TOTO C5 vs K300 vs S550e: Which Bidet Seat Is Right for You?

Your bathroom, a sanctuary of privacy and self-care, deserves the best. It’s where you kickstart your day with energy and unwind after long hours of toil. Imagine if you could enhance this personal haven with a touch of luxury and innovation. Today, we introduce you to three exceptional contenders in the world of bidet seats: the TOTO K300, TOTO C5, and TOTO S550e. These advanced bathroom fixtures aim to revolutionize your daily hygiene routine. But with different features and capabilities, which one truly elevates your bathroom experience? In this comprehensive comparison, we’ll guide you through the intricacies of these bidet seats, so you can make an informed decision and bring a touch of opulence to your bathroom. Let’s embark on this journey to discover the perfect fit for your bathroom needs.

Table Of Contents

Overview of Key Differences

Before we dive into the nitty-gritty details, let’s get an overview of the key differences that set the TOTO K300, TOTO C5, and TOTO S550e apart.

FeaturesTOTO S550eTOTO K300TOTO C5
WASHLET ControlsLuxury RemoteLuxury RemoteLuxury Remote
Heated Seat
SoftClose Lid
Adjustable Rear and Front Cleansing Streams
Air Dryer with Adjustable Temperature Settings
Oscillating & Pulsating Cleansing
Air Deodorizer
Front Cleanse (Feminine Wash)Wide Front and Front Cleanse OptionsFront CleanseFront Cleanse
Water Heating TechnologyContinuous water heating that never runs outContinuous water heating that never runs outWater heating reservoir to store warm water
Auto Open and Close Seat and Lid
Night Light
Advanced CleaningEWATER+ Technology – Cleans Bowl and Wand Before and After Each Use; PREMIST – Sprays Water Onto Bowl Before Each Use Creating a Slick SurfaceEWATER+ Technology – Cleans Bowl and Wand Before and After Each Use; PREMIST – Sprays Water Onto Bowl Before Each Use Creating a Slick SurfaceEWATER+ Technology – Cleans Bowl and Wand Before and After Each Use; PREMIST – Sprays Water Onto Bowl Before Each Use Creating a Slick Surface
PriceCheck latest price on AmazonCheck latest price on AmazonCheck latest price on Amazon

As you can see, the TOTO S550e offers a comprehensive set of features, including a night light and auto open/close functionality, making it the most advanced and convenient option. The TOTO K300 is a mid-range choice with many essential features, while the TOTO C5 is a budget-friendly option with basic functions. Your choice depends on your preferences for luxury and convenience.

Toto Bidet Seat
Toto Bidet Seat

Similarities and Differences

In comparing the TOTO K300, TOTO C5, and TOTO S550e bidet toilet seats, it’s important to note both their common features and what sets them apart. These seats all aim to elevate your bathroom experience, but they cater to different preferences and priorities.


1. Water Heating System: All three models feature tankless water heating systems. This means you’ll have a continuous supply of warm water for a comfortable and uninterrupted cleansing experience.

2. Adjustable Water Temperature and Pressure: Whether you prefer a gentle, soothing spray or a more invigorating cleanse, these seats offer adjustable water temperature and pressure settings to suit your preferences.

3. Dual-Action Cleansing Spray: Each seat provides a dual-action cleansing spray, offering both soft and hard spray modes for versatile and effective cleaning.

4. Oscillating or Pulsating Functions: You can enjoy maximum comfort with oscillating or pulsating spray patterns, which help ensure thorough cleansing.

5. Hands-Free Dryer: All three models include a warm air dryer with adjustable temperature settings, reducing the need for toilet paper and enhancing the overall hygiene of your bathroom routine.

6. Self-Cleaning Wand: The self-cleaning wand ensures a clean and sanitary experience by cleaning itself before and after each use.

7. Automatic Air Deodorizer: An automatic air deodorizer filters and neutralizes odors, leaving your bathroom smelling fresh.

8. PREMIST Function: These bidet seats feature a PREMIST function that wets the bowl before use, reducing waste adherence and keeping the toilet cleaner.

9. User Presets: You can save your preferred settings for two different users, making it easy for multiple people to customize their experience.

10. Easy Installation: Installation of these bidet seats is straightforward and can typically be done as a do-it-yourself project.


1. Design and Size: The TOTO S550e comes in two designs – contemporary and classic – for a customized look. The TOTO K300 and C5 have a more straightforward design. Additionally, the S550e and C5 are available in elongated sizes, while the K300 is only available in elongated sizes.

2. Ewater+ System: The TOTO S550e is equipped with TOTO’s unique eWater+ system, which uses electrolyzed water for enhanced bowl cleaning and nozzle sanitization. The K300 and C5 lack this feature.

3. Automatic Open/Close Lid: Only the TOTO S550e has an automatic open/close lid feature, adding convenience and a touch of luxury to your bathroom.

4. LED Night Light: The S550e also features an LED nightlight, which can be handy for nighttime bathroom visits. The K300 and C5 do not have this lighting feature.

5. Remote Control: While all three models come with wireless remote controls, the remote for the S550e offers more advanced settings and fine-tuning options. The remotes for the K300 and C5 are simpler in design and functionality.

6. Lid Styles: The S550e offers two lid styles, contemporary and classic, allowing you to choose a design that matches your bathroom decor. The K300 and C5 do not offer these design options.

7. Auto Open/Close Seat and Lid: Only the S550e has a sensor-operated automatic opening and closing seat and lid. This feature is not present in the K300 or C5.

8. Price: The TOTO S550e is positioned as a higher-end model with more advanced features, making it the most expensive of the three. The K300 and C5 aim for a more mid-range market, providing premium features without top-tier pricing.

In summary, while the TOTO K300, TOTO C5, and TOTO S550e share many core features, the differences lie in design, advanced functionalities, and pricing. The choice among these bidet seats ultimately depends on your preferences, budget, and the specific features you value most for your bathroom experience.

Comparisons of Important Features

Warm Water and Comfort:

All three models, the TOTO K300, C5, and S550e, provide a comfortable and hygienic warm water cleansing experience. They allow you to adjust the water temperature to your liking, ensuring a soothing and refreshing cleanse.

Nozzle Systems and Sanitation:

The TOTO S550e, with its unique eWater+ system, takes sanitation up a notch by using electrolyzed water to mist the bowl and sanitize the nozzles automatically. This feature enhances hygiene by reducing the buildup of residue and germs.

While the K300 and C5 lack the eWater+ system, they still feature self-cleaning nozzles and a promising function before each use, maintaining a clean and sanitary environment in your bathroom.

Energy Saver Mode: 

Certainly, when comparing the Energy Saver modes of the TOTO C5, K300, and S550e washlets, the C5 offers a basic Timer Saver function to turn off the heated seat for 6 or 9 hours, while lacking advanced seat temperature adjustments. The K300 steps up with an Auto Energy Saver mode that learns usage patterns and lowers the seat temperature during infrequent use, and it also introduces an Auto Energy Saver+ option that can completely turn off the seat heat during specific times. However, the S550e shines with the most advanced energy-saving features, including both Auto Energy Saver and Auto Energy Saver+, providing optimal adaptability and efficiency for those conscious of conserving energy.

Other Convenience Features:

The TOTO S550e offers a wide range of convenience features, including an LED nightlight for nighttime use and a sensor-operated automatic open/close seat and lid, adding a touch of luxury to your bathroom experience.

The K300 and C5 focus on essential bidet seat functions without the extras, making them straightforward and user-friendly options.

Energy Efficiency Comparison:

The TOTO K300 and C5 both feature tankless water heating systems, ensuring energy efficiency and providing unlimited warm water. This eco-friendly design reduces energy consumption and is cost-effective over time.

The TOTO S550e, while providing the convenience of a warm water cleansing experience, uses slightly more power due to its advanced features.

Bowl Auto-Clean Function:

The TOTO S550e boasts an automatic bowl cleaning function, making it a standout choice for users seeking a low-maintenance option. This feature helps keep the toilet bowl clean with minimal effort.

The K300 and C5 do not include an automatic bowl cleaning function but do provide a PREMIST feature to keep the bowl cleaner for longer.

Wide Front Feminine Mode:

All three models, the TOTO K300, C5, and S550e, offer a comprehensive front spray option in their cleansing functions, providing additional comfort and coverage for feminine cleansing.

Auto Open/Close Function:

Only the TOTO S550e offers an auto open/close seat and lid function, operated by sensors. This hands-free feature adds convenience and a touch of luxury to your bathroom routine.

Seat Height and Curve:

The K300, C5, and S550e all come in a similar height, with slight variations. The K300 is 5.25″ tall, the C5 is a bit taller, and the S550e is the shortest at about 4.5″. These differences may influence your choice based on your comfort preferences and bathroom setup.

Auto-Flush Compatibility:

None of these models include an automatic flushing function, so you’ll need to manually flush your toilet after use.

The TOTO K300, C5, and S550e bidet toilet seats offer various features catering to different user preferences and needs. While the S550e shines with its advanced functions, it comes at a higher price point. The K300 and C5 provide budget-friendly options with essential bidet seat features. Your choice should align with your specific requirements, budget, and desire for additional convenience features in your bathroom routine.

TOTO C5 VS K300 VS S550e: Features, Specs and More



The TOTO WASHLET C5 is a state-of-the-art bidet seat designed to revolutionize your bathroom experience with its high-tech features and user-friendly design. This electronic bidet seat comes with a slim wireless remote control that boasts an illuminated touchpad, making it incredibly easy to use. With just a few touches on the remote, you can enjoy a comprehensive cleansing experience that leaves you feeling fresh and clean after every use.

One of the standout features of the C5 is its PREMIST® function. This innovative technology sprays the toilet bowl with a fine mist of water before each use. This not only helps maintain a clean and hygienic toilet bowl but also prevents waste from sticking, making cleaning easier. It’s a small but effective feature that enhances overall cleanliness in your bathroom.

The cleansing experience provided by the C5 is truly exceptional. It offers gentle aerated warm water with a dual-action spray, including oscillating and pulsating options. This means you can customize your cleansing experience to suit your preferences. Adjusting the water temperature and volume is a breeze, ensuring that your wash is both comfortable and effective.

TOTO C5 Dimensions
TOTO C5 Dimensions

The C5 also comes with a heated seat that has an adjustable temperature control. Say goodbye to the discomfort of sitting on a cold toilet seat, especially during chilly mornings or winter seasons. You can choose the seat temperature that feels just right for you, adding a touch of luxury to your bathroom routine. Additionally, the bidet seat features warm air drying with three variable temperature settings, so you can completely eliminate the need for toilet paper.

Maintaining a pleasant bathroom environment is made easy with the automatic air deodorizer. Unwanted odors are neutralized quickly, leaving your bathroom smelling fresh. The bidet seat’s EWATER+® technology ensures that the wand and bowl are cleaned before and after each use, promoting excellent hygiene standards.

In terms of installation, the C5 is designed for ease and convenience. It includes all the necessary components for installation, such as a power cord and water supply hoses. However, it’s important to note that the C5 may not fit all toilet bowl designs, so compatibility should be checked before purchase. Additionally, using a surge protector is recommended to safeguard against potential damage from power surges.

The TOTO WASHLET C5 bidet seat is available in classic colors like Cotton and Sedona Beige, ensuring it complements your bathroom’s aesthetics. It meets various industry standards and certifications, such as ASME, UL, and more, guaranteeing its quality and reliability. Backed by a one-year limited warranty, the C5 is a top choice for those seeking an enhanced and hygienic bathroom experience.



The TOTO WASHLET K300 is the epitome of luxury and ecological mindfulness, all packed into a sleek and slim design. This high-tech electronic bidet seat brings a new level of comfort and cleanliness to your bathroom routine. With its range of features, it’s designed to provide a luxurious experience while also being environmentally conscious.

One of the standout features of the K300 is its gentle aerated warm water spray, which offers a dual-action cleansing experience with an oscillating feature. You can adjust the water temperature and volume to your liking, ensuring your wash is both comfortable and effective. The instant water heating system ensures continuous warm water, enhancing your comfort while also saving energy.

Say goodbye to the discomfort of sitting on a cold toilet seat, as the K300 comes equipped with a heated seat that offers adjustable temperature control. This feature, along with warm air drying with three variable temperature settings, allows you to personalize your experience to perfection. The bidet seat also features an automatic air deodorizer, quickly neutralizing odors to maintain a pleasant bathroom environment.

The K300 boasts a new slim and elongated seat design, adding a touch of modernity to your bathroom decor. Operating the bidet seat is effortless, thanks to the slim wireless remote control with illuminated buttons. It even allows for two user settings, catering to individual preferences.

TOTO K300 Dimensions
TOTO K300 Dimensions

Installation and maintenance are hassle-free with the K300. It includes a docking station that’s easy to install and clean. The bidet seat is solidly constructed with a closed-front seat and cover, ensuring durability and longevity. It also includes essential components like a power cord and water supply hoses.

In terms of safety and compliance, the K300 meets and exceeds various industry standards and certifications, including ASME, UL, and more. It’s designed to be compliant with codes such as UPC, IPC, NSPC, and NPC Canada. Moreover, it complies with CA Prop 65 warning requirements.

With a power rating of AC 120V 60Hz and a power consumption of 1274W, the K300 is efficient while delivering exceptional performance. It comes with a one-year limited warranty, giving you peace of mind about its quality and reliability.

Please note that the K300 is designed to fit most existing toilets, but it’s essential to review additional dimensions to ensure proper installation. Using a surge protector is recommended to protect the bidet seat from power surges. Additionally, it should only be used with potable water and not recycled water.

In conclusion, the TOTO WASHLET K300 is a luxurious and ecologically mindful addition to your bathroom. Its advanced features and user-friendly design make it an excellent choice for those looking to elevate their bathroom experience while being environmentally responsible.


TOTO S550E Bidet Seat

The TOTO S550e bidet seat is a masterpiece of ecological luxury, designed with both sophistication and sustainability in mind. Its slim and contemporary design seamlessly integrates advanced technology, providing a rejuvenating and eco-friendly bathroom experience.

This high-tech electronic bidet seat boasts a range of innovative features that ensure maximum comfort and cleanliness. The standout feature is the ewater+ system, which automatically mists and cleans the bowl and wand after each use. This not only keeps your toilet exceptionally clean but also reduces the need for harsh chemicals.

The S550e offers fully automated functionality, including a convenient remote control and a heated seat. You can personalize your experience with adjustable water and seat temperatures, ensuring every visit to the bathroom is a pleasure. The bidet seat also includes a warm-air dryer with five variable temperature settings, making it easy to achieve the desired level of comfort.

Toto S550e Dimensions
Toto S550e Dimensions

To maintain a fresh and odor-free bathroom environment, the S550e features a built-in air deodorizing system. Additionally, it includes an auto open/close lid, adding to its user-friendly design. A night light is also integrated, providing gentle illumination during nighttime visits.

Operating the S550e is effortless, thanks to the easy-to-read illuminated remote control. It even accommodates two user settings, catering to individual preferences. Installation and cleaning are made simple with a convenient magnetic wall-mounted cradle and a docking station. The bidet seat’s compact and slim design complements modern bathrooms beautifully.

In terms of specifications, the S550e adheres to industry standards and certifications, including ASME, UL, and more. It’s designed to comply with codes like UPC, IPC, NSPC, and NPC Canada, ensuring safety and quality. Additionally, it meets the requirements of CA Prop 65 warnings.

With a power rating of AC 120V 60Hz and a power consumption of 1288W, the S550e offers both energy efficiency and high performance. It comes with a one-year limited warranty, providing assurance of its quality and durability.

Please note that the S550e may not fit certain toilet bowl designs, so it’s essential to consider compatibility. Using a surge protector is recommended to safeguard the bidet seat from power surges. Furthermore, it should only be used with potable water, not recycled water.

In summary, the TOTO S550e bidet seat is a symbol of sophistication and eco-consciousness. Its advanced features, including the ewater+ system and customizable settings, elevate your bathroom experience while promoting sustainability and cleanliness.

My Using Experience of Toto C5, S550e, and K300

Experience 1: TOTO C5 WASHLET

The TOTO C5 Washlet has truly been a game-changer in my daily routine. It’s remarkable how a small change like this can significantly improve your life. You know those repetitive, mundane tasks that pile up and make you wish for a break? Well, imagine eliminating one of them. With the C5, that’s exactly what happens.

Installation was a breeze, and it does precisely what it’s designed for. However, there’s one small inconvenience – the lack of lights on the remote control. While the nightlight on the seat itself is useful, it would be even better if the remote had its own lighting. But apart from that, this bidet seat has made my life much more comfortable.

TOTO C5 settings panel at the back part of remote
TOTO C5 nozzle

Experience 2: TOTO S550e WASHLET

After spending considerable time researching bidets, I settled on the TOTO S550e, even though it came at a premium compared to other brands. It ticked all the boxes on my checklist, including a nightlight. However, the nightlight turned out to be a bit of a disappointment. Instead of a soothing, continuous glow, it’s a quick flash upon detecting movement.

The automatic lid and seat function, while convenient, seem to slow down over time. The misting feature is a bit questionable in its effectiveness. On the positive side, the remote control is excellent, with a user-friendly design. I particularly liked that it’s wall-mountable. The sleek design is aesthetically pleasing, but in hindsight, I might have explored other options given the price.

Experience 3: TOTO K300 WASHLET

With the TOTO K300 Washlet in my life, my daily bathroom experience has been elevated to a whole new level. This bidet seat has not only improved my hygiene but also added a touch of luxury to my daily routine.

My previous bidet experience was limited to an older model, and I was eager to upgrade within the TOTO family. The K300 seemed like the right choice, and it didn’t disappoint. It boasts a range of features that cater to various preferences.

The rear and front cleansing options are precise and satisfying, with adjustable water pressure and wand positioning. Whether you prefer a gentle spritz or a powerful cleanse, it’s got you covered. The seat temperature control offers three distinct warmth levels, which I find incredibly useful, especially during the colder months.

The dryer is a standout feature, providing strong, warm air to ensure you leave the bathroom feeling fresh and comfortable. The deodorizer, while having mixed reviews, personally, I found it pleasant, emitting a clean and subtle aroma.

The PREMIST function seems like a clever way to prevent bowl staining, and it’s customizable, which is a plus. Additionally, the personal setting lock is handy for households with two users.

While the K300 has many impressive features, it does have its drawbacks. The “soft” rear cleansing option didn’t quite live up to expectations, feeling somewhat underwhelming. The oscillating and pulsating cleansing modes also felt more like gimmicks than essential functions.

The energy-saving settings, while beneficial, may not be as effective as simply turning off the bidet when not in use. The nightlight, though functional, could be improved to provide better visibility in the dark.

In summary, the TOTO K300 Washlet offers a host of features that make it a valuable addition to any bathroom. However, it’s important to weigh these features against your personal preferences and needs, as some may be more essential than others. For those who prioritize continuous warm water and appreciate a comprehensive bidet experience, the K300 is a worthwhile investment.

READ MORE: Toto C2 vs C5 Bidet Toilet Seat

Which is Best Between the Toto C5, S550e, and K300?

Choosing the best bidet seat among the Toto C5, S550e, and K300 comes down to several important factors, including your budget, the level of luxury you desire, functionality, effectiveness, and overall usefulness.

Budget Pick: Toto C5 Washlet

If you’re looking for an efficient and functional bidet seat without breaking the bank, the Toto C5 Washlet is an excellent choice. It provides all the core essentials, including heated seating and adjustable cleansing streams, making it a great budget-friendly option.

Luxury Pick: Toto S550e Washlet

For those who seek the pinnacle of luxury in their bathroom experience, the Toto S550e is the clear winner. With features like automatic lid opening and closing, a nightlight, and a sleek design, it offers a spa-like feel. However, it’s essential to note that this luxury comes at a premium price.

Considering Functionality: Toto K300 Washlet

If you prioritize functionality and a comprehensive bidet experience, the Toto K300 Washlet is a strong contender. It strikes a balance between essential features and advanced options like continuous warm water and a powerful dryer. It’s an excellent choice for those who want a bit more than the basics.

Considering Effectiveness: Toto K300 Washlet

When it comes to effectiveness, the Toto K300 stands out due to its precise controls and customizable settings. Whether you prefer a gentle cleanse or a powerful spray, this bidet seat can accommodate your needs. The heated seat and warm air dryer also add to its overall effectiveness.

Considering Usefulness: Toto S550e Washlet

The Toto S550e, despite its premium price, offers some unique features that can be incredibly useful. The automatic lid and seat, along with the nightlight, enhance convenience during nighttime bathroom visits. However, it’s crucial to remember that usefulness may vary depending on individual preferences.

In conclusion, the “best” bidet seat among the Toto C5, S550e, and K300 ultimately depends on your specific requirements and priorities. If you’re on a tight budget but still want essential bidet functions, the C5 is a solid choice. For those who value luxury and are willing to invest in a high-end bidet experience, the S550e delivers. Meanwhile, the K300 strikes a balance between functionality and comfort, making it a versatile and effective option for a wide range of users.


Does Toto Washlet use a lot of electricity?

The Toto Washlet operates on a power voltage of 120V/60Hz, with a rated energy consumption of 410 watts. This energy-efficient design ensures that the Washlet does not consume excessive electricity, making it a practical and eco-friendly addition to your bathroom.

What temperature is the water in the Toto Washlet?

The Toto Washlet offers a delightful cleansing experience with soothing warm-water cleansing. You can easily adjust the water temperature to your preference, with options ranging from 86 to 104 degrees Fahrenheit. The Washlet’s flexibility in temperature settings ensures your comfort during every use.

How do you increase water pressure in TOTO Washlet?

Adjusting the water pressure in your TOTO Washlet is a breeze. After pressing the “Wand position adjustment” button, the selected position will be illuminated for 10 seconds. You can then fine-tune the water pressure to one of five levels, from softer to stronger, by using the “Water pressure adjustment” button. This user-friendly feature allows you to customize your cleansing experience with ease.


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