-In WaterSense 1.6 1-piece Toilet Verified Purchaser

Was this Review Helpful ?

Would Recommend

Nice toilet with water saving feature. Nice clean look. Disappointed with toilet seat that came in the box. Toilet has a round bowl, but it came with an elongated toilet seat. It does not fit. Tried to return toilet seat and said they couldn't take it back, since it came that way from the factory.

TorijoFebruary 11, 2026
From San Souci White Round Standard height 12-in Rough-In WaterSense 1.6 1-piece Toilet Verified Purchaser

Was this Review Helpful ?

Perfect low-profile toilet

Great low profile toilet. We selected the round seat rather than the elongated version. This allows for more room in our bathroom. The lower back profile and the smaller seat keep the toilet from dominating the bathroom. Flushes great, quick refill, low noise. We bought one for each of our bathrooms and are very pleased.

SusanFebruary 10, 2026

From kohler.com

Just as described

Excellent product that fits in the designated space.

Happyhomeowner81December 30, 2025

From kohler.com

Sleek design

Good design and the dark grey color goes well with Matt black counter frames in the bathroom.

DiNovember 11, 2025

From kohler.com

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