TOTO S5 vs C5: The Bidet Seat Upgrade You Need

The TOTO Washlet C5 has been a reliable mid-range favorite for years, but 2025 marks a turning point: the new WASHLET S5 is replacing the Washlet C5.

The TOTO S5 goes a step further than the TOTO C5, offering not only advanced hygiene features, but also a slimmer, more eco-conscious design that uses less energy and fewer materials.

So what's the difference between the new TOTO S5 vs C5?

Below you’ll find a concise side-by-side, a full feature rundown for the TOTO S5 Washlet, and a deeper look at why the upgrade matters for everyday homeowners as well as bidet enthusiasts.

Grab Your TOTO S5 Washlet

TOTO S5 Washlet Full Feature List

• Instantaneous ceramic water heater for limitless warm-water cleansing
• Dual-action front & rear wash with oscillating and pulsating spray patterns
• Five water-pressure levels and five temperature options
• Self-cleaning wand with EWATER+ pre-/post-rinse & CLEAN RESIN antimicrobial finish
• PREMIST bowl spray to stop waste from sticking
• Heated SoftClose seat (five temp levels)
• Warm-air dryer (three temps) and automatic air deodorizer
• Ultra-slim wireless remote; stores four user profiles; magnetic wall dock
• White LED night-light (inside bowl) for safe midnight visits
• Seamless seat underside; quick-release docking station for tool-free removal
• Auto energy-saver mode and programmable idle timers
• Available in elongated and round styles; fits most two-piece and many one-piece toilets

Why the S5 Is Better For You

1. Streamlined, Modern Design

At first glance you notice the thinner silhouette with the S5 trimmings 19% off the vertical height, hiding plumbing in a sleeker shell that hugs the bowl line. That means a less bulky look and less surface for dust to collect.

Underneath, TOTO removed the traditional seam, creating a smooth underside that wipes clean in seconds, a small but welcome quality-of-life change for anyone who scrubs around the seat bolts.

2. Endless Warm Water Without the Tank

The C5 seats rely on a one-pint reservoir kept at ~100 °F all day. Once that water is used, a cool surge follows until the heater recovers. The S5’s tank-less ceramic heater flashes water to temperature in milliseconds, so every family member gets a full, warm wash...no pauses, no shivers.

Because it only draws power when you press Wash, TOTO’s in-house testing shows a 38% reduction in standby energy, despite the higher peak wattage.

3. Better Hygiene from Wand to Bowl

Both seats mist the bowl and rinse the nozzle with EWATER+, but the S5 layers on CLEAN RESIN, an antimicrobial surface infused into the wand and seat. It actively resists bio-film, so you spend less time descaling and more time enjoying that just-installed freshness.

4. Comfort Features That Feel Premium

You’ll still find the heated seat, warm-air dryer, and deodorizer veterans love, yet the S5 subtly upgrades each:

• Dryer airflow is boosted to 8.83 ft³/min at the same 140 °F max, trimming dry-time
• Night-light casts a soft bowl glow, guiding sleepy users without blinding overheads
• Energy saver drops seat temperature automatically when the bathroom sits idle, an elegant nod to the rising cost of electricity

5. Smarter, More Intuitive Remote

TOTO C5 owners know the original slim remote: functional, but each new visitor must re-dial every setting. The Washlet S5’s re-engineered handset stores four distinct profiles, remembering temperature, pressure, and nozzle position.

Tap your icon and you're done. Haptic-feedback buttons, a scroll-wheel layout, and a magnetic cradle round out the UX facelift.

6. Eco-Conscious Inside and Out

Beyond lower daily watt-hours, the TOTO S5 uses fewer raw materials in its housing thanks to the trimmed profile. That translates to less plastic produced, lighter shipping weight, and ultimately a smaller carbon footprint—details that resonate with sustainably minded homeowners striving to cut both paper and power.

7. Installation & Compatibility Remain Simple

Worried that “S-Series” means professional install? Don’t be. The TOTO S5 remote control mounts on the same quick-release dock as the TOTO C5, uses a standard 120 V GFCI outlet, and works with most elongated or round toilets. 

If you swapped a C-Series before, you already have every tool you need.

Final Thoughts on the new TOTO S5 Washlet

TOTO rebuilt its flagship mid-premium seat around a slimmer profile, smarter hygiene tech, and modern comforts like a night-light and profile memory.

If you’ve been eyeing the TOTO C5 or if your current unit is nearing retirement, the TOTO Washlet S5 is the logical, future-proof upgrade that slots into the same bathroom footprint while delivering a noticeably richer cleansing experience.

Ready to experience the difference? Be among the first to upgrade to the all-new TOTO WASHLET S5.

Grab Your TOTO S5 Bidet Seat