Is the TOTO WASHLET S1 a good bidet seat?

Yes, the TOTO WASHLET S1 is an exceptional entry-level electronic bidet seat that brings TOTO’s trusted reliability and continuous tankless water heating to an accessible price point. Users appreciate its endless warm water supply, hygienic CLEAN RESIN® construction, and simple, built-in side arm controls.

What is the main difference between the TOTO S1 and TOTO KS2?

The primary difference is that the WASHLET KS2 includes an integrated bowl night light and a warm air drying system, whereas the WASHLET S1 focuses purely on essential warm water washing and seat heating capabilities without a dryer or night light.

What is the difference between SKU SW2325#01 and SKU SW2326#01?

SKU SW2325#01 is the Round version designed to fit standard round-front toilet bowls, while SKU SW2326#01 is the Elongated version designed for longer, elongated toilet bowls. Both models feature identical heating, cleaning, and control features.

TOTO WASHLET S1 Bidet Seat

TOTO WASHLET S1 Quick-Feature Breakdown

Instantaneous Water Heating: High-efficiency tankless heating coil warms water on demand, delivering continuous warm water for endless wash cycles
CLEAN RESIN® Coating: Advanced molecular surface repels water spots, waste, and dirt to keep the seat and wand cleaner longer
Seamless Seat: Custom-molded shell removes dirty gaps along the underside of the seat ring for effortless wipe-down care
Attached Arm Control: Convenient, built-in side panel keeps wash settings and feature buttons accessible right at your side
SoftClose® Lid: Integrated damper hinges ensure the seat and lid close softly and quietly every time
Auto Energy Saver: Smart power system scales back seat heating when inactive to lower overall electricity consumption
Self-Cleaning Wand: Automatic freshwater rinse cleans the spray wand inside and out before and after every single use

TOTO WASHLET S1 Bidet Seat - elongated open lid

TOTO WASHLET S1 Bidet Seat - instant warm water

Continuous Instantaneous Warm Water

Equipped with an advanced tankless water heater, the WASHLET S1 heats water instantly as it flows through the unit. Unlike traditional tank-type bidets that run out of warm water after 30 seconds, this system supplies continuous, uninterrupted warm water for as long as you need it.

TOTO WASHLET S1 Bidet Seat - clean resin technology

Advanced CLEAN RESIN® Hygiene

TOTO’s proprietary CLEAN RESIN® technology features hydrophobic and stain-repelling properties across the seat and spray wand. This specialized barrier prevents dirt, waste, and mineral buildup from sticking, making routine maintenance quick and easy.

TOTO WASHLET S1 Bidet Seat - elongated top view

Seamless Easy-Clean Seat

Standard electronic bidets often feature a physical seam along the underside of the seat ring where moisture and grime collect. The S1 features a completely seamless seat design that removes this gap, ensuring a smoother, more hygienic surface that wipes clean in seconds.

TOTO WASHLET S1 Bidet Seat - Elongated right side view

Convenient Side Panel Operation

The integrated side arm control panel puts full command of your wash settings right at your fingertips. From adjusting spray temperature and pressure to configuring seat warmth, all controls are straightforward and easily accessible without searching for a separate remote.

TOTO WASHLET S1 Bidet Seat - Round (SW2325#01) & Elongated (SW2326#01)

The TOTO WASHLET S1 combines modern Japanese luxury, energy efficiency, and instantaneous water heating technology in an accessible, streamlined design for both round and elongated toilets. Powered by a tankless heating system, the S1 delivers continuous warm water cleansing without running cold. Its hygienic CLEAN RESIN® construction naturally repels dirt and grime, while a seamless seat design removes the traditional gap where waste usually collects.

Controlled via an intuitive attached side arm control panel, it offers essential luxury features like a heated seat and customizable spray modes for reliable daily comfort.

Perfect for homeowners seeking an essential, high-tech electronic bidet seat with continuous warm water, side-panel controls, and easy-clean materials available for both round and elongated toilet bowl shapes.

TOTO WASHLET S1 Specifications and Features

Electronic bidet seat
Self-cleaning wand cleans itself inside and out before and after every use
CLEAN RESIN® keeps wand and seat cleaner, more hygienic, and effortless to maintain
Gentle aerated, warm water, front and rear spray with oscillating and pulsating features
Adjustable spray position, water temperature, and water pressure
Instantaneous water heater for continuous warm water and energy savings
Convenient arm control panel
Heated seat with temperature control
Seamless seat design eliminates the gap where dirt collects
SoftClose® seat
Docking station for easy cleaning and installation
Auto energy-saver mode adjusts the seat temperature when inactive
Compatible with most toilets

TOTO WASHLET S1 Compatibility

The TOTO WASHLET S1 is available in two distinct sizing options: Round (SW2325#01) and Elongated (SW2326#01). Confirm these four things before ordering.

Toilet bowl shape: Match the model SKU to your toilet shape. Select SW2325#01 for Round toilets or SW2326#01 for Elongated toilets to ensure an exact fit without rim overhang.
Toilet tank clearance: Requires approximately 1.5 to 2 inches of flat clearance between the seat mounting holes and the front face of the toilet tank.
Electrical hookup: Requires a standard 120V GFCI electrical outlet located within reach of the power cord (typically on the wall beside or behind the toilet).
Water line access: Connects directly to your toilet's standard fresh water shutoff valve using the included T-connector and flexible supply hose.

For reference: Utilizing an intuitive quick-release docking station, the TOTO S1 easily mounts onto your existing toilet bowl in under an hour with standard tools.

Installation steps

Turn off the water supply valve behind the toilet and flush the toilet to empty the tank completely.
Remove your existing toilet seat and thoroughly clean the porcelain surface around the mounting holes.
Position the quick-release catch plate over the bowl mounting holes and secure it using the provided mounting bolts.
Slide the WASHLET S1 seat backward onto the catch plate until it locks securely into place with a click.
Disconnect the flexible water line from the bottom of your toilet tank fill valve.
Thread the included T-connector onto the tank fill valve, then reattach your main supply line to the bottom port.
Connect the WASHLET water feed hose to the side branch of the T-connector and slowly turn on the main water valve to check for leaks.
Plug the power cord into a nearby GFCI outlet and test the wash functions using the attached arm control panel.

TOTO WASHLET S1 Downloads

TOTO WASHLET S1 Manual

TOTO WASHLET S1 Installation Manual

TOTO WASHLET S1 Spec Sheet Round

TOTO WASHLET S1 Spec Sheet Elongated

Yes, the TOTO WASHLET S1 is an exceptional entry-level electronic bidet seat that brings TOTO’s trusted reliability and continuous tankless water heating to an accessible price point. Users appreciate its endless warm water supply, hygienic CLEAN RESIN® construction, and simple, built-in side arm controls.
The primary difference is that the WASHLET KS2 includes an integrated bowl night light and a warm air drying system, whereas the WASHLET S1 focuses purely on essential warm water washing and seat heating capabilities without a dryer or night light.
SKU SW2325#01 is the Round version designed to fit standard round-front toilet bowls, while SKU SW2326#01 is the Elongated version designed for longer, elongated toilet bowls. Both models feature identical heating, cleaning, and control features.