TOTO WASHLET S2 Review: Continuous Warm Water, One Control-Panel Catch

What you are actually buying

The S2's defining part is its heater: it runs on instantaneous heating that delivers a continuous warm-water stream lasting as long as you need — the one line that separates a TOTO from cheaper tank seats.

That matters because reservoir-tank seats cool after about a minute. The gauge below plots the S2's continuous behaviour against the run-cold pattern owners report on tank models.

Around that heater sits the standard TOTO feature set. The wand self-cleans automatically with EWATER+ inside and out, and PREMIST uses the incoming water supply to mist the toilet bowl before each use so waste is less likely to stick — two cleaning features that reduce how often you scrub. The SoftClose heated seat holds consistent warmth across the full seat surface, and an adjustable warm air dryer finishes the clean-up, though like every bidet dryer it is slow enough that most owners still pat dry with paper.

The cleansing stream on the TOTO WASHLET S2 offers pulsating and oscillating spray options. An air deodorizer neutralizes bathroom odors while you sit, and a built-in nightlight illuminates the bathroom with a soft glow for the 3 a.m. trip. In one housing the TOTO WASHLET S2 packs a water heater, an air heater, a heated seat, and a motorized spray wand. A side panel on the seat sets the personalized water cleansing settings, which keeps the count of wall-mounted parts at zero.

Where the S2 earns its price

Installation lands in the S2's favour. Setup only requires removing the old seat, cleaning the area, and fitting the new seat per instructions, and reviewers find the manual thorough, with nothing hard to understand or follow. TOTO points to 60 million WASHLET users and an easy DIY installation behind that.

The one piece of setup advice that repeats among TOTO S2 owners is to start gentle: try the lowest settings first to avoid being surprised by pressure or temperature.

"It's awesome and I'm mad at myself for not getting it sooner." — an S2 owner on r/bidets, echoing the most common arc in the reviews: skepticism about the price, then quick conversion once it is installed.

That arc shows up in the data. Owners found it intuitive to use and that it does a better job than they expected, and enthusiasts outnumber critics sharply in the review split. Day to day it sounds like a brief mechanical whir while it primes and self-cleans, which owners call mild rather than distracting. Over several weeks of ownership, that quiet routine is what tends to convert the early skeptics.

The built-in panel, the S2's most-debated feature, is also a quiet strength for some homes: a side-mounted control means no remote to lose and no extra holes to drill in the wall, which parents of small children single out as the reason they chose it. If the outlet and warm water are what you are after, our explainer on electric bidet seats covers what the power requirement buys you.

The control-panel catch

The TOTO S2's washing and heating draw almost no criticism — its controls draw nearly all of it. The complaints are specific: a bigger body can make the side controls difficult to access.

The same fixed placement creates more problems. The controls are on the right side, so for a left-handed user operation can be a pain; the side controls are in the splash zone, so there is more potential for grime to build up than there would be with a remote, which adds a wiping chore a remote-based seat avoids; and in homes with young children, if someone uses the side control to push up off the toilet, it can crack. None is a defect — each is the predictable cost of fixing the panel to one spot on the seat. The radar below scores the S2 across the five things owners judge, and the controls axis is the one that visibly dips.

One last honest note rather than a flaw: the TOTO S2 makes an audible sound while priming and self-cleaning, but owners call it not loud or distracting. None of this changes the wash quality — it changes who the S2 fits, which is the question the next section settles.

How it compares, and who should look elsewhere

The cleanest comparison is inside TOTO's own range. The S2 has the control built into the bidet seat while the S5 has a wireless remote, and the S5 has four user presets the S2 does not.

Both share the same instantaneous heater, so warm water is identical. The S2 is cheaper than the S5, the lack of a wireless remote the main difference — which is exactly what our TOTO WASHLET S2 vs S5 head-to-head walks through. If you are cross-shopping the tank-heated TOTO WASHLET TOTO C5 to save money, know that you trade away the continuous warm water that is the S2's whole point.

Outside TOTO, the retailer pattern is consistent. Across 16 shopping listings the S2 averages a 4.66 rating with all-positive sentiment; prices range widely only because bundles inflate the top end. Lowe's rates it 4.7 across 137 reviews, Wayfair lists the standalone S2 with a 4.4 rating across 48 reviews among the lowest seat-only prices, and the cheaper TOTO Washlet A2 — which drops the instantaneous heater — shows 204 reviews at 4.5 at Home Depot. Bundled with a Nexus one-piece toilet, the S2 package runs higher. It is a tight, positive band wherever it is sold. Shoppers who want a cheaper, simpler seat should compare Brondell bidet seats or the non-electric route in our how to choose a bidet seat guide; shoppers cross-shopping brands can read our take on Kohler bidet seats too. The S2 is the wrong pick if you need a left-friendly remote, saved presets, or a child-proof control surface — every one of those points to the S5.

Our verdict on the TOTO WASHLET S2

The S2 is the value entry to TOTO's instantaneous heating, and it earns a recommendation for one buyer: a right-handed household of average build that wants continuous warm water and a control it cannot misplace.

It is the right call for buyers who would rather not drill the wall or track down a remote, and the wrong seat for left-handed users, larger bodies, and homes where a child will lean on the panel. The S2 sits in the premium price tier; for those buyers the remote-based S5 solves the only real complaint it has.

Sources

• TOTO WASHLET S2 (model SW3346#01, Cotton White), Amazon product listing and owner reviews (ASIN B0FCTR1Y75). Accessed 2026-05-25.
• r/bidets — is the TOTO S2 better for its built-in remote? Accessed 2026-05-25.
• TOTO USA — WASHLET product line and specifications. Accessed 2026-05-25.