The Kohler San Souci K-5172-0 is a premium one-piece compact elongated toilet that blends a smaller footprint with a taller comfort-height seating position. Its concealed trapway gives the base a cleaner appearance and simplifies wipe-down maintenance, while the 1.28 GPF AquaPiston flush keeps water use low. Because the seat is not included, buyers have more flexibility to choose a matching seat or specialty upgrade.
What rough-in does the San Souci K-5172-0 require?
This model uses a standard 12-inch rough-in. You should measure from the finished wall to the center of the closet bolts before ordering, especially because one-piece concealed-base toilets do not leave much room for installation surprises. Confirming that dimension upfront prevents most fit issues.
How good is the AquaPiston flush on this compact elongated toilet?
The AquaPiston system is designed to provide strong, full-canister water delivery into the bowl while staying at 1.28 gallons per flush. That helps the toilet remain efficient without leaning on an unusually small or weak flush profile. For a compact elongated one-piece model, it is positioned as a balance of footprint, appearance, and dependable residential flushing.
Can I use an aftermarket seat since this toilet does not include one?
Yes. In fact, this model is a good candidate for buyers who already have a preferred seat style, including some upgraded slow-close or bidet-seat options. The key is making sure the seat is compatible with Kohler's compact elongated bowl geometry rather than assuming all elongated seats fit the same. Checking the seat manufacturer's compatibility list is the safest approach.
What is the advantage of Comfort Height on a compact elongated bowl?
Comfort Height raises the seating position to a more chair-like level, which many adults find easier to use every day. That is useful when you want the legroom benefit of a compact elongated bowl without giving up accessibility-oriented ergonomics. It can be a particularly smart choice in smaller bathrooms that still serve as full-time daily-use spaces.
Is the K-5172-0 a water-saving and WaterSense-certified toilet?
Yes. At 1.28 GPF, it uses less water than older 1.6 GPF toilets while still being designed as a full-performance gravity-flush model. Under your rules, all 1.28 GPF toilets here are flagged as WaterSense certified. That makes this a premium-format toilet with mainstream efficiency credentials.
# Kohler San Souci Comfort Height One-Piece Compact Elongated Toilet **Model:** `K-5172-0` **Brand:** Kohler **Category:** Toilet > The Kohler San Souci K-5172-0 is a premium one-piece compact elongated toilet that blends a smaller footprint with a taller comfort-height seating position. Its concealed trapway gives the base a cleaner appearance and simplifies wipe-down maintenance, while the 1.28 GPF AquaPiston flush keeps water use low. Because the seat is not included, buyers have more flexibility to choose a matching seat or specialty upgrade. ## Specifications | Attribute | Value | |---|---| | Product Type | one-piece | | Bowl Shape | compact elongated | | Gpf | 1.28 | | Flush Technology | AquaPiston | | Height Type | comfort-height | | Seat Height In | 17.5 | | Trip Lever | left-hand | | Trapway | concealed | | Rough In In | 12 | | Seat Included | No | | Color Finish | White | | Water Sense Certified | Yes | | Warranty | Limited Lifetime | ## What's Included - One-piece toilet - Left-hand trip lever - Mounting hardware Source: https://www.jaspecs.com/kohler/toilet/k-5172-0-kohler-san-souci-comfort-height-one-piece-compact-elongated-toilet/