Choosing between the Kohler PureWash E815 and E930 is one of the most common dilemmas you’ll face when upgrading to a premium bidet seat.
Both belong to Kohler’s trusted PureWash lineup, but they serve very different buyers — and this breakdown will help you figure out exactly which one fits your bathroom and lifestyle.
| Feature | Kohler PureWash E815 | Kohler PureWash E930 |
|---|---|---|
| Image |  |
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| Dimensions (L × W × H) | 21¼” × 15-11/16″ × 6-11/16″ | 19-5/8″ × 15-1/16″ × 3-9/16″ |
| Water Heating | Tank-type heater | Continuous/inline heater |
| Spray Modes | Stream, Mist, Air Mist (3D wash) | Oscillating & Pulsating spray |
| Wand Self-Cleaning | Auto rinse before & after use | UV light auto-sanitization every 24 hrs |
| Motion-Activated Lid | No | Yes |
| Nightlight | No | Yes |
| Smart Home / App Control | No | Yes (Kohler Konnect + Alexa/Google) |
| Buy Now |  |
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1. Kohler PureWash E815 Elongated Bidet Toilet Seat
The Kohler PureWash E815 — formerly known as the C3-325 — is Kohler’s mid-range electric bidet seat that packs a surprising number of premium features into a clean, understated design.
If you’re stepping up from a basic seat or exploring your first electric bidet, the E815 is a natural fit with its intuitive remote and approachable feature set that won’t overwhelm you.
Features
- Three-sided rotating stainless steel wand with three spray modes: Stream, Mist, and Air Mist
- 3D wash feature that oscillates the spray both back-and-forth and side-to-side for thorough coverage
- Spa Spray mode that combines air mist with automatic temperature adjustment
- Boost spray that sets rear wash to maximum pressure at the touch of a button
- Wand is automatically rinsed before and after every use
- Five heated seat temperature settings
- Warm-air dryer included
- Child mode with soft, gentle wash for safer use by kids
- Handheld remote with two programmable user presets
- Quiet-Close lid and Quick-Release hinges for easy removal and cleaning
Pros
- Unique rotating wand with three spray modes is a differentiator in this price range
- 3D wash and Spa Spray features go beyond what most competitors offer at a similar tier
- Child mode makes it family-friendly right out of the box
- Very easy to install — most users complete setup in under 30 minutes
- Kohler build quality is consistently reliable and long-lasting
Cons
- Tank-type water heater means hot water can run out during extended use
- No nightlight — can be inconvenient for nighttime visits
- No motion-activated lid or smart home connectivity
- Slightly bulkier profile compared to the E930
The E815 is the sweet spot for anyone who wants real advanced functionality — particularly those rotating spray modes — without paying for smart home bells and whistles they may never use.
If you want to compare it to other top performers, check out our bidet toilet seat comparison chart to see how it stacks up across the category.
Check its current price on Amazon
2. Kohler PureWash E930 Elongated Bidet Toilet Seat
The Kohler PureWash E930 is Kohler’s slimmest and most advanced bidet seat — and it’s designed for buyers who want their bathroom to feel like a luxury experience, not just a functional upgrade.
With a profile so low it’s almost indistinguishable from a standard toilet seat, plus motion-activated lid and full smart home integration, the E930 is built to impress.
Features
- Continuous inline water heater — never runs out of warm water, no matter how long you use it
- Motion-activated, hands-free opening and closing of the lid
- Bowl mist feature that automatically pre-mists the bowl before use for more effective rinsing
- Self-cleaning stainless steel wand with UV light sanitization every 24 hours
- Oscillating and pulsating spray options
- Built-in nightlight for bowl illumination
- Heated seat with adjustable temperature settings
- Warm-air dryer
- Child mode with soft, gentle wash
- Boost spray for maximum rear wash pressure
- Kohler Konnect app compatible — control and personalize from your phone
- Works with Amazon Alexa and Google Home for voice control
- Handheld remote with two programmable user presets
Pros
- Continuous hot water means you never get a cold surprise mid-wash
- Kohler’s slimmest bidet seat — the ultra-low profile is genuinely stunning in person
- UV wand sanitization every 24 hours is a level of hygiene most seats don’t offer
- Bowl mist is a practical feature that improves flushing efficiency
- Smart home integration (Alexa, Google Home) is rare at any price point in this category
- Nightlight and motion lid make it perfect for nighttime use without fumbling for anything
Cons
- Premium price — noticeably more expensive than the E815
- Smart home setup adds complexity for less tech-savvy users
- Doesn’t include the unique rotating three-spray-mode wand found on the E815
The E930 is the right call if you want the most refined, spa-like experience Kohler makes — and you value design, smart features, and unlimited warm water above all else.
If you’re also exploring alternative premium options, our roundup of the best bidets for existing toilets covers some excellent alternatives at multiple price points.
Check its current price on Amazon
Spray Performance: E815 vs E930
This is where the two seats take genuinely different approaches — and your preference here could decide the winner for you.
The E815 features a rotating three-sided wand that delivers three distinct modes: Stream (direct and strong), Mist (gentler, mid-range), and Air Mist (the softest, air-infused option for sensitive skin).
The 3D wash on the E815 moves the spray both front-to-back and side-to-side, giving you broader coverage that many users find more thorough.
The E930 takes a more traditional route with oscillating and pulsating sprays — both effective and comfortable, but without the rotating wand mechanics.
If variety and novelty in spray modes matters to you, the E815 has the edge here.
Winner: Kohler PureWash E815
Water Heating: E815 vs E930
This is one of the clearest differences between the two seats — and it matters more than you might think.
The E815 uses a tank-type heater, which stores a reservoir of hot water and delivers it consistently — until the tank empties.
For most average users this won’t be an issue, but if you prefer longer wash sessions or share the seat with multiple people in quick succession, you may occasionally notice the water cooling down.
The E930’s inline continuous heater solves this entirely — it heats water on demand with no tank, meaning you’ll never run out of warm water no matter how long the session.
For families or anyone who values that consistent warmth on every single use, the E930 wins this category outright.
Winner: Kohler PureWash E930
Hygiene and Cleanliness: E815 vs E930
Both seats take wand hygiene seriously — but the E930 goes further.
The E815 automatically rinses the wand before and after every use, which is the standard approach and genuinely effective for day-to-day cleanliness.
The E930 adds UV light sanitization of the stainless steel wand every 24 hours — a process that actively kills bacteria and keeps the wand at a higher standard of hygiene between uses.
The E930 also adds a bowl mist feature, where the bowl is automatically pre-misted with water before use, helping waste slide off more cleanly during flushing.
If you’re a hygiene-first buyer — and many bidet shoppers are — the E930’s UV system is worth taking seriously.
You can also read our breakdown of the handheld bidet vs bidet seat comparison to understand why electric seats like these lead the hygiene conversation.
Winner: Kohler PureWash E930
Design and Profile: E815 vs E930
If bathroom aesthetics matter to you, this category deserves serious attention.
The E815 has a clean, modern design — but its slightly bulkier profile (6-11/16″ height) is typical of bidet seats with a tank heater built in.
The E930 is in a completely different league visually.
At just 3-9/16″ high, it’s the slimmest bidet seat Kohler makes — and it sits so flush to the toilet that guests may not even notice it’s a bidet seat at first glance.
Combined with the motion-activated lid, the E930 delivers the kind of touchless, sculptural bathroom experience you’d expect from a high-end smart toilet.
Winner: Kohler PureWash E930
Smart Features and Convenience: E815 vs E930
The E815 keeps it simple — you get a handheld remote with two programmable presets, and that covers the vast majority of users’ needs day-to-day.
The E930 goes significantly further with the Kohler Konnect app, letting you control and personalize every function from your smartphone.
It also works with Amazon Alexa and Google Home, so if you’re building a smart bathroom or just enjoy voice control, the E930 plugs right into your existing ecosystem.
Add in the motion-activated lid (no touching required), the automatic nightlight, and the bowl mist automation, and the E930 genuinely removes almost all manual interaction from the process.
If you’re interested in where bidet technology is headed, our article on why bidets are becoming more popular covers exactly this wave of smart bathroom innovation.
Winner: Kohler PureWash E930
Verdict — Which One Should You Buy?
Both seats are excellent — but they serve very different buyers, and the right choice comes down to what you actually value.
Buy the Kohler PureWash E815 if:
- You want Kohler quality at a more accessible price point
- The rotating wand with three spray modes appeals to you
- You have kids and want a built-in child mode
- You don’t need smart home integration or a motion-activated lid
- Shorter to moderate wash sessions are the norm in your household
Buy the Kohler PureWash E930 if:
- You want Kohler’s most premium, luxury bidet seat experience
- Continuous warm water is important for your comfort
- You value a slim, barely-there profile that blends with your toilet
- UV wand sanitation and bowl mist matter to your hygiene standards
- Smart home integration with Alexa or Google Home excites you
- You want the motion-activated lid for a fully hands-free experience
If budget is your primary constraint, the E815 is the smarter pick — and you’ll still get a genuinely impressive bidet with unique spray technology.
If you want the best Kohler has to offer with no compromises, the E930 is the one to get.
FAQ
Is the Kohler C3-325 the same as the PureWash E815?
Yes — the Kohler C3-325 has been rebranded as the PureWash E815.
Kohler transitioned their bidet seat lineup from the C3 naming convention to the PureWash branding, but the underlying product (model K-28119) is essentially the same seat with the same features.
If you were shopping for the C3-325, the E815 is what you’re looking for.
Do both seats require electricity to operate?
Yes — both the E815 and E930 are electric bidet seats that require a nearby GFCI-protected outlet.
If your bathroom doesn’t have an outlet near the toilet, you’ll need to have one installed before either seat will work.
If you’d prefer a non-electric alternative, check out our guide on the bidet toilet vs bidet seat options available.
Which Kohler bidet seat is better for seniors?
For seniors, the E930’s motion-activated lid, voice control capability, and hands-free features make it particularly convenient for those with limited mobility.
The E815 is also a solid option with its simple remote and child mode, but the E930’s additional automation reduces the need to bend, reach, or press buttons.
Our full guide on the best bidets for seniors covers more tailored recommendations if mobility is a key concern.
Will these seats fit my existing toilet?
Both the E815 and E930 are designed for elongated toilets and are compatible with most standard two-piece elongated models from major brands.
Kohler publishes a detailed compatibility guide on their website that lists which of their own toilet models work with each seat.
If you have a one-piece, compact elongated, or designer skirted toilet, check the compatibility chart carefully before purchasing — some unusual bowl shapes can limit fit.
Conclusion
The Kohler PureWash E815 and E930 represent two distinct rungs on the same quality ladder — and both are worth your serious consideration depending on where you are in your bidet journey.
The E815 delivers unique spray technology, reliable Kohler build quality, and a feature set that will genuinely impress most buyers — all at a more accessible price.
The E930 takes everything to the next level with continuous hot water, UV wand sanitization, motion-activated lid, bowl mist, and full smart home integration — it’s the seat for buyers who want their bathroom to feel truly modern.
Whichever you choose, you’re upgrading to one of the most trusted names in the business — and you can explore more options in our bidet toilet seat comparison chart or check out the best bidet brands guide if you want to see how Kohler measures up against the full field.
