Choosing between the Kohler PureWash E815 and the TOTO WASHLET S5 is one of the most interesting bidet seat matchups you can make right now.
Both offer remote control, heated seats, warm water, and air dryers — but they take very different approaches to getting you clean, and the right one for you comes down to what you actually value.
| Feature | Kohler PureWash E815 | TOTO WASHLET S5 |
|---|---|---|
| Image |  |
 |
| Dimensions (L x W x H) | 16.38″ x 15.69″ x 7.26″ | ~21″ x 15″ x 5.5″ |
| Water Heating | Tank heater | Instantaneous (endless) |
| Spray Modes | Stream, Mist, Air Mist (3-sided rotating wand) | Rear, Rear Soft, Front + Oscillating/Pulsating |
| Wand Cleaning | Auto stainless steel self-clean | EWATER+ electrolyzed water (inside & out) |
| Bowl Prep | None | PREMIST (pre-use bowl mist) |
| User Presets | 2 | 4 |
| Nightlight | No | Yes |
| Warranty | 3 years | 1 year |
| Buy Now |  |
 |
1. Kohler PureWash E815 Elongated Bidet Seat
Kohler is an American icon in bathroom design, and the PureWash E815 is the brand’s confident push into the feature-rich electric bidet seat space.
It brings a genuinely unique approach to cleansing — a three-sided rotating stainless steel wand that delivers three distinct spray modes — and backs it all up with a 3-year warranty that beats almost everything else at this price point.
Features
- Innovative 3-sided rotating wand with three cleansing modes: Stream, Mist, and Air Mist (Spa Spray)
- Front and rear wash with warm water from an onboard tank heater
- 3D wash feature oscillates the spray both back-and-forth and side-to-side
- Boost spray mode sets rear wash to maximum pressure instantly
- Child mode for a gentler, safer wash experience
- Two programmable user presets via handheld remote
- Adjustable heated seat with multiple temperature settings
- Warm air dryer with adjustable settings
- Quiet-Close lid and Quick-Release seat for easy cleaning
- 3-year limited warranty — longest in this comparison
Pros
- Unique rotating wand and Spa Spray mode you won’t find on most bidet seats
- Best-in-class 3-year warranty gives you real long-term peace of mind
- Child mode makes it genuinely family-friendly
- Trusted Kohler build quality with a sleek, polished aesthetic
Cons
- Tank-based water heater means warm water runs out after roughly 60 seconds of continuous use
- Only 2 user presets — not ideal for households with more than two regular users
- No nightlight or bowl PREMIST function
- Slightly taller profile at the back compared to the S5
The E815 is a standout pick if you want something distinctly different from the usual bidet experience — that rotating wand and Spa Spray mode are genuinely innovative, and Kohler’s 3-year warranty gives you confidence that goes beyond what TOTO offers at this tier.
Check its current price on Amazon
2. TOTO WASHLET S5 Electronic Bidet Seat (SW3446#01)
TOTO is the world’s most trusted name in bidet technology, and the WASHLET S5 is their current mid-range flagship — the direct, improved successor to the hugely popular C5.
If you’ve been exploring the world of bidet seats, you’ve probably already encountered TOTO’s reputation, and the S5 fully earns it. It was named a 2025 Wirecutter Top Pick, features endless warm water through instantaneous heating, and introduces a slimmer, easier-to-clean profile than its predecessor.
Features
- Instantaneous water heater for truly endless warm water — no tank, no waiting, no running cold
- PREMIST automatically mists the bowl before every use to prevent waste from sticking
- EWATER+ uses electrolyzed water to sanitize the wand inside and out before and after each use
- CLEAN RESIN coating on the wand and seat repels dirt and grime effortlessly
- Front and rear cleansing with oscillating and pulsating spray modes
- Built-in nightlight for easy late-night use without turning on harsh overhead lights
- 4 user memory presets — every household member can save their own settings
- Wall-mounted wireless remote with illuminated touchpad
- Auto energy-saver mode reduces seat temperature during periods of inactivity
- 19% slimmer profile than the previous C5 model
- SoftClose lid and seat, WASHLET+ compatible
Pros
- Endless warm water is a massive upgrade over tank-based systems — you’ll never wash cold mid-session
- PREMIST + EWATER+ + CLEAN RESIN is the most comprehensive hygiene system in this comparison
- 4 user presets make it ideal for families
- Named 2025 Wirecutter Top Pick — one of the most trusted endorsements in the category
- Slimmer profile is easier to sit on and visually cleaner
Cons
- Only 1-year warranty — shorter than the E815’s 3-year coverage
- No rotating wand or Spa Spray mode — wash experience is more traditional
- Remote is wall-mounted by design, which some users prefer but others find less flexible
The TOTO WASHLET S5 is the bidet seat that sets the benchmark for the mid-range category in 2025 and 2026. If you value clean technology, hygiene innovation, and proven reliability, this is the seat to beat — and the best comparison of how the S5 stacks up against other premium TOTO models is covered in our bidet comparisons hub.
Check its current price on Amazon
Head-to-Head: Kohler PureWash E815 vs TOTO WASHLET S5
Warm Water Performance
This is the biggest functional difference between these two seats, and it matters every single day.
The Kohler E815 uses a tank-based water heater, which means it heats a small reservoir of water before use.
That warm water feels great — right up until the tank empties after about 60 seconds of continuous spray, at which point the water turns cold.
The TOTO S5, by contrast, uses an instantaneous heater that generates warm water on demand.
There is no tank, no countdown, and no cold surprise mid-wash. If you run long, thorough cleansing sessions — or if multiple people use the toilet one after another — the S5’s endless warm water is a genuine advantage.
Winner: TOTO WASHLET S5 — instantaneous heating is simply superior for real-world daily use.
Cleansing Innovation & Spray Experience
This is where Kohler earns serious respect.
The E815’s rotating three-sided wand is unlike anything TOTO offers at this tier. The three modes — Stream, Mist, and Spa Spray (an air-infused mist that also adjusts water temperature automatically) — give you a genuinely varied cleansing experience. The 3D oscillation (both back-and-forth and side-to-side) is more dynamic than the TOTO’s oscillating/pulsating option. Add the Boost mode and Child mode, and the E815 is a more creatively designed product in this specific dimension.
The TOTO S5 offers front and rear wash with oscillating and pulsating streams, which covers the bases thoroughly — but it doesn’t match the E815’s variety.
If you’ve been exploring bidets with dryers and want the most interesting spray experience, Kohler surprises here.
Winner: Kohler PureWash E815 — the rotating wand and Spa Spray mode are genuinely creative and effective.
Hygiene & Bowl Cleanliness
TOTO’s approach to toilet hygiene is in a class of its own.
PREMIST wets the bowl surface before every single use, making it dramatically harder for waste to stick — which translates into a cleaner bowl with far less scrubbing over time. EWATER+ then sanitizes the wand with electrolyzed water before and after each use, and CLEAN RESIN on the wand and seat actively repels grime at a molecular level.
The Kohler E815 has a self-cleaning stainless steel wand — which is good — but it has no bowl prep system and no EWATER+.
For anyone prioritizing a consistently clean toilet, particularly if you’ve been comparing the best self-cleaning bidets, the TOTO system sets the standard.
Winner: TOTO WASHLET S5 — PREMIST + EWATER+ + CLEAN RESIN is the best hygiene package in this price range.
Comfort & Everyday Usability
Both seats offer a heated seat with adjustable temperature, warm air dryer, and wireless remote control.
The S5 pulls ahead with 4 user presets versus the E815’s 2, making it much better suited to families where multiple people have different preferences.
The S5 also includes a nightlight — extremely useful if you frequently get up in the middle of the night — whereas the E815 offers neither a nightlight nor a bowl mist.
On the other hand, the E815’s Quiet-Close lid and Quick-Release design make everyday cleaning slightly more convenient, and the handheld remote is flexible enough to use from any angle.
If you’re buying for seniors or users with limited mobility, the S5’s wall-mounted remote with 4 presets and illuminated touchpad has an edge.
Winner: TOTO WASHLET S5 — more presets, nightlight, and wall remote tip it ahead for daily household use.
Warranty & Value
The Kohler E815 carries a 3-year limited warranty — among the best you’ll find on any bidet seat at this price point.
The TOTO S5, despite being a premium product, comes with only a 1-year limited warranty.
If long-term ownership security is your priority, Kohler wins this category decisively.
Both seats represent good value, and both are strong performers in the context of all the best bidets for existing toilets — but the Kohler’s warranty gives you three times the coverage.
Winner: Kohler PureWash E815 — the 3-year warranty is a clear advantage.
Verdict: Which One Should You Buy?
Both seats are genuinely excellent, and neither is a bad choice. But they’re built for different buyers.
Buy the Kohler PureWash E815 if… you want a creative, feature-inventive bidet experience with the rotating wand and Spa Spray mode, you value the superior 3-year warranty, you’re a family with young children who’ll appreciate Child mode, or you simply prefer Kohler’s American design aesthetic and don’t do long continuous spray sessions.
Buy the TOTO WASHLET S5 if… you want endless warm water without any cold-water surprises, you want the best bowl hygiene system on the market (PREMIST + EWATER+), you have a family of three or more regular users who need individual presets, or you simply want the product that a 2025 Wirecutter Top Pick endorsement backs up.
For most buyers, the TOTO WASHLET S5 is the stronger all-around bidet seat. The endless warm water and PREMIST hygiene system alone make it worth the edge. But if Kohler’s rotating wand and 3-year warranty speak to your needs, the E815 will not disappoint you.
If you’re still deciding which style of cleansing makes sense for you, our bidet toilet seat comparison chart is a great place to broaden your research.
Frequently Asked Questions
Is the TOTO WASHLET S5 replacing the C5?
Yes. TOTO officially transitioned from the C5 to the S5 in 2025. The S5 is the direct successor — it brings instantaneous water heating (replacing the C5’s tank system), a slimmer profile, 4 user presets (up from 2), a nightlight, and a redesigned wall-cradle remote. If you were considering the C5, the S5 is simply the better and more current option. You can see how the two generations compared in our TOTO C series deep dive.
Does the Kohler PureWash E815 run out of warm water?
Yes — the E815 uses a tank-based heater, which means warm water is available for approximately 60 seconds of continuous spray before cooling. For most users doing quick cleansing sessions this is fine, but if you prefer longer or back-to-back washes, the TOTO S5’s instantaneous heater is the better solution. You can learn more about what to expect from bidets with warm water and dryers on our full guide.
Can both seats fit an existing toilet without a plumber?
Both the Kohler E815 and TOTO S5 are DIY-friendly bidet seats designed to replace your standard toilet seat in 30–60 minutes using the included hardware. You’ll need a GFCI electrical outlet near the toilet for both models. If your bathroom doesn’t have one nearby, an electrician would need to add one before installation. Our bidet toilet vs bidet seat guide walks through the installation considerations in more detail.
Which brand is better overall — Kohler or TOTO for bidet seats?
TOTO is widely regarded as the global leader in bidet seat technology, with decades of innovation that’s earned them the dominant market position worldwide. Kohler is America’s most respected plumbing brand and is producing increasingly competitive bidet seats like the E815. For pure bidet engineering and hygiene technology depth, TOTO leads — but for warranty coverage and creative spray design, Kohler holds its own. Our best bidet brands guide gives you a fuller picture of where each brand stands.
Conclusion
If you’ve made it this far, you know these two seats are both worth your attention — and the right choice really does come down to what matters most to you.
The Kohler PureWash E815 brings a uniquely creative spray system, a best-in-class 3-year warranty, and polished American design.
The TOTO WASHLET S5 brings endless warm water, the most comprehensive toilet hygiene system at this price point, 4 user presets, a nightlight, and a 2025 Wirecutter Top Pick endorsement.
For most households, the TOTO WASHLET S5 wins — but if you’ve always wanted a bidet seat that does something different with its wand technology, the Kohler E815 is a genuinely interesting alternative.
Either way, you’re upgrading your bathroom in a way you’ll feel the difference from day one. For even more options, check out our roundup of the best bidets for home use to see how these two seats compare to the wider field.
