TOTO Washlet S7 Electronic Bidet Toilet Seat

The S7 is fully auto-flush compatible, but it requires a separate mechanical hardware kit installed inside your toilet tank to work. To use this feature:

• Toilet Requirement: You must have a compatible TOTO WASHLET+ (T40) toilet model. Standard non-TOTO toilets or standard TOTO models without the T40 design cannot accommodate the auto-flush motor.

• The Kit: You will need to purchase the specific TOTO Auto Flush Kit (typically THU857 for single-flush or THU855 for dual-flush models) that matches your toilet's flushing system.

The only difference between these two models is automation.

• The "A" Factor: The "A" in S7A stands for Automatic. The S7A features a motion-activated lid that automatically opens as you approach the toilet and closes when you leave.

• The Standard S7: The standard S7 does not have a motion sensor; the lid must be opened and closed manually or via the remote control button. All other features—including the ultra-slim 4.06-inch profile, spray modes, and water heating—are completely identical.

• Sleeker, Flatter Profile: The S7 boasts an ultra-slim 4.06-inch frame with a silent skin-detection sensor, offering a flatter and roomier seating surface. The older S5 stands taller at 5.5 inches and uses a mechanical hinge sensor that makes a distinct "clicking" sound when you sit down.

• Premium Nozzle & Remote: The S7 upgrades to a telescoping nozzle that retracts entirely behind a protective door when not in use. It also features a high-gloss remote with dual infrared transmitters to eliminate signal dead zones, compared to the S5’s matte, single-transmitter remote.

• Dual-Zone Night Light: The S7 provides enhanced ambient lighting with illumination inside the bowl plus a secondary light strip along the side of the seat. The S5 features a single-zone light inside the bowl only.

Before purchasing, you must check the bowl shape of your existing toilet. TOTO bidet seats are designed specifically to match individual toilet configurations:

• Elongated vs. Round: Measure from the center of the two mounting holes to the very front tip of your toilet bowl. An Elongated bowl measures approximately 18.5 inches.

• WASHLET+ Compatibility: If you want a completely seamless look with hidden cords and hoses, ensure your toilet is a TOTO WASHLET+ (T40) model designed to conceal these connections.

Yes, TOTO electronic bidet seats require a standard, grounded electrical outlet to power the instantaneous water heater, heated seat, and air dryer:

• Power Requirements: You will need a GFCI outlet rated for 120V and 15 amps located within reach of the toilet.

• Cord Length: The integrated power cord is 4 feet long with a standard 3-prong plug.

• Circuit Protection: For safety and optimal performance, TOTO recommends plugging the seat into a dedicated circuit so it does not overload other bathroom electronics or lighting during use.

The difference is purely aesthetic, both models offer the exact same internal features, remote control, and cleansing performance. The choice comes down to which look best matches your bathroom design:

• Contemporary Design: Features a completely smooth, flat, minimalist lid with zero beveling or ridges. The lid wraps entirely over the seat ring for a uniform, clean look that blends seamlessly into modern, minimalist bathrooms.

• Classic Design: Features a subtle, traditional trim or molded ridge around the top edge of the lid. It adds a touch of classic architectural detail that pairs perfectly with traditional or transitional bathroom fixtures.