TOTO C5 vs S5 Washlet: Key Differences — Is the S5 Worth Switching To?

If you’re comparing TOTO C5 and TOTO S5 Washlets, this guide will help. Both models deliver reliable bidet functions, but there are notable differences in heating, profile, controls, and day‑to‑day convenience. Below we compare the main points so you can pick the best option for your bathroom.

Quick summary

• The C5 was a well‑rounded mid‑tier Washlet with a warm‑water reservoir, heated seat, PREMIST, and EWATER+.
• The S5 keeps those core features but adds a slimmer profile, on‑demand warm water, more user presets, and a refined remote design.
• The C5 elongated model has been discontinued; the C5 round may still be available through some sellers. The S5 is in current production and supported by the manufacturer.

Design & profile

Many users notice the physical difference first.

C5

• Traditional WASHLET shape with a visible water tank near the rear.
• Slightly taller profile that can be more noticeable on some toilets.

S5

• Tankless heater design allows a slimmer, lower profile.
• Blends more easily with modern toilet silhouettes and is simpler to clean around.

If appearance and a lower profile matter, the S5 is the cleaner fit.

Water heating

Both provide warm water for cleansing, but the method changes the experience.

C5

• Uses a reservoir-style heater (tank). Water is preheated and held warm.
• Warm water can be limited during long or repeated use.

S5

• Uses an instantaneous ceramic heater for continuous warm water on demand.
• No risk of running out of warm water mid‑use.

For households with frequent use or longer sessions, the S5’s system is more consistent.

Remote control & usability

Both models use a wireless remote, which many people prefer over attached control bars.

C5

• Functional wireless remote with a straightforward layout.

S5

• Slimmer remote with backlit buttons and a magnetic wall mount.
• Feels more modern and easier to read in low light.

Either remote will handle basic functions. The S5’s remote is designed for clearer usability.

User presets

Saved user settings matter when multiple people share a bathroom.

C5

• Supports 2 user presets.

S5

• Supports 4 user presets.

If you want more saved profiles for spray position, pressure, and temperature, the S5 provides broader flexibility.

Additional convenience features

The S5 adds small but useful refinements that affect daily use.

S5 notable additions

• Built‑in LED night light for low light conditions.
• Antimicrobial coating on the wand for added hygiene.
• Cleaner underside design that reduces dust build-up and simplifies cleaning.

These changes don’t change core wash performance but increase ease of use and maintenance.

Availability & support

• The TOTO C5 elongated model is discontinued; you may still find remaining stock or third‑party listings. The C5 round can show up as an online exclusive in some places.
• The S5 is part of TOTO’s current lineup and receives ongoing manufacturer support.

That matters for warranty, replacement parts, and long‑term software/firmware support.

Which model should you pick?

• Choose the S5 if you want continuous warm water, more user presets, a slimmer seat profile, and small conveniences like a night light and antimicrobial wand. The S5 is the better long‑term option and is actively supported by TOTO.
• Choose the C5 only if you find remaining stock at a strong price and are content with reservoir heating and fewer presets. Keep in mind elongated C5 stock is limited.