"TOTO toilet with bidet" is a search that splits into two distinct products: a TOTO toilet bowl with a TOTO Washlet seat (the modular path — buy a Drake bowl, add a Washlet seat later), or a TOTO Washlet+ integrated combo (pre-engineered as a unit — Drake bowl + Washlet S550e ships as one product). Both work; the modular path is cheaper and more flexible. Here's how to choose and what's involved in the install.
The two integration paths
Path 1: Modular — bowl + separate Washlet seat
Start with a TOTO bowl (Drake, Drake II, Vespin II, Aquia IV, UltraMax II are all Washlet-compatible). Add a TOTO Washlet seat to it. The seat clips onto the same bowl mounting bolts as a standard SoftClose seat. Total cost: $400 (bowl) + $700–$1,500 (Washlet seat) = $1,100–$1,900.
- Pros: Cheaper. You can upgrade later (start with a basic seat, add Washlet when budget allows). You can replace the Washlet without changing the bowl if technology changes.
- Cons: Two products to coordinate. The seat-bowl gap is slightly visible (vs the seamless look of an integrated combo).
Path 2: Pre-engineered Washlet+ Drake combo
TOTO sells the Drake II bowl + Washlet+ S550e seat as a single product ($2,400–$2,900). The Washlet+ designation means the seat is pre-tuned to the bowl's geometry — the spray nozzle hits the correct position, the auto-flush is calibrated to the Drake II's flush valve.
- Pros: Single SKU, single warranty, optimized fit. Looks slightly cleaner than the modular path.
- Cons: More expensive. Locked into the specific Drake-Washlet pairing.
Which TOTO Washlet seat to choose
| Washlet model | Price | Heated seat | Heated wash | Air dryer | Auto open/close lid | Best for |
|---|---|---|---|---|---|---|
| S550e Classic / Contemporary | $1,400–$1,700 | ✓ | ✓ (instant) | ✓ | ✓ | Premium home, master bath |
| S350e | $1,200 | ✓ | ✓ (instant) | ✓ | ✗ | Premium without auto-lid |
| C5 | $700 | ✓ | ✓ (tank-heated) | ✓ | ✗ | Mid-tier value |
| K300 | $650 | ✓ | ✓ (tank-heated) | ✗ | ✗ | Entry tier |
| A2 | $400 | ✓ | ✓ (tank-heated) | ✗ | ✗ | Budget |
| B100 | $320 | ✗ | ✓ (cold water!) | ✗ | ✗ | Cold-water-only — not recommended for cold-climate US |
TOTO bowls compatible with Washlet
Almost every current TOTO residential bowl accepts a Washlet seat. The bolt pattern and inside-bowl geometry are standardized. Confirmed compatible:
- Drake (elongated) — Washlet C5, K300, A2, S350e, S550e
- Drake II — Washlet C5, K300, S350e, S550e (Washlet+ version preferred for S550e)
- Vespin II — Washlet C5, K300, S350e, S550e
- Aquia IV — Washlet C5, K300, S350e (S550e fits but with slight overhang; verify before ordering)
- UltraMax II — Washlet C5, K300, S350e, S550e
- Eco Drake / Eco UltraMax — Washlet C5, K300, A2 (S550e and S350e may have height clearance issues — verify)
- Carlyle II — Washlet C5, K300 (S550e and S350e usually too tall for the low-silhouette Carlyle)
- Neorest series — no Washlet needed; integrated equivalent is built-in
The install requirements (the gotchas)
- GFCI outlet within 3 feet. The biggest install gotcha. Most US bathrooms don't have an outlet near the toilet. Adding one requires an electrician — $150–$450 depending on access.
- T-adapter on water supply line. The Washlet needs a water connection. A 3/8" compression-fit T-adapter installs between the angle stop and the tank fill — the T splits flow into two outputs: one continues to the tank, one feeds the Washlet wash. TOTO ships this T-adapter with the Washlet seat.
- Existing seat removal. Lift the seat bolt caps, unscrew, remove old seat. Washlet seat clips into a mounting bracket that bolts to the same bowl holes.
- Cord routing. The Washlet's power cord runs ~5 feet from the seat to the wall outlet. Plan where the cord will route — most installs have the outlet directly behind the toilet.
Third-party bidet seats that fit TOTO bowls
If you don't want a TOTO Washlet but still want bidet functionality on a TOTO bowl, several universal-fit electronic bidet seats work:
- Brondell Swash 1400 ($400–$580) — fits TOTO Drake II elongated. Comparable feature set to Washlet C5 at lower price.
- Bio Bidet BB-2000 Bliss ($480) — fits TOTO elongated bowls. Strong feature set; less polished UI than Washlet.
- Omigo Element+ ($380–$520) — direct-to-consumer alternative. Heated seat, wash, dryer.
- Kohler PureWash ($240–$520) — Kohler-branded universal-fit bidet seat. Fits TOTO bowls.
For a complete bidet category — including standalone bidet attachments and bidet-only fixtures — see our bidet category.
Why so many people search for this
The cluster "toto toilet with bidet," "bidet toilet seat for toto toilet," "toto toilet and washlet" — total ~10k monthly US searches — reflects a specific buyer journey: someone already owns or is buying a TOTO toilet, and they want to upgrade to bidet functionality. The TOTO + Washlet path is the cleanest answer because TOTO designs the Washlet seats specifically for TOTO bowl geometry. Third-party bidet seats fit but won't be as well-integrated.
Cost summary for the modular upgrade
- Existing TOTO toilet: already owned (or $400 for Drake elongated)
- TOTO Washlet C5 seat: $700
- T-adapter (included with Washlet): $0
- GFCI outlet (if not present): $150–$450 by electrician
- DIY install time: 30–60 minutes once GFCI is in place
- Total upgrade (existing bowl): $700–$1,150
- Total upgrade (new bowl + seat): $1,100–$1,600