Toto C100 Review 2026: Washlet Electronic Bidet Toilet Seat

Last updated: October 24, 2026

If you’re looking for a budget-friendly bidet toilet seat, the TOTO C100 electronic bidet seat is worth considering. Although it is an older WASHLET model, it offers many useful features that make everyday bathroom visits more comfortable and hygienic.

The TOTO C100 comes with a heated seat, adjustable water pressure and temperature, a SoftClose seat and lid, a self-cleaning wand, warm air dryer, automatic air deodorizer, and convenient side control panel. It also includes TOTO’s PREMIST technology, which helps keep waste from sticking to the toilet bowl.

However, the C100 is an older model, and availability can be limited in 2026. Some retailers have discontinued their listings, so buyers should compare its price with newer TOTO WASHLET models before making a decision.

Read this complete TOTO C100 review to learn about its features, performance, installation requirements, advantages, and drawbacks.

Related: TOTO C200 WASHLET Review

We’ve also included a comparison between the C100 and C200 to help you decide which electronic bidet seat better suits your needs.

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Pros & Cons: Why Buy the TOTO C100 Electronic Bidet Toilet Seat?

Pros

• Sleek and durable plastic construction.
• Self-cleaning wand with front, rear, and soft rear cleansing modes.
• PREMIST helps prevent waste from sticking to the bowl.
• SoftClose seat and lid prevent slamming.
• Convenient side-mounted control panel.
• Elongated and round versions are available.
• Adjustable warm-water washing and pressure settings.
• Warm air dryer reduces the need for toilet paper.
• Built-in air deodorizer helps control bathroom odors.
• Heated seat with adjustable temperature.
• Energy-saving mode reduces unnecessary heating.
• One-year limited manufacturer’s warranty.

Cons

• No built-in nightlight.
• No wireless remote control.
• Does not include the pulsating cleansing feature offered by the C200.
• Requires a nearby grounded electrical outlet.
• Uses a warm-water reservoir rather than an instantaneous heating system.
• May not fit every toilet bowl or tank design.
• Availability may be limited because it is an older model.

TOTO C100 WASHLET Technical Specifications

The SW2034 is designed for elongated toilet bowls. If your toilet has a round bowl, you will need the compatible round C100 version instead.

TOTO C100 Advanced Bidet Toilet Seat Review in 2026

Sleek and Elegant Construction

The TOTO WASHLET C100 brings additional comfort and convenience to a regular toilet. Its modern design looks attractive in most bathrooms, while the durable plastic construction makes the seat easy to maintain.

Unlike a complete smart toilet, the C100 is an electronic seat that attaches to a compatible existing toilet. This makes it a practical choice for homeowners who want bidet features without replacing the entire fixture.

Installation is manageable for many homeowners. However, you must have a compatible toilet, a suitable water connection, and a nearby grounded electrical outlet.

Convenient Control Panel

The TOTO C100 features a control panel attached to the right side of the seat. This arrangement makes the different functions accessible while seated.

With the panel, you can adjust water pressure, cleansing position, seat temperature, water temperature, and other settings.

The C100 does not include a wireless remote control. If you prefer a separate remote, the TOTO C200 may be more convenient.

For more options, you can also compare the features in our Bio Bidet reviews.

Self-Cleaning Nozzle

The TOTO C100 offers three cleansing options: rear wash, soft rear wash, and front wash.

The rear wash provides regular cleansing, while the soft rear setting uses a gentler spray. The front wash is designed for feminine cleansing.

The bidet also offers an oscillating spray that moves back and forth for better coverage. Users can adjust the wand position and water pressure to improve comfort.

The wand automatically rinses itself before and after use. However, regular cleaning is still necessary to maintain hygiene and reliable performance.

Soft-Closing Seat

One feature that makes the C100 comfortable to use is its SoftClose seat and lid.

Instead of dropping suddenly, the seat closes slowly and quietly. This prevents loud slamming noises and reduces unnecessary impact on the seat and toilet bowl.

It is a particularly useful feature in family bathrooms.

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Adjustable Warm Water and Pressure

The TOTO C100 allows users to adjust both cleansing water temperature and spray pressure.

This is particularly helpful during colder months when cold-water washing can feel uncomfortable.

You can select a gentler spray for sensitive skin or increase the pressure when stronger cleansing is preferred.

The C100 uses a heated water reservoir, so the amount of continuously available warm water is limited. During longer washing sessions, the water may become cooler until the reservoir reheats.

PREMIST Technology

PREMIST is one of the most useful features of the TOTO C100.

Before use, the WASHLET sprays a light mist of water inside the toilet bowl. This wets the ceramic surface and makes it harder for waste to stick.

As a result, the toilet bowl can remain cleaner between regular cleaning sessions.

However, PREMIST does not replace the need for cleaning products or routine maintenance.

Heated Seat

The heated seat is another excellent feature, especially during winter.

Instead of sitting on a cold surface, you can select a comfortable seat temperature using the control panel.

The temperature can also be lowered or switched off when heating is unnecessary.

When the energy-saving function is active, the C100 automatically reduces heating during periods when the toilet is used less frequently.

Warm Air Dryer

The C100 includes a warm air dryer that helps dry your skin after cleansing.

This feature can reduce your dependence on toilet paper, although some users may still prefer a small amount of paper for faster drying.

The dryer temperature is adjustable, allowing you to choose a comfortable setting.

Drying generally takes longer than wiping with toilet paper, but it provides a convenient hands-free option.

If you want to compare other premium electronic seats, read our Brondell Swash 1400 review.

Automatic Air Deodorizer

The built-in air deodorizer helps reduce unpleasant odors during bathroom use.

When activated, the system draws air through a deodorizing filter to help control odors around the toilet.

Unlike air fresheners that add fragrance, the deodorizer is designed to reduce odors.

The filter should be cleaned according to the manufacturer’s instructions to maintain its performance.

Energy Saver

The TOTO C100 includes an intelligent energy-saving feature that helps reduce electricity consumption.

The system learns when the toilet is used less frequently and adjusts heating during those periods.

According to TOTO’s operating instructions, it may take approximately ten days for the automatic energy-saving function to recognize regular usage patterns.

The seat and water heaters can operate at reduced temperatures during periods of low usage. This helps avoid unnecessary heating without requiring constant manual adjustments.

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Installation Requirements

Installing the C100 is usually straightforward if your toilet is compatible.

The seat attaches using a mounting plate, and the supplied water connection allows the WASHLET to receive water from the toilet’s existing supply.

Before installation, check these requirements:

• Confirm that you have the correct elongated or round model.
• Measure the toilet to ensure adequate clearance near the tank.
• Use a properly grounded 120V GFCI-protected electrical outlet.
• Check that the water supply connection is compatible.
• Follow the manufacturer’s installation and electrical safety instructions.

Do not use an extension cord or an ungrounded outlet to power the WASHLET.

Price & Warranty

The TOTO C100 was originally positioned as a more affordable alternative to premium WASHLET models.

However, because it is an older product, its price and availability can vary considerably in 2026. Some stores list it as discontinued, while remaining inventory may still be available from other sellers.

Before buying, compare the total price with newer WASHLET options and check whether replacement parts remain accessible.

The C100 also comes with a one-year limited manufacturer’s warranty, subject to the applicable warranty conditions.

TOTO C100 vs. C200: Which WASHLET Is Better?

Both the TOTO C100 and C200 provide warm-water cleansing, heated seating, PREMIST, a deodorizer, and a warm air dryer.

The biggest differences concern the control system and available cleansing functions.

Which should you choose? The C100 is suitable if you want essential bidet functions and do not need a remote. The C200 is more convenient for users who prefer wireless controls, pulsating washing, and saved user preferences.

Troubleshooting the TOTO C100 Electronic Bidet Toilet Seat

Most common C100 problems involve the water supply, temperature settings, power connection, or routine maintenance.

If the electrical unit is damaged, produces unusual smells, or repeatedly trips the GFCI, stop using it and contact a qualified service professional.

Is the TOTO C100 Worth Buying in 2026?

The TOTO C100 remains a capable electronic bidet seat for homeowners who want warm-water washing, a heated seat, and convenient drying functions.

Its PREMIST technology, adjustable cleansing settings, and deodorizer make it much more comfortable than a basic toilet seat.

However, the C100’s age is an important consideration. If the remaining stock is priced close to newer TOTO models, purchasing a more recent WASHLET may offer better long-term value.

For buyers who find a reasonably priced unit from a reputable seller, the C100 can still be a practical bathroom upgrade.

Conclusion

The TOTO C100 is an electronic bidet seat with several useful features, including a heated seat, adjustable warm-water washing, warm air dryer, self-cleaning wand, PREMIST, and automatic air deodorizer.

Its side-mounted controls are straightforward, and the SoftClose seat makes daily use more comfortable.

The biggest drawbacks are the lack of a wireless remote, limited warm-water reservoir, and potentially restricted availability.

Overall, our TOTO C100 review finds it a good option for homeowners who want essential WASHLET features without paying for advanced functions they may never use. Just compare current availability and pricing with newer models before purchasing.

Frequently Asked Questions

1. Can I install the TOTO C100 on any elongated toilet?

No. Although the SW2034 is designed for elongated toilets, some bowl and tank shapes may prevent proper installation. Measure your toilet and check TOTO’s compatibility requirements before ordering. A separate round C100 version is available for compatible round bowls.

2. Does the TOTO C100 require electricity?

Yes. The C100 requires a properly grounded 120V electrical connection. A GFCI-protected outlet should be available near the toilet.

3. Does the TOTO C100 use hot water from the bathroom plumbing?

No. The C100 connects to the cold-water supply and heats the cleansing water internally. You do not need a separate hot-water connection.

4. Are the plumbing connections metric or standard?

The North American C100 package includes connections intended for common compatible toilet installations. The supplied junction fitting typically connects near the toilet tank’s fill-valve connection. Always follow the instructions for your specific model and region.

5. Does the TOTO C100 have a remote control?

No. The C100 uses a side-mounted control panel. If you prefer a wireless remote, consider the TOTO C200 or another compatible WASHLET model.

6. Is the TOTO C100 discontinued?

The C100 is an older WASHLET series, and some retailers have marked specific models as discontinued. Availability may vary by seller and region in 2026. Check current listings and replacement-part availability before purchasing.

7. Can I use the TOTO C100 without toilet paper?

Yes. The C100 provides water cleansing and a warm air dryer, so some people can avoid toilet paper entirely. However, drying takes time, and personal preferences vary.

8. How do I clean the TOTO C100 nozzle?

Use the wand-cleaning function to extend the nozzle for maintenance. Clean it gently according to TOTO’s instructions, avoiding abrasive tools and harsh chemicals that could damage the components.