TOTO WASHLET S5 Review: Honest Pros & Cons Worth Buying?

What Is the TOTO WASHLET S5?

The TOTO WASHLET S5 is an electronic bidet toilet seat designed to replace a standard toilet seat, offering advanced hygiene and comfort features. It is part of TOTO’s redesigned S series, combining instantaneous water heating, a heated seat, a warm air dryer, and a self-cleaning wand. The unit is intended for elongated toilets and aims to reduce reliance on toilet paper while providing a more thorough clean. It is suited for households seeking a high-end upgrade, individuals with mobility issues, or anyone interested in a more ecological bathroom routine.

This TOTO WASHLET S5 review will walk through its features, real-world usability, and overall value.

Key Features & Specifications

Feature	Details
Brand	TOTO
Model	SW3446#01
Color	Cotton White
Shape	Elongated (oval)
Material	Plastic
Water Heating	Instantaneous (endless warm water)
Seat Heating	SoftClose, heated with 5 temperature settings
Warm Air Dryer	5 temperature settings
Spray Options	Soft rear, rear cleanse, front cleanse; oscillating / pulsating
Deodorizer	Air deodorizer with filters
Self-Cleaning	EWATER+ system (electrolyzed water) cleans wand inside and out
PREMIST	Mists bowl before use to prevent waste sticking
Night Light	Built‑in illuminating light
Remote Control	Slim wireless remote with 4 user memory settings
Dimensions (L x W)	21 x 15.06 inches
Weight	13.5 pounds
Installation	DIY with included mounting hardware
Customer Rating	4.6 out of 5 stars (247 ratings)

The key innovation is the instantaneous water heater, which provides a continuous stream without the wait or temperature drop typical of tank‑based models. The EWATER+ system uses electrolysis to create a cleaning compound that sanitizes the wand, while PREMIST helps keep the bowl cleaner between uses.

What’s Included in the Box

The WASHLET S5 ships with everything needed for a standard installation:

• Electronic bidet seat unit
• Wireless remote control (with battery)
• Mounting plate and screws
• T‑valve adapter for water connection
• Flexible hose
• Instruction manual

No additional tools are required beyond a basic screwdriver and adjustable wrench, according to the manufacturer. The unit is designed to fit most elongated toilets, though users should verify their bowl dimensions.

How to Use

Setup

Installation involves removing the existing toilet seat, attaching the mounting plate, and connecting the water supply using the included T‑valve. The unit then clicks into place. The remote requires two AAA batteries (not included). TOTO provides clear, step‑by‑step instructions, and many users report completing the process in under 30 minutes.

Operation

After setup, the WASHLET S5 is controlled by a slim wireless remote. Buttons are clearly labeled for rear cleanse, front cleanse (for feminine hygiene), spray position adjustment, water temperature, seat temperature, dryer, and deodorizer. The oscillating and pulsating modes can be toggled for a customized experience. Four user memory settings let different people save their preferences.

Maintenance

The wand self‑cleans with EWATER+ before and after each use. The deodorizer filter should be replaced periodically (typically every 6‑12 months). The exterior can be wiped with a damp cloth. The manufacturer recommends using a mild, non‑abrasive cleaner.

Troubleshooting

If the unit does not power on, check the electrical connection and GFCI outlet. For weak water flow, ensure the water supply valve is fully open. The remote may need fresh batteries if it stops responding. TOTO’s customer support is well‑regarded for addressing more complex issues.

Performance & User Experience

TOTO is a well‑known Japanese brand with decades of experience in sanitary ware. The WASHLET S5 builds on that reputation with reliable components. Based on user feedback and technical specifications, the instantaneous water heater eliminates the “cold blast” that can occur with tank‑based units after warm water runs out. The heated seat with five settings provides consistent warmth, and the warm air dryer is effective but may take a minute or two to fully dry.

The PREMIST feature sprays a fine mist of water on the bowl before use, which helps waste slide off more easily. This reduces scrubbing and keeps the bowl cleaner. The EWATER+ self‑cleaning system adds peace of mind by sanitizing the wand without harsh chemicals.

User reviews on Amazon (4.6 stars, 247 ratings) frequently praise the comfort, ease of use, and reduction in toilet paper usage. Some note that the seat design is slightly smaller than older models, and the plastic material feels durable but not premium.

Pros and Cons

Pros

• Endless warm water with instantaneous heating
• Heated seat and warm air dryer with multiple temperature levels
• Self‑cleaning wand and PREMIST bowl misting
• Quiet operation and air deodorizer effectively reduces odors
• Wireless remote with four user memory settings
• Easy DIY installation

Cons

• Plastic construction may feel less premium than some bidet seats
• No automatic open/close lid (open/close is manual)
• Remote requires two AAA batteries (not included)
• Some users find the seat shape slightly narrower than standard

Comparison With Alternatives

The bidet seat market includes several competitors. Here are three common alternatives:

• TOTO WASHLET C5 – A more affordable model with a tank‑based water heater (limited warm water duration) but similar seat heating and spray functions. No PREMIST or EWATER+.
• Bio Bidet BB‑2000 – Offers instantaneous heating, adjustable spray, heated seat, and a warm air dryer. Includes a remote with preset options. Slightly more expensive but with a sleeker design.
• Kohler PureTide – Another heated bidet seat with wireless remote and self‑cleaning wand. May lack the PREMIST feature found on TOTO.

The S5 stands out for its PREMIST and EWATER+ combination, which are unique to TOTO’s higher‑end models. If you prioritize maximum water‑saving and self‑cleaning technology, the S5 is a strong contender.

Who Should Buy This Product?

The TOTO WASHLET S5 is ideal for:

• Homeowners looking to upgrade their bathroom with modern hygiene technology
• Individuals with limited mobility, arthritis, or post‑surgery recovery who benefit from hands‑free cleaning
• Eco‑conscious users aiming to reduce toilet paper consumption
• Families where multiple people use the same toilet (thanks to memory settings)

It may not be the best fit for:

• Those with a very tight budget (higher upfront cost than basic models)
• Users who want automatic lid opening/closing (not available on the S5)
• Round‑toilet owners (the S5 is elongated only)

Expert Tips

• Measure your toilet’s mounting hole spacing (typically 5.5 inches) and bowl length before purchasing. The S5 fits elongated bowls only.
• Use included T‑valve and avoid using Teflon tape unless specified; the supplied adapter seals properly.
• After installation, run a few flush cycles to check for leaks and to prime the EWATER+ system.
• Set the seat temperature to a comfortable level (medium settings work for most). Higher settings use more electricity but are cozy in winter.
• Replace the deodorizer filter annually to maintain air quality.

Common Mistakes

1. Not checking electrical outlet proximity – The S5 requires a grounded outlet within 3 feet of the toilet. Many bathrooms lack an outlet; an electrician may be needed.
2. Skipping the water shut‑off – Always turn off the water supply before disconnecting the old seat.
3. Overtightening plastic connections – Hand‑tighten plus a quarter turn with a wrench is sufficient; over‑tightening can crack fittings.
4. Using harsh cleaners – Abrasives or bleach can damage the plastic and the EWATER+ system. Stick to mild soap and water.
5. Ignoring the remote battery compartment – Insert batteries correctly to avoid remote failure.

Where to Buy

The TOTO WASHLET S5 is widely available through major online retailers. We recommend purchasing from an authorized seller to ensure warranty coverage and genuine product.

Final Verdict

The TOTO WASHLET S5 is a well‑rounded electric bidet seat that delivers on comfort, hygiene, and convenience. Its instantaneous water heater, heated seat, and self‑cleaning technology address common pain points in daily bathroom routines. While the plastic build and lack of an auto‑lid may deter some, the overall package offers strong performance for its category.

If you are looking for a reliable bidet seat that reduces toilet paper usage and provides a refreshing clean, the S5 is a solid investment. For those interested in a more detailed breakdown, our TOTO WASHLET S5 review and rating covers additional considerations.

FAQ

1. Does the TOTO WASHLET S5 work with round toilets?

No, the S5 is designed exclusively for elongated toilet bowls. Round bowls will not fit properly.

2. How does EWATER+ work?

EWATER+ uses electrolysis to convert tap water into a mild cleaning compound that sanitizes the wand and nozzle without chemicals.

3. Is the seat heated all the time?

The seat heater has five temperature settings and can be turned off if desired. It operates only when the unit is powered on.

4. Can I adjust the water pressure?

Yes, water pressure and spray position are adjustable via the remote control.

5. Does the remote require a wall mount?

The remote includes a small stand or bracket; you can place it on a vanity or mount it on the wall using adhesive strips (not included).

6. How long does the warm air dryer take?

Typically 1–3 minutes, depending on the selected temperature and airflow. Patting dry slightly with a small amount of toilet paper speeds the process.

7. Is the installation truly DIY?

Most users with basic tools can install it in under 30 minutes. However, if you lack an electrical outlet near the toilet, you may need a licensed electrician.

8. What is the warranty?

TOTO offers a limited one‑year warranty on parts and labor. Check with the retailer for details.

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