An Honest Review of TOTO Washlet S2 Electronic Bidet Toilet Seat Water Heating Functions
Why This Product Is Worth a Look
Electronic bidet toilet seats have become more common for users seeking consistent water-based cleaning and reduced reliance on paper. The TOTO WASHLET S2 SW3346#01 stands out due to its tankless water heating system and automated hygiene functions, which address some limitations found in earlier tank-based models.
Product Overview
The TOTO WASHLET S2 Electronic Bidet Toilet Seat model SW3346#01 is an elongated seat designed for standard elongated porcelain bowls in a Cotton White finish. It functions as a replacement seat that adds front and rear washing modes, a warm air dryer, an air deodorizer, and a heated seat. The unit operates from a side-mounted control panel and requires a 120V GFCI outlet within reach of its 3.9-foot power cord. Primary features include instantaneous water heating, PREMIST bowl misting, and EWATER+ wand cleaning.
Design, Build, and Everyday Feel
The seat measures approximately 21 inches long by 18.44 inches wide and weighs 16 pounds. Its profile is described as 19 percent slimmer than prior tank-equipped models, which reduces the rear bulk while still accommodating internal components. The body uses Clean Resin material on the seat and wand surfaces, creating a smooth, non-porous finish intended to limit grime accumulation. The underside lacks deep rim gaps, which simplifies wiping. The fixed right-side control arm adds width to the overall footprint. SoftClose hinges control lid and seat descent. An LED night light provides low-level bowl illumination.
Key Features
Instantaneous water heating uses a tankless module that warms water on demand rather than storing it in a reservoir. This setup supplies continuous warm water at three temperature settings and five pressure levels. The benefit is steady temperature during extended cycles, though the aerated stream produces lower maximum pressure than direct-line mechanical bidets.
PREMIST and EWATER+ work together for hygiene. PREMIST applies a fine water mist to the bowl interior before use to reduce waste adhesion. EWATER+ generates electrolyzed water to rinse the wand inside and out before and after each cycle. These functions lower the frequency of manual scrubbing, yet they do not eliminate the need for periodic cleaning of the unit and bowl.
The integrated air deodorizer draws air through an activated carbon filter during and shortly after use. It neutralizes odors at the source without additional chemicals. The warm air dryer offers three temperature settings but requires several minutes for full drying and can feel warm during prolonged operation.
The heated seat distributes warmth evenly across three temperature settings and pairs with an automatic energy saver mode that reduces power during idle periods. The side panel allows direct selection of wash modes, pressure, temperature, and dryer settings without a separate remote.
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What It May Be Like to Use
In typical daily use, the seat sensor activates upon sitting, triggering PREMIST and the deodorizer fan. Wash functions extend the wand and deliver aerated water that remains at the selected temperature. Users adjust position, pressure, and oscillation or pulsation patterns through the side panel. The night light activates in low light, and the dryer can be started after flushing. The seat slides off its mounting plate for access to the bowl during cleaning.
What Works Well
Continuous warm water eliminates the cooling that occurs when tank capacity is exceeded. The combination of PREMIST and a smooth seat underside reduces visible residue on the bowl over multiple days. The carbon filter deodorizer operates quietly and effectively in smaller spaces. The quick-release mounting plate allows the seat to be removed for thorough cleaning underneath. Energy saver mode automatically manages power draw during low-use periods.
Things to Consider
Maximum water pressure remains gentler than non-electric bidet attachments connected directly to household supply lines, which may require users to rely on oscillating patterns for thorough coverage. The side control arm increases lateral space requirements and cannot be relocated. The warm air dryer functions slowly compared with manual drying methods. No user memory profiles are provided, so wand position and settings must be adjusted manually for different users. Installation requires a dedicated GFCI outlet within 3.9 feet of the rear-left side of the bowl.
Who Is This Product For?
This seat suits individuals who prioritize steady warm water, automated bowl and wand cleaning, and a heated seat in a bathroom with an available GFCI outlet. It may appeal to those seeking reduced paper use or easier cleaning routines. It is less suitable for users who prefer high-pressure streams, wireless wall-mounted controls, or who lack space beside the toilet or access to a suitable electrical outlet.
Helpful Tips Before You Buy
Measure the distance from the rear-left side of the toilet to the nearest GFCI outlet before purchase. Confirm the toilet bowl is elongated, as the seat is shaped specifically for that geometry. During installation, wet the rubber mounting grommets slightly to ease insertion into the porcelain holes. Shut off the water supply and drain the tank before adding the brass T-connector. After connection, test all fittings with a dry paper towel to detect minor leaks. Avoid abrasive cleaners on the plastic surfaces.
Common Questions
Does the unit require a dedicated electrical outlet? Yes, it needs a standard 120V GFCI outlet within reach of the 3.9-foot cord.
How long does the warm air dryer take to work? It typically requires several minutes for complete drying and is intended as a supplemental step rather than a full replacement for paper.
Can the control panel be moved to the left side? No, the panel is fixed on the right side of the seat.
Is the water pressure adjustable? Five pressure levels are available, though the aerated stream remains gentler than direct-line mechanical bidets.
Does the seat remember settings for multiple users? No, it lacks separate user profiles, so manual readjustment is required between users.
Final Thoughts
The TOTO WASHLET S2 SW3346#01 offers continuous warm water through tankless heating, automated hygiene cycles via PREMIST and EWATER+, and a slimmer profile than earlier models. Its strengths center on temperature stability, reduced manual cleaning, and straightforward side-panel operation. Limitations include softer spray pressure, the fixed right-side control arm, and dependence on a nearby GFCI outlet. It fits users who value consistent warmth and hygiene features in a compatible bathroom layout, while those needing stronger water pressure or flexible controls may find other options more appropriate. Overall, the design reflects incremental engineering improvements focused on reliability and daily convenience.
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