If you’re shopping for a non-electric bidet seat, the Brondell CL99 and S101 are two names you’ll keep running into — and for good reason.
Both are part of Brondell’s popular Ecoseat line, but they’re sold through different channels, and knowing the real differences between them could save you time and money.
| Feature | Brondell Swash CL99 | Brondell Swash S101 |
|---|---|---|
| Image |  |
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| Dimensions (L x W x H) | Elongated: 20.03″ x 14.39″ x 2.55″ / Round: 18.47″ x 14.34″ x 2.55″ | Elongated: 20.03″ x 14.39″ x 2.55″ / Round: 18.47″ x 14.34″ x 2.55″ |
| Power Source | Non-electric (water pressure only) | Non-electric (water pressure only) |
| Water Temperature | Ambient (cold/room temp) | Ambient (cold/room temp) |
| Nozzles | Dual retractable self-cleaning nozzles | Dual retractable self-cleaning nozzles |
| Wash Modes | Rear wash, front/feminine wash | Rear wash, front/feminine wash |
| Seat Lid | Slow-close ergonomic lid | Slow-close ergonomic lid |
| Retail Channel | Costco + general retail | Standard online retail |
| Buy Now |  |
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1. Brondell Swash CL99 Non-Electric Bidet Seat
The Brondell Swash CL99 is the Costco-channel version of Brondell’s beloved Ecoseat platform — and it’s one of the most popular non-electric bidet seats sold through big-box retail.
It delivers the same reliable performance as the broader Ecoseat line but is often available at an even sharper price point when Costco runs it in-warehouse.
If you’ve been shopping for a bidet for your existing toilet and want a full replacement seat (not just an attachment), the CL99 is one of the most accessible options you’ll find.
Features
- Dual retractable self-cleaning nozzles (rear and frontal wash)
- Fully adjustable water pressure via jog dial control
- Operates on water pressure only — no electricity, no batteries
- Slow-close ergonomic seat and lid
- Quick-release hinges for easy removal and cleaning
- Available in elongated and round bowl sizes
- Supply water pressure range: 14–100 psi
Pros
- No need for an electrical outlet near your toilet
- Ultra-slim 2.55″ profile blends into any bathroom
- Nozzles self-clean before and after every wash cycle
- DIY installation in under 20 minutes — no plumber needed
- Reduces toilet paper use significantly, helping your budget and the planet
Cons
- Water is ambient temperature only — no warm water option
- No heated seat, air dryer, or remote control
- Availability through Costco can vary by season and region
The CL99 is the right seat for any household that wants a clean, eco-friendly upgrade without touching the electrical panel.
It’s especially well-suited for bathrooms that don’t have an outlet near the toilet — a limitation that rules out most self-cleaning electric bidet seats.
Check its current price on Amazon
2. Brondell Swash Ecoseat S101 Non-Electric Bidet Seat
The Brondell Swash Ecoseat S101 is the standard retail version of the same Brondell non-electric seat platform — sold through major online retailers and available year-round without warehouse membership restrictions.
If you’ve been comparing entry-level options in our guide to the best bidets under $200, you’ve likely already seen the S101 near the top of budget-friendly recommendations.
It matches the CL99 spec-for-spec and is Brondell’s widely available, consistent listing for buyers who want reliable delivery and a clear warranty pathway.
Features
- Dual retractable nozzles for rear (posterior) and front (feminine) wash
- Adjustable water pressure — controlled by the side dial
- 100% non-electric operation powered by home water pressure
- Slow-close seat and lid with quick-release hinges
- Textured chrome dial accent for a polished look
- Fits both elongated and round toilets
- Dimensions (elongated): 20.03″ x 14.39″ x 2.55″
Pros
- Available year-round through standard online retail — no membership required
- Includes everything needed for installation in the box
- Reduces toilet paper dependency by up to 75% according to Brondell
- Works in any bathroom regardless of outlet proximity
- Strong customer service and warranty support from Brondell direct
Cons
- Cold water only — same limitation as the CL99
- No advanced features like a heated seat or warm air dryer
- Side-dial control may take a session or two to master
The S101 is the smart pick if you want consistent availability, easy returns, and a product that’s been vetted by thousands of buyers across major retail platforms.
It’s also the version you’ll want to compare if you’re weighing a bidet seat versus a handheld sprayer — the full seat replacement provides a far cleaner, more integrated look in your bathroom.
Check its current price on Amazon
Are the CL99 and S101 Actually the Same Product?
This is the question that brings most buyers to this comparison — and the honest answer is: functionally, yes.
The Brondell CL99 and S101 are built on the same Ecoseat platform, share identical specifications, and deliver the same cleaning experience.
The differences come down to retail distribution and some minor cosmetic touches:
- The CL99 is Brondell’s Costco-channel SKU — it was originally created for big-box retail and sometimes features slightly different packaging or cosmetic accents (like the chrome dial finish)
- The S101 is Brondell’s standard retail version, sold through major online retailers with year-round, consistent availability
- Brondell’s own support documentation groups the S101 and CL99 together in the same FAQ and troubleshooting guides — confirming they operate identically
If you’re buying for a bathroom without an electrical outlet, both will get the job done equally well.
The practical choice comes down to where you’re shopping, what’s currently in stock, and which delivers the better price on the day you’re buying.
Water Temperature: Cold Only — Is That a Deal-Breaker?
Neither the CL99 nor the S101 offers warm water.
Both rely entirely on your home’s incoming water supply, which means the wash is ambient temperature — warm in summer, cool in winter.
For buyers in warmer climates, this is rarely an issue.
For households in colder regions, the shock of cold water — especially in winter — can be a real deterrent.
If warm water is important to you, Brondell’s own upgrade path is the S102 (dual-temperature), which connects to your hot water supply under the sink.
You can also step up to a fully electric seat — our best bidets for home use guide covers the top options across every budget, including models with instant warm water, heated seats, and warm air dryers.
Installation: Which One Is Easier to Set Up?
Both seats install in the same way — and both take under 20 minutes for most buyers with no prior plumbing experience.
The process is the same for either model: remove your existing toilet seat, attach the mounting plate over the bolt holes, snap the bidet seat into place, and connect the included T-valve to your toilet’s water supply line.
No special tools, no plumber, no electrical outlet.
If you’ve never installed a bidet before, our guide on whether you can install a bidet on any toilet walks through what to check before you buy — including bowl shape and hinge spacing compatibility.
Hygiene and Nozzle Cleaning: Winner — Tie
Both the CL99 and S101 feature Brondell’s dual retractable nozzle system with on-demand self-cleaning.
Every time you start or end a wash cycle, the dial passes through a self-clean notch that activates a high-pressure rinse of the nozzle.
The nozzles stay retracted inside the seat housing when not in use, which keeps them protected from contamination between washes.
For regular maintenance, Brondell recommends wiping the seat and outer casing with a damp cloth using a mild cleaner — and occasionally pulling the nozzles out manually for a soap-and-water cleaning.
This is the same maintenance routine you’d follow for most non-electric seats in this class, including the options reviewed in our best self-cleaning bidets guide.
Verdict: Which One Should You Buy?
Here’s the bottom line on the Brondell CL99 vs S101 decision:
Buy the Brondell CL99 if… you have a Costco membership and can pick it up in-warehouse at a discount, or if you find it listed online at a better price than the S101 on the day you’re shopping.
The core product is identical, so any price advantage the CL99 offers is pure savings with zero trade-off in performance.
Buy the Brondell Swash S101 if… you want consistent year-round availability, straightforward returns through a major online retailer, and a clear warranty pathway with Brondell’s customer support team.
It’s also the safer pick if you want the standard product that all of Brondell’s support documentation, reviews, and comparison guides are written around.
Either way, you’re getting one of the most reliable non-electric bidet seats in the market — a product that replaces your existing toilet seat entirely, delivers a clean dual-nozzle wash, and never adds a cent to your electricity bill.
If you later find you want warm water or a heated seat, upgrading to a full electric seat is always an option — start with our bidet toilet seat comparison chart to see what features are worth paying for.
Frequently Asked Questions
Is the Brondell CL99 the same as the S101?
Functionally, yes. Both seats are built on the same Brondell Ecoseat platform with identical specifications, the same dual-nozzle design, and the same ambient-temperature non-electric operation. The CL99 is distributed through Costco and big-box retail channels, while the S101 is the standard retail version. Brondell groups both under the same support and FAQ documentation.
Can either the CL99 or S101 connect to a hot water supply?
No. Neither the CL99 nor the S101 is designed to connect to a hot water source. They are ambient-temperature seats only. If you want warm water without electricity, Brondell’s S102 (CL129 at Costco) is the dual-temperature version that taps into your bathroom sink’s hot water line. For a fully heated and electronically controlled experience, you’d want to step up to an electric bidet seat with a heated seat.
Which toilet shapes do these seats fit?
Both the CL99 and S101 are available in elongated and round versions. The elongated model measures 20.03″ x 14.39″ x 2.55″ and fits elongated bowls in the 18″–19.5″ range. The round version measures 18.47″ x 14.34″ x 2.55″ and fits round bowls in the 16″–17.75″ range. Always check your toilet bowl’s measurements against Brondell’s fit guide before purchasing.
Do these seats require any tools to install?
No special tools are required. A standard screwdriver is typically all you’ll need to remove your existing seat. Brondell includes all necessary hardware — the T-valve, bidet hose, mounting plate, and brackets — in the box. Most buyers complete installation in 15–20 minutes. If you’re unsure whether your toilet is compatible, our guide on installing a bidet on any toilet is a helpful starting point.
Conclusion
The Brondell CL99 vs S101 decision is genuinely one of the simplest in the bidet world — because you’re really comparing two names for the same excellent product.
Both seats give you Brondell’s reliable Ecoseat platform: dual self-cleaning nozzles, adjustable water pressure, a soft-close lid, and easy DIY installation — all without requiring a single electrical outlet.
If you find the CL99 at a better price, grab it.
If the S101 is what’s in stock and readily available, you’re getting exactly the same clean.
For buyers who want to explore the full non-electric bidet landscape — including attachments, warm-water seats, and entry-level electric options — our best bidets for existing toilets guide and our best bidet brands overview are great next reads.
Whichever model you choose, you’re making one of the easiest and most sustainable upgrades your bathroom can get.
