TOTO's New Washlet Lineup: S2, S5, and S7: Features, Benefits, and How They Compare to the Previous Generation

If you're upgrading to a bidet seat, TOTO's latest Washlet S2, S5, and S7 make the choice easier than ever. TOTO's 2025 lineup is the clearest it's been in years. The new WASHLET S2 and WASHLET S5 refresh the wildly popular C-series, and the WASHLET S7 stands as TOTO's premium seat (with S7A as the auto-open/close variant). Below is a plain-English guide covering what has changed, who each model is intended for, and how they compare to the outgoing C2/C5 and S500e/S550e models.

TL;DR

• S2: Core TOTO features, side-panel controls, instant/continuous warm water, and entry price. Ideal first WASHLET.
• S5: Adds wireless remote, four user presets, night light, seamless seat, and instant/continuous warm water. The new mid-range standard.
• S7: Premium seat with EWATER+ on wand & bowl, manual Ewater bowl-mist button, power deodorizer, advanced fine-tuning; choose S7A if you want auto open/close.
• Compared to C2/C5: The most significant shift is from tanked to instantaneous heaters (no more running out of warm water), plus sleeker designs and upgraded controls.

Model-by-model overview

WASHLET S2 (entry – simple, dependable) 

• What you get: warm water cleansing with adjustable position/pressure, heated seat, warm air dryer, deodorizer, PREMIST, EWATER+ wand cleaning, and instantaneous heating for continuous warm water—controlled from a built-in side panel. Available in elongated and round.
• Best for: value-focused buyers, rentals, and multi-unit projects that want TOTO reliability without a handheld remote. 

WASHLET S5 (mainstream – most people's sweet spot) 

• What you get (on top of S2): wireless remote (wall-mountable), up to 4 user presets, night light, and a seamless seat design that avoids grime-catching gaps—still with instant/continuous warm water.
• Best for: households that want easier controls, saved settings for multiple users, and a cleaner seat design.

WASHLET S7 (premium – maximum comfort & control) 

• What you get: all core features plus EWATER+ auto-cleaning on wand & bowl, a manual Ewater bowl-mist button, a high-output power deodorizer, fine-tunable behaviors (lid timing, power-save schedules, LED "night mode"), and a slim profile. Choose S7A if you want auto open/close lid/seat.
• Best for: premium remodels and accessibility-minded installs (pick S7A for true hands-free convenience). 

Shop the models:

• S2 (elongated) – SW3346#01
• S2 (round) – SW3345#01
• S5 (elongated) – SW3446#01
• S5 (round) – SW3445#01
• S7 (elongated/contemporary) – SW4726AT40#01
• S7 (elongated/classic) - SW4724AT40#01
• S7 (round/contemporary) - SW4725#01
• S7A (elongated/contemporary) – SW4736AT40#01
• S7A (elongated/classic) – SW4734AT40#01
• S7A (round/contemporary) – SW4735#01 

What's new versus the previous generation?

C-series → S-series (C2/C5 vs S2/S5)

• Endless warm water: S2/S5 move to instantaneous heaters, so you don't run out mid-wash (C2/C5's tank heaters typically did after ~30–60 seconds).
• Controls & usability: S2 keeps the side panel feel from C2, while S5 upgrades to a remote with presets (C5 had a remote but without the S5's newer interface and profile).
• Design details: S5's seamless seat and lighting make cleaning and night-time use easier.
• Availability: TOTO is actively transitioning dealers from C2/C5 to S2/S5 in 2025.

S500e/S550e → S7/S7A (premium)

• Lid styles & fit: S7/S7A introduced updated contemporary/classic lids for better bowl matching and a sleeker look vs S500e/S550e.
• New functions: Manual Ewater bowl mist and power deodorizer are S7/S7A standouts not present on the older e-series.
• Hands-free option: S7A adds auto open/close; S7 does not. 

At-a-glance comparison

Installation & compatibility notes (for planners)

• Measure the bowl (round vs elongated) and ensure ~2 in. clearance from tank face to mounting-hole center for most new WASHLETs.
• Want hidden cords/hoses? Look for WASHLET+ compatible toilets for the integrated, clean look. 

FAQs

• Do the new S2 and S5 really have unlimited warm water?
  Yes, both use instantaneous heaters. That's the main upgrade over C2/C5's tank heaters, which typically ran warm for only ~30–60 seconds.
• Is S5 worth it over S2?
  If you value a wall-mounted remote, 4 user presets, and a night light, the S5 is the easy pick; cleansing performance stays excellent on both.
• Is the S5 actually replacing the C5? Should I still buy a C5?
  TOTO is transitioning from C5 to S5 in 2025. If pricing is close, S5's continuous warm water, remote with presets, and updated design make it the safer long-term pick.
• Side panel vs remote – does it matter? (S2 vs S5)
  Functionally both clean well. If you want wall-mounted controls and multi-user presets, go S5. If you prefer no extra device, S2's side panel is simpler and reliable.
• S7 vs S7A – what's the difference?
  Same cleansing performance. S7A adds auto open/close (sensor and remote-controlled); S7 does not. Choose S7A if hands-free matters for convenience or accessibility.
• Is the deodorizer a gimmick?
  Users report that TOTO's deodorizer works when filters are clean; some seats also let you boost it (power deodorizer on S7/S7A). Filters do need maintenance over time.
• Is auto open/close worth it?
  Many owners love it, especially on premium installs or for mobility needs. You can always disable it if it triggers too often in tight spaces.
• Does S2 have a handheld remote?
  No. S2 uses a side-arm control panel by design. If you want a remote, step up to S5.
• Will these fit my toilet?
  Most standard North American bowls are fine, but always check bowl length/shape and tank clearance. For the cleanest look, pair with a WASHLET+ compatible toilet.
• Will S7A's auto features work on any toilet?
  Auto open/close works anywhere, but Auto-Flush requires a compatible TOTO WASHLET+ toilet and the separate auto-flush kit.

Which one should you choose?

• Budget/simple: S2 (dependable, continuous warm water, side-panel controls)
• Best overall: S5 (remote, presets, continuous warm water, night light)
• Premium: S7 or S7A if you want auto open/close (EWATER+ for wand & bowl, manual Ewater mist, power deodorizer)

Bath4All can help you match the right Washlet to your toilet model (including round/elongated and WASHLET+ pairings), and coordinate multi-unit orders for builders and property managers.