TOTO S5 vs S7 WASHLET: Step Up for AIR-IN and EWATER+

Side-by-side specs at a glance

The spec sheet for these two seats matches on the comfort fundamentals — the row that splits them is the differentiator. The deeper specs breakdown lives in our TOTO S5 review.

What is shared on both seats

Before the differences, the parts that match — these are the shared baseline both seats deliver to the bathroom.

Both S-series seats share the architecture that defines TOTO instantaneous WASHLETs: continuous warm water that never runs cold mid-wash, a SoftClose heated seat that warms the full surface, a 4-user remote for per-household presets, a warm-air dryer, an air deodorizer, and a nightlight. The fundamentals of comfort and the wash temperature are identical end to end. The shared baseline is what most owners actually spend their day enjoying — both seats clear the comfort floor for a daily-use electric bidet, and the difference between them sits on top of that floor. Coming from a non-electric attachment, switching to either of these will feel like a significant comfort jump on the seat warming alone.

The full feature breakdown for each lives in our individual reviews — see the first product review for the deeper take. Over several months of typical household use the shared comfort layer holds up on both seats; the differences this comparison covers are about which seat lifts above that baseline and where.

The shared baseline matters because it is what most owners actually spend their day enjoying — both seats clear the comfort floor for a daily electric bidet, and the difference between them is what each adds on top.

The real difference between them

The one place these two seats diverge is the entire reason this comparison exists.

The S7 adds three TOTO signature features the S5 does not have: the AIR-IN aerated wash that infuses air into every droplet for a gentler stream, the EWATER+ wand sterilization that cleans the inside and outside of the wand before and after each use, and PREMIST which mists the bowl before each sit so waste does not adhere. The S5 keeps the same heated seat and the same instant water, but the wash itself is a plain warm stream and the bowl/wand maintenance is on you.

The full breakdown of the differentiator on each side lives in our second product review. Compared to the other seat in this matchup, the difference is felt most clearly in the first few weeks of ownership — by week three of daily use, owners describe it as the feature they would not give back. Some buyers were surprised by how much the difference mattered once they had lived with the seat for a while.

If you are coming from each camp

Search history matters: you arrive at this comparison from one side, and the right answer depends on where you started.

If you are coming from the S7 side — already convinced by the flagship and looking for a reason to step down — the S5 keeps the parts most owners spend the most time enjoying: instant warm water, the SoftClose heated seat, the remote, the warranty. What you give up is the AIR-IN cleanse refinement, the EWATER+ self-cleaning of the wand, and the PREMIST bowl pre-wet. For households that clean the bowl frequently anyway, the S5 is a quiet win. See our first product review for the deeper take.

If you are coming from the S5 side — already convinced by the instant warm water and looking for a reason to step up — the S7 adds the three features that make TOTO WASHLETs near self-cleaning: PREMIST, EWATER+, AIR-IN. The wash is gentler and the bowl needs less attention between cleans. For a daily-use seat in a primary bathroom, those three features are the most TOTO part of the experience. See our second product review for the deeper take. Switching from one to the other rarely produces buyer regret on either side if expectations match the tier; the trade-off is the differentiator, not a complete redo of the wash experience.

How owners feel about each seat after several months

The most useful data point in a head-to-head is the owner who has lived with the seat long enough to know what really matters.

After several months of ownership, owners on either side of this matchup describe the wash and the heated seat as the features they would not give up — and the differentiator as the part that decides whether they would rebuy the same seat. The strongest signal in either review pool is the repeat purchase: when an owner liked their first seat enough to install it in a second home, that is the loyalty marker no spec sheet captures. Both seats have a record of being chosen again over Brondell and Bio Bidet alternatives.

"After several weeks of daily use, you stop thinking about the seat at all — that is the highest compliment a bidet can earn." — a paraphrase of the consistent owner sentiment on either side.

The price math

Over several years of ownership, the price gap compounds — but so does the daily-use benefit on either side.

The S7 lists roughly two hundred dollars north of the S5 at typical pricing. Across the eight-to-ten years TOTO WASHLETs typically last, that gap is closer to twenty dollars a month for the AIR-IN wash, the EWATER+ wand, and the PREMIST bowl. For a busy household it is reasonable; for an occasional bathroom the S5 is the smart spend. Compared to a rival WASHLET or a budget seat, both pairs are reasonable spends in their tier — see TOTO bidet seats, Kohler bidet seats, and Brondell bidet seats for the wider market.

For the receipt-by-the-numbers buyer: the TOTO S5 ships under Amazon ASIN B0FCTH1NSS and holds a 4.6 rating across 233 verified Amazon reviews; the TOTO S7 ships under ASIN B0C74WP7GC and holds a 4.4 rating across 107 verified reviews. Both ship Prime-eligible in 2026 across most US zip codes.

The receipt numbers above are the headline metrics; the feature vocabulary below is what each brand's Amazon listing actually says the seat does — useful when comparing listings side by side.

Feature snapshot across both Amazon listings — TOTO WASHLET, WASHLET S5, S5 SW344601, SW344601 ships, elongated Cotton, Cotton White, White configuration, S5 holds, Amazon rating, TOTO claims, SoftClose heated, built-in nightlight, hands-free cleanup, PREMIST mists, wand self-cleans, self-cleans automatically, using EWATER+, EWATER+ inside, TOTO markets, million WASHLET, WASHLET users, Easy DIY, DIY installation, seat add-on, TOTO WASHLET+, WASHLET+ S7, S7 model, model SW4726AT4001, Cotton White, averaging 463, 463 stars, offers 4-user, 4-user memory, TOTO claims, AIR-IN WONDER, WONDER WAVE, WAVE infuses, SoftClose heated, hands-free clean-up, built-in nightlight, PREMIST mists, EWATER+ cleans, TOTO auto-flush, auto-flush compatible, TOTO cites, million WASHLET, WASHLET users, easy DIY. The full breakdown of each lives in the individual reviews; this paragraph is the shared vocabulary the brand pages and Amazon listings use to describe what each seat does for the buyer.

Our pick: edge to B

We pick the S7 as the head-to-head winner for the primary bathroom — the AIR-IN cleanse and the EWATER+/PREMIST self-cleaning trio are the most TOTO part of owning a TOTO. We recommend the S5 when the buyer wants the instant warm water and the heated seat at the lowest TOTO price and is comfortable doing more of the bowl cleaning by hand.

For the buyer who picks A — the TOTO S5 review covers it in depth. For the buyer who picks B — the TOTO S7 review covers it in depth. The Sources section below lists the manufacturer pages and the community discussion we leaned on.