TOTO WASHLET S2 VS TOTO WASHLET S5
- Dec 29, 2025
- 2 min read
Updated: Jan 4

Overview
This article compares the TOTO WASHLET S2 BIDET SEAT and the TOTO WASHLET S5 BIDET SEAT by outlining shared features and key differences. The comparison focuses strictly on design, specifications, and functionality.
Shared Features
Both models are bidet seats designed to be installed on existing toilets rather than fully integrated smart toilets. Each uses instant water heating technology, providing continuous warm water without the use of a storage tank.
Both include adjustable front and rear cleansing with customizable spray position and water pressure. Heated seats with adjustable temperature settings are standard on both models, along with built-in warm air dryers.
For hygiene, both bidet seats use PREMIST®, which applies a light mist to the toilet bowl before use to help reduce waste adhesion. Both also include EWATER+® TECHNOLOGY, which automatically cleans the spray wand after use.
Bidet cleansing functions and control operation is included with both models, allowing users to adjust settings to their personal preference. Each model also incorporates features to reduce electricity usage when not actively in use.
Seat Shape and Compatibility
The TOTO WASHLET S2 BIDET SEAT is available for both Round- and Elongated-shape toilet bowls. WASHLET S2 Model SW3345#01 is designed for a round-shaped toilet bowl, while the SW3346#01 is for Elongated (#01 = Cotton White color). The Sedona Beige color WASHLET S2 Model SW3346#12 (#12 = Sedona Beige color) is only available for Elongated-shape toilet bowls.
The TOTO WASHLET S5 BIDET SEAT is available for both Round- and Elongated-shape toilet bowls. WASHLET S5 Model SW3445#01 is designed to fit round-shaped bowls, while Model SW3446#01 is for Elongated (#01 = Cotton White color). The Sedona Beige color WASHLET S5 Model SW3446#12 (#12 = Sedona Beige color) is only available for Elongated-shape toilet bowls.
Because round and elongated toilet bowls differ in size and shape, please measure and reference the fitment guide image shown with each product (a Round-shape bowl measures approximately 16.5" from the seat mounting bolts to the front edge of the bowl, while an Elongated-shape bowl will measure approximately 18.5").
Key Differences Summary
The only difference between the TOTO WASHLET S2 and TOTO WASHLET S5: the S2 has side-mounted bidet seat controls while the S5 offers a convenient wall-mountable Remote Control.
