TidyJapan

Category: Bidet Toilet Seats

TOTO Washlet bidet seat comparisons using official specs.

  • TOTO Washlet C5 vs S7: Tank or Instant Heating?

    TOTO Washlet C5 vs S7: Tank or Instant Heating?

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: the S7 uses an instantaneous water heater and offers 5 temperature settings for water, seat, and dryer, plus wide front cleansing and a night light; the C5 uses a small tank heater with 3 settings each. The trade-off is power: TOTO rates the S7 at 1290 W (1446 W max) versus 403 W (512 W max) for the C5.

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official product page), all listed under Sources below. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where both tank-type and instant-heating bidet seats are common. Instant heating is usually the feature people mean when they talk about a “step-up” model.

    I haven’t installed either seat. Everything below comes from TOTO USA’s comparison chart, spec sheets, and manuals.

    Quick Comparison Table

    Feature TOTO C5 (SW3084) TOTO S7 (SW4726 / SW4724)
    Shape Elongated Elongated
    Controls Wireless remote Wireless remote (4-user memory)
    Water heating Tank (0.13 gal) Instantaneous
    Water temperature settings 3 5
    Heated seat settings 3 5
    Air dryer temperature settings 3 5
    Water pressure settings 5 5
    Wide front cleansing No Yes
    Oscillating cleanse Yes Yes
    Deodorizer Yes Yes
    PREMIST Yes Yes
    EWATER+ Yes (wand) Yes (wand and bowl)
    Night light No Yes
    Energy-saver timer 6, 9 hours 6, 9 hours
    Rated power 403 W 1290 W
    Max power 512 W 1446 W
    Auto flush capable Not listed Yes, with optional kit on select TOTO toilets
    Annual energy use Not listed Not listed
    Where to buy TOTO C5 SW3084 TOTO S7 SW4726

    Key differences at a glance

    • Water heating: The C5 heats a small 0.13-gallon tank, while the S7 uses an instantaneous heater for continuous warm water.
    • Temperature settings: The S7 offers 5 settings for water, seat, and air temperature, while the C5 offers 3 each.
    • Extra features: The S7 adds wide front cleansing, a night light, EWATER+ for the bowl, and optional auto flush, which the C5 lacks.
    • Power rating: The S7 is rated at 1290 W (1446 W max), while the C5 is rated at 403 W (512 W max).

    The Differences That Matter

    1. Tank vs instantaneous water heating

    The C5 heats water in a small tank (0.13 gal per TOTO’s manual). The S7 spec sheet lists an “instantaneous water heater for continuous warm water and energy savings.”

    TOTO doesn’t publish how long the C5’s warm water lasts or annual kWh for either seat, so I can’t quantify the difference in comfort or energy. What TOTO does say is that the S7 provides “continuous” warm water.

    2. Finer settings

    TOTO’s chart lists 5 settings for water temperature, seat temperature, and air temperature on the S7, versus 3 each on the C5. Water pressure has 5 settings on both.

    3. Extra features on the S7

    Wide front cleansing, a night light that “illuminates the side and the inside of the bowl,” EWATER+ for the bowl as well as the wand, a docking station, and auto flush capability with an optional kit on select TOTO toilets.

    4. Power rating

    The S7 is rated at 1290 W, with 1446 W max. The C5 is 403 W, with 512 W max. These are ratings, not daily use. The S7’s instantaneous heater draws high power only for short bursts, but TOTO publishes no annual figure to confirm actual use. I estimated the C5’s yearly cost in TOTO Washlet C5 power consumption.

    Because of the higher rating, think about which outlet and circuit the seat will use. TOTO’s spec sheet lists a 3.9 ft cord for the S7 and recommends a surge protector.

    Who Should Buy Which?

    Choose the C5 if you:

    • Want a remote, dryer, PREMIST, and EWATER+ at a lower rating (403 W)
    • Are fine with 3 temperature settings
    • Use the bidet for short washes

    Choose the S7 if you:

    • Want continuous warm water from an instantaneous heater
    • Want finer 5-level temperature control
    • Want wide front cleansing and a night light
    • May add auto flush with a compatible TOTO toilet

    If you want the S7 with a lid that opens by itself, see TOTO S7 vs S7A. If the C5 is already a stretch, compare it with the side-panel model in TOTO C2 vs C5.

    Check price of TOTO Washlet C5 on Amazon
    Check price of TOTO Washlet S7 on Amazon

    Tank vs Instant: TOTO Japan’s Take

    TOTO Japan explains the tank-type (貯湯式) vs instant (瞬間式) split the same way this comparison does: tank models keep warm water ready, instant models heat it on demand. TOTO adds one practical note: with instant models, in winter or when water is cold, the nozzle can take longer to come out after you press wash. The time can’t be changed, because it’s preparation time for heating. TOTO Japan’s top Washlet, the Apricot, uses instant heating. Japanese models differ from the US C5 and S7 and are built for 100 V.

    One Japanese reviewer on Kakaku.com, upgrading from an older Washlet to an instant-heating Apricot F3A, noted a short wait before the spray starts but called it no real problem; others mention quiet operation. (Third-party reviews, not our own testing.)

    Washlet C5 vs S7: Frequently Asked Questions

    What is the main difference between the TOTO C5 and S7?

    Water heating. The C5 uses a tank, and the S7 uses an instantaneous heater, per TOTO’s documents.

    Does the S7 use more electricity?

    Its rating is higher (1290 W vs 403 W). Annual kWh is not listed for either model, so actual yearly use isn’t confirmed.

    Do both have a remote?

    Yes. Both come with a wireless remote; the S7’s stores settings for up to 4 users.

    Does the C5 have a night light?

    A night light isn’t listed for the C5 on TOTO’s comparison chart.

    Will both fit my toilet?

    Both are elongated. Check TOTO’s fit requirements in which TOTO Washlet fits my toilet.

    Is there a round S7?

    TOTO lists the S7 as elongated only.

    Check price of TOTO Washlet C5 on Amazon
    Check price of TOTO Washlet S7 on Amazon

    Sources

    Specs checked October 2026. Prices and availability change, so check the current listing before buying.

  • TOTO Washlet S7 vs S7A: Is the Auto Lid Worth It?

    TOTO Washlet S7 vs S7A: Is the Auto Lid Worth It?

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: on TOTO’s official spec sheets, the S7 and S7A share the same wash, dryer, heated seat, PREMIST, EWATER+, and power specs. The one feature difference is that the S7A has a touchless automatic open/close lid (and a remote-controlled seat), so pick the S7 unless hands-free lid operation matters to you.

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official documentation), all listed under Sources below. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where lids that open by themselves when you walk into the restroom are common in newer homes and department stores.

    I haven’t installed either seat. This comparison uses TOTO USA’s official spec sheets, comparison chart, and instruction manual.

    Quick Comparison Table

    Spec TOTO S7 (SW4726 / SW4724) TOTO S7A (SW4736 / SW4734)
    Lid styles Contemporary (SW4726), Classic (SW4724) Contemporary (SW4736), Classic (SW4734)
    Shape Elongated Elongated
    Auto open/close lid No Yes (touchless)
    Remote-controlled seat (TOTO chart) No Yes
    Power rating AC 120 V, 60 Hz AC 120 V, 60 Hz
    Power consumption 1290 W 1290 W
    Max power consumption 1446 W 1446 W
    Water heating Instantaneous Instantaneous
    Water / seat / air temp settings 5 / 5 / 5 5 / 5 / 5
    Water pressure settings 5 5
    Wide front cleansing Yes Yes
    PREMIST / EWATER+ Yes / Yes (wand and bowl) Yes / Yes (wand and bowl)
    Night light Yes Yes
    User memory 4 users 4 users
    Energy-saver timer 6, 9 hours 6, 9 hours
    Power cord length 3.9 ft (1.2 m) 3.9 ft (1.2 m)
    Shipping weight 14.5 lb 15 lb
    Shipping dimensions 23-3/8 x 17-5/8 x 6-1/4 in 23-3/8 x 17-5/8 x 6-1/4 in
    Warranty 2-year limited (residential) 2-year limited (residential)
    Annual energy use Not listed Not listed
    Where to buy TOTO S7 SW4726 TOTO S7A SW4736

    AT40 versions (e.g., SW4726AT40) are the WASHLET+ / auto flush compatible versions, per TOTO’s parts manual.

    Key differences at a glance

    • Automatic lid: The S7A has a touchless auto open/close lid and a remote-controlled seat, while the S7 does not.
    • Weight: The S7A ships at 15 lb, half a pound more than the S7’s 14.5 lb.
    • What stays the same: Both are rated at 1290 W (1446 W max) and share the instantaneous heater, 5-setting dryer, EWATER+ for wand and bowl, night light, and auto flush capability.

    The Differences That Matter

    1. Automatic lid

    TOTO’s S7A spec sheet lists a “touchless auto open/close lid.” The S7 sheet doesn’t. TOTO’s comparison chart also marks the S7A, not the S7, for “remote controlled seat.”

    That’s essentially the whole difference. If you’re happy lifting the lid yourself, the S7 gives you the same washing and drying hardware.

    2. Weight

    The S7A ships at 15 lb vs 14.5 lb for the S7, which fits with the extra lid mechanism. The shipping dimensions are identical.

    What’s the same

    Power ratings match exactly: 1290 W rated and 1446 W max, on a 3.9 ft cord. Both list an instantaneous water heater, a warm air dryer with five temperature settings (95-140°F), heated seat with adjustable surface temperature (82-97°F), oscillating and pulsating spray, wide front cleansing, PREMIST, EWATER+ for wand and bowl, CLEAN RESIN, SoftClose seat, night light, and auto energy saver.

    Both are listed as “Auto Flush capable with optional auto flush kit when installed on select TOTO toilets only.”

    How They Compare With the C Series

    The S7 line is a big step up from the C5 in power rating: 1290 W vs 403 W, mostly because of the instantaneous water heater. I break that down in TOTO C5 vs S7. If you’re still deciding between the entry models, see TOTO A2 vs C2.

    Before buying either S7 model, check that your toilet is elongated and has clearance. TOTO says both are “compatible with most elongated toilets”; my guide on which TOTO Washlet fits my toilet walks through the measurements.

    Who Should Buy Which?

    Choose the S7 if you:

    • Want the full S-series wash, dryer, and hygiene features
    • Don’t need the lid to open by itself
    • Want the lower-cost model of the two

    Choose the S7A if you:

    • Want a touchless automatic open/close lid
    • Want to control the seat and lid from the remote
    • Have someone in the household who finds lifting the lid inconvenient
    Check price of TOTO Washlet S7 on Amazon
    Check price of TOTO Washlet S7A on Amazon

    Auto Lids and Japan’s Washlet Lineup

    Automatic features are common in Japanese Washlets. TOTO Japan’s top model, the Washlet Apricot, adds features the US S7 line doesn’t list in the same form: a pre-use mist that wets the bowl to resist grime, electrolyzed “kirei jokin-sui” water that cleans the bowl, nozzle and underside of the seat, an approach-activated night light, and learning-based power saving. Japanese models carry different names and part numbers, are built for 100 V and Japanese toilets, and aren’t sold as US replacements, so use them as context, not as a shopping alternative.

    Japanese reviewers of the Apricot on Kakaku.com often say the auto-opening lid and automatic flushing are convenient; some note the motion sensor may not react if the door is to the side of the toilet. (Third-party reviews, not our own testing.)

    Washlet S7 vs S7A: Frequently Asked Questions

    What is the difference between the TOTO S7 and S7A?

    Per TOTO’s spec sheets, the S7A adds a touchless automatic open/close lid. TOTO’s chart also lists a remote-controlled seat for the S7A only.

    Do the S7 and S7A use the same power?

    Yes. Both are 1290 W rated with 1446 W max.

    Are both round and elongated?

    TOTO lists these models as elongated only.

    What do Classic and Contemporary mean?

    They’re lid styles: SW4724/SW4734 are Classic, SW4726/SW4736 are Contemporary.

    What does AT40 mean?

    TOTO’s parts manual lists AT40 versions as WASHLET+ and auto flush compatible.

    How much electricity does an S7 use per year?

    Not listed. TOTO gives rated and max wattage, not annual kWh.

    Check price of TOTO Washlet S7 on Amazon
    Check price of TOTO Washlet S7A on Amazon

    Sources

    Specs checked October 2026. Prices and availability change, so check the current listing before buying.

  • Will a TOTO Washlet Fit My Toilet? Round vs Elongated

    Will a TOTO Washlet Fit My Toilet? Round vs Elongated

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: Measure from the seat mounting holes to the front of the bowl: about 18.5 inches means elongated, about 16.5 inches means round. Then check TOTO’s clearances: at least 2 inches from the tank to the mounting-hole centers, about 5-1/2 inches between hole centers, and 8 inches of flat bowl surface.

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official documentation), all listed under Sources below. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where Washlet-style seats are standard in most homes. In the US, though, the fit question comes first because toilets vary so much.

    Everything below comes from TOTO USA’s official Washlet fit chart and comparison pages. I haven’t installed these seats myself.

    Step 1: Round or Elongated?

    Bowl type Mounting holes to front of bowl (TOTO)
    Round About 16-1/2 in (420 mm)
    Elongated About 18-1/2 in (470 mm)

    Measure from the center of the seat bolt holes to the front lip of the bowl. Buy the matching shape. Many TOTO models come only in elongated.

    Step 2: TOTO’s Installation Clearances

    From TOTO’s fit chart, “Washlet Installation Requirements”:

    Check TOTO requirement
    Front face of tank to center of mounting holes Minimum 2 in (50 mm) for S7A, S7, S5, S2, and KS6
    Distance between centers of seat mounting holes About 5-1/2 in (140 mm)
    Center of toilet to edge of flat bowl surface Minimum 8 in (203 mm)
    Power cord length 3.9 ft (1.2 m) on most models in the chart

    TOTO also warns that “some styles of toilets may not allow the WASHLET to fit properly due to certain contours where the tank meets the bowl.” Toilets with a curved or sculpted joint between tank and bowl are the most likely to cause trouble.

    Don’t forget the outlet. With a cord of about 3.9 ft, you need an outlet near the toilet. Check TOTO’s installation guide for electrical requirements.

    Step 3: Model Sizes (From TOTO’s Fit Chart)

    Model Shape Product size (from TOTO chart) Rated power
    S7A (SW4736/SW4734) Elongated 23-3/8” L x 17-5/8” W x 6-1/4” H 1290 W
    S7 (SW4726/SW4724) Elongated 23-3/8” L x 17-5/8” W x 6-1/4” H 1290 W
    S5 (SW3446) Elongated 15” W x 21” D x 5-1/2” H 1271 W
    S5 (SW3445) Round Size not clearly readable in chart* 1273 W
    S2 (SW3346) Elongated 18-7/16” W x 21” D x 5-1/2” H 1273 W
    S2 (SW3345) Round Size not clearly readable in chart* 1273 W
    KC2 (SW3024) Elongated 18-5/8” W x 20-7/8” D x 5-3/4” H 403 W
    KS6 (SW3946) Elongated 15-1/4” W x 20-13/16” D x 5-1/2” H 1278 W
    K300 (SW3036R) Elongated 15-1/8” W x 20-7/8” D x 5-3/16” H 1274 W
    A2 (SW3004) Elongated 18-5/8” W x 20-7/8” D x 6-5/8” H 287 W

    S5 and S2 sizes: the PDF’s columns don’t line up cleanly, so confirm these on each model’s TOTO spec sheet. *The PDF’s layout makes the round-model dimensions hard to read reliably, so I’ve left them out. Check TOTO’s spec sheet for each round model. TOTO notes that the KC2 and K300 are e-commerce only products.

    Where to buy: TOTO A2 SW3004 · TOTO S2 SW3346 · TOTO S5 SW3446 · TOTO S7 SW4726

    Step 4: Check TOTO’s Compatibility Chart for TOTO Toilets

    If you own a TOTO toilet, TOTO’s fit chart includes a compatibility grid. It covers one-piece, two-piece, and wall-hung TOTO toilets, such as the Drake, Ultramax, Aquia IV, and Nexus lines, matched against Washlet models. Some combinations need an extension kit:

    • THU9090R (marked * in the chart)
    • 9AU321-A (marked ** in the chart)

    Open the PDF and find your toilet’s name to confirm.

    Common Fit Problems

    • Wrong shape: an elongated seat on a round bowl will overhang the front.
    • Tank too close to the holes: under 2 inches of clearance can block the seat’s base for the models TOTO lists.
    • Narrow flat surface: under 8 inches from center can keep the seat from sitting flat.
    • No nearby outlet: a cord of about 3.9 ft won’t reach far.

    Once you know your bowl shape, compare models: TOTO A2 vs C2 for entry seats, or TOTO S7 vs S7A for the elongated-only S line.

    Check price of TOTO Washlet A2 on Amazon
    Check price of TOTO Washlet S2 on Amazon
    Check price of TOTO Washlet S5 on Amazon
    Check price of TOTO Washlet S7 on Amazon
    Check price of TOTO Washlet S7A on Amazon

    Fit, from the Japan Side

    Bidet seats are standard in Japan, and TOTO Japan approaches fit the same way it does in the US: you check the toilet’s measurements first. For its domestic Washlet Apricot, TOTO Japan says installing it on another maker’s toilet requires checking the bowl dimensions against its installation conditions, and part numbers differ by toilet type. That’s the same logic as the round vs elongated check above. Japanese-market Washlets are sized for Japanese toilets and 100 V power, so measure for the US model you’re actually buying rather than a Japanese spec sheet.

    Japanese reviewers of the current Apricot F3 on Kakaku.com often mention quieter operation and easier cleaning than older units; complaints include a motion sensor that may not react depending on where the door is, and a strongest spray some found weaker than before. (Third-party reviews, not our own testing.)

    Frequently Asked Questions

    How do I know if my toilet is round or elongated?

    Measure from the mounting holes to the front of the bowl. About 16.5 inches is round, and about 18.5 inches is elongated, per TOTO.

    Does a TOTO Washlet fit non-TOTO toilets?

    TOTO says a Washlet “will fit most North American toilets,” but toilets with unusual contours where the tank meets the bowl may not work. Check the clearances above.

    What is the minimum clearance from the tank?

    2 inches (50 mm) from the front of the tank to the center of the mounting holes, for the S7A, S7, S5, S2, and KS6, according to TOTO’s fit chart.

    Do I need an outlet next to the toilet?

    Yes. Washlets are electric, and the chart lists cords of about 3.9 ft (4 ft for the S7 and S7A).

    What is Washlet+?

    TOTO’s Washlet+ pairs a specially designed TOTO toilet with a Washlet+ seat, with no visible hoses or cords. It requires a compatible TOTO toilet.

    Which models come in round?

    In TOTO’s current fit chart, the S5 (SW3445) and S2 (SW3345) are listed as round. The other models in the chart are elongated.

    Check price of TOTO Washlet A2 on Amazon
    Check price of TOTO Washlet S2 on Amazon
    Check price of TOTO Washlet S5 on Amazon
    Check price of TOTO Washlet S7 on Amazon
    Check price of TOTO Washlet S7A on Amazon

    Sources

    Checked October 2026.

  • TOTO Washlet C5 Power Consumption: Watts and Yearly Cost

    TOTO Washlet C5 Power Consumption: Watts and Yearly Cost

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: TOTO rates the Washlet C5 (SW3084) at 403 W, with a 512 W maximum, but those are peak ratings, not all-day draw. TOTO doesn’t publish annual kWh. Based on one owner’s published measurement (about 0.08 kWh a day, seat heater off) and July 2026 US average prices, that’s roughly $5 a year.

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official documentation), all listed under Sources below. Cost or usage estimates use the third-party data cited there. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where bidet seats are so common that “how much electricity does it use?” is a routine question in household money-saving guides.

    I haven’t measured a C5 myself. The specs below come from TOTO USA’s official instruction manual. The yearly estimate uses a third-party measurement, and I label it clearly.

    C5 Power Specs (From TOTO’s Manual)

    Item TOTO Washlet C5 (SW3084)
    Rated power supply AC 120 V, 60 Hz
    Rated power consumption 403 W
    Maximum power consumption 512 W (warm water or heated seat)
    Water heater Tank type, approx. 0.13 gal (0.49 L)
    Water heater capacity 225 W
    Heated seat heater capacity 48 W
    Warm air dryer heater capacity 347 W
    Deodorizer power Approx. 1.7 W (normal), 5.3 W (power mode)
    Seat temperature in auto energy saver About 79 °F (26 °C)
    Energy-saver timer 6 or 9 hours (TOTO comparison chart)
    Auto energy saver Yes
    Power cord 3.93 ft (1.2 m)
    Where to buy TOTO C5 SW3084

    Why 403 W Doesn’t Mean 403 W All Day

    The rating reflects what the seat can draw when its heaters run. The C5 has separate heaters for the water tank (225 W), the seat (48 W), and the dryer (347 W).

    Here’s what that means in practice:

    • The dryer only runs for short periods while you use it.
    • The water tank heats a small reservoir (about 0.13 gal) and then holds it at temperature.
    • The seat heater is the part most likely to run for long stretches.

    That’s why actual daily use is far below 403 W multiplied by 24 hours.

    Yearly Cost Estimate

    TOTO doesn’t publish annual energy use for the C5. The best real-world figure I found comes from a C5 owner who measured his seat: about 80 watt-hours (0.08 kWh) a day, with the seat heater off, and once-a-day bidet use. (Nelson Minar’s blog)

    Using that one measurement:

    Step Value
    Daily use (third-party measurement) 0.08 kWh
    Yearly use (x 365) 29.2 kWh
    US average residential price, July 2026 (EIA) 18.31 cents/kWh
    Estimated yearly cost about $5.35

    Important caveats:

    • This is one household’s measurement, taken with the seat heater off. With the heated seat on, expect more.
    • Electricity prices vary a lot by state. In the same EIA table, the July 2026 residential price was 33.61 cents/kWh in California and 13.71 cents/kWh in Tennessee.
    • Your usage, the room temperature, and your settings all change the result.

    Do your own math: kWh per day x 365 x your electric rate in dollars per kWh = yearly cost. Your utility bill shows your rate.

    How to Use Less Power

    TOTO’s documents list these built-in options:

    • Energy-saver timer (6 or 9 hours): lowers heating for set hours, such as overnight.
    • Auto energy saver: drops the seat to about 79 °F when the seat isn’t in use.
    • Turn off the seat heater in warm months. The manual lists the seat temperature as adjustable down to OFF.
    • Water temperature OFF: the manual also lists OFF in the water temperature range.

    For comparison, the S7 is rated at 1290 W because of its instantaneous heater; see TOTO C5 vs S7. I used the same EIA price for a rice cooker in NS-TSC10 power consumption.

    Check price of TOTO Washlet C5 on Amazon

    Power Saving: The Japanese Angle

    Power use is a selling point in Japan, where TOTO’s domestic Washlet Apricot advertises learning-based power saving: it remembers the hours when the toilet isn’t used and saves electricity during those periods, alongside an instant-heating seat. TOTO Japan also explains why tank-type (貯湯式) models like the C5 draw standby power: they keep a reservoir of water warm, while instant-heating (瞬間式) models heat water only on demand. Japanese models are built for 100 V, so their wattage figures don’t transfer directly to US 120 V units; use the C5 manual figures above for US cost estimates.

    Japanese reviewers on Kakaku.com often mention that the Apricot is quiet and easy to clean, and some say its power-saving and auto-lid features are a reason to choose it; others find the settings hard to figure out. (Third-party reviews, not our own testing.)

    TOTO Washlet C5 Power Consumption: Frequently Asked Questions

    How many watts does the TOTO C5 use?

    TOTO lists 403 W rated power consumption and 512 W maximum.

    How much does a TOTO C5 cost to run per year?

    TOTO doesn’t publish this. Using one owner’s measurement of 0.08 kWh/day (seat heater off) and EIA’s July 2026 US residential average of 18.31 cents/kWh, it comes to about $5 a year. Heated seat use will raise it.

    Does the C5 have an energy saving mode?

    Yes. It has an energy-saver timer (6 or 9 hours) and an auto energy saver.

    Is the C5 water heater tankless?

    No. The C5 uses a tank-type heater of about 0.13 gallons.

    Do I need a special outlet?

    TOTO lists AC 120 V, 60 Hz and a 3.93 ft cord. Check TOTO’s installation guide for outlet requirements (for example, GFCI) before installing.

    Is the C5 still available?

    TOTO USA still has a C5 product page, but a third-party review site reports it as discontinued. Check current stock.

    Check price of TOTO Washlet C5 on Amazon

    Sources

    Checked October 2026.

  • TOTO Washlet C2 vs C5: What’s Actually Different?

    TOTO Washlet C2 vs C5: What’s Actually Different?

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: on TOTO’s official comparison chart, the C2 and C5 share the same wash, dryer, deodorizer, PREMIST, and EWATER+ features. The main difference is controls: the C2 has a side panel, while the C5 has a wireless remote with an illuminated touchpad. TOTO’s manuals also list the C5 body as narrower (383 mm vs 472 mm wide).

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official product page), all listed under Sources below. Cost or usage estimates use the third-party data cited there. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where bidet seats with wall-mounted remotes are common in newer homes.

    I haven’t installed either seat. This comparison uses TOTO USA’s comparison chart and official instruction manuals.

    Quick Comparison Table

    Feature TOTO C2 (SW3074) TOTO C5 (SW3084)
    Controls Side panel Wireless remote (illuminated touchpad)
    Shape Elongated Elongated
    Rear / soft rear / front Yes / Yes / Yes Yes / Yes / Yes
    Oscillating / pulsating Yes / Yes Yes / Yes
    Water pressure settings 5 5
    Water temperature settings 3 3
    Heated seat (settings) Yes (3) Yes (3)
    Warm-air dryer Yes Yes
    Air temperature settings 3 (TOTO chart) 3 (TOTO chart)
    Deodorizer Yes Yes
    PREMIST Yes Yes
    EWATER+ Yes (wand) Yes (wand)
    Energy-saver timer 6, 9 hours 6, 9 hours
    Rated / max power 403 W / 512 W 403 W / 512 W
    Water heater Tank type Tank (0.13 gal)
    Dimensions (manual) W 472 x D 530 x H 147 mm W 383 x D 530 x H 147 mm
    Weight (manual) About 11 lb Not captured in my check*
    Where to buy TOTO C2 SW3074 TOTO C5 SW3084

    *I couldn’t confirm the C5’s weight from the official manual excerpt, so it’s left out.

    Key differences at a glance

    • Controls: The C2 uses a side control panel on the seat, while the C5 uses a wireless remote with an illuminated touchpad.
    • Body width: TOTO’s manuals list the C5 at 383 mm wide, narrower than the C2’s 472 mm.
    • What stays the same: TOTO’s chart shows the same spray, seat, dryer, deodorizer, PREMIST, EWATER+, and energy-saving features, and the same 403 W rating (512 W max).

    The Differences

    1. Remote vs side panel

    This is the difference you’ll notice every day. The C2’s controls sit on an arm panel attached to the seat. The C5 uses a slim wireless remote with an illuminated touchpad, according to TOTO’s C5 product page.

    A wall-mounted remote keeps the side of the seat clear and is easier to read in a dim bathroom.

    2. Body width

    TOTO’s manuals list the C2 at W 472 mm and the C5 at W 383 mm. Depth and height are the same (530 mm and 147 mm). The C2’s extra width is likely from the side control panel, but TOTO doesn’t explicitly say so.

    3. Everything else is the same on the chart

    The chart shows the same features for both:

    • Spray modes and settings
    • Heated seat settings
    • Dryer and deodorizer
    • PREMIST and EWATER+
    • Energy saving

    Power ratings are also identical, 403 W rated and 512 W max.

    Note on Settings: 3 or 5?

    TOTO’s current online comparison chart lists 3 air temperature settings for both models. TOTO’s C5 product page also says “three variable temperature settings” for the dryer. Some spec sheets hosted by third-party retailers say “five.” I’ve used TOTO’s own pages here.

    Availability

    TOTO’s current Washlet fit chart PDF doesn’t list the C2 or C5. Both still have pages on TOTO’s site. A third-party review site (BidetScout) describes the C5 as discontinued and replaced by the S5. TOTO doesn’t state that on the pages I checked, so treat it as unconfirmed. Check stock and the seller before ordering.

    Who Should Buy Which?

    Choose the C2 if you:

    • Are fine with side-panel controls
    • Want the same wash and hygiene features at the lower model tier

    Choose the C5 if you:

    • Want a wireless remote you can mount on the wall
    • Prefer a narrower seat body (383 mm vs 472 mm)

    If you want instant water heating and 5-level settings, the next step up is covered in TOTO C5 vs S7. I also estimated the C5’s yearly electricity cost in TOTO Washlet C5 power consumption.

    Check price of TOTO Washlet C2 on Amazon
    Check price of TOTO Washlet C5 on Amazon

    Instant vs Tank Heating: TOTO Japan’s Explanation

    TOTO Japan sorts Washlets into instant-heating (瞬間式) and tank-type (貯湯式) models, and explains the trade-off plainly: tank models keep a reservoir of warm water, while instant models heat water only when you use them. TOTO also notes that with instant models, in winter or when water is cold, it can take longer for the nozzle to extend after you press the wash button. The C2 and C5 are US-market models; Japan’s lineup uses different names, with the Washlet Apricot at the top. Japanese units are built for 100 V and Japanese toilets.

    Japanese reviewers of the current Apricot F3 on Kakaku.com often mention quieter operation and easier cleaning than older units; complaints include a motion sensor that may not react depending on where the door is, and a strongest spray some found weaker than before. (Third-party reviews, not our own testing.)

    Washlet C2 vs C5: Frequently Asked Questions

    What’s the difference between the TOTO C2 and C5?

    Mainly the controls. The C2 uses a side panel and the C5 uses a wireless remote. The C5 body is also listed as narrower in TOTO’s manuals.

    Do the C2 and C5 have the same features?

    On TOTO USA’s comparison chart, yes. Spray, dryer, deodorizer, heated seat, PREMIST, and EWATER+ are the same.

    Do they use the same power?

    Yes. Both list 403 W rated and 512 W maximum.

    Are the C2 and C5 still sold?

    They still have pages on TOTO USA, but they’re missing from TOTO’s current fit chart, and a third-party site reports the C5 as discontinued. Check current availability.

    Do they fit round toilets?

    Both are listed as elongated models.

    Check price of TOTO Washlet C2 on Amazon
    Check price of TOTO Washlet C5 on Amazon

    Sources

    Specs checked October 2026.

  • TOTO Washlet A2 vs C2: Is the C2 Worth the Upgrade?

    TOTO Washlet A2 vs C2: Is the C2 Worth the Upgrade?

    As an Amazon Associate, TidyJapan earns from qualifying purchases. Links marked ‘Check price’ are affiliate links.

    Short answer: the C2 is worth it if you want a warm-air dryer, a deodorizer, and the extra hygiene features (PREMIST bowl mist and EWATER+ wand cleaning), because the A2 has none of them. If all you need is a warm-water wash and a heated seat with side-panel controls, the A2 covers that.

    How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with TOTO USA’s official product page), all listed under Sources below. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

    I live in Japan, where TOTO bidet seats are a normal part of everyday life. You find them in homes, train stations, and shopping malls.

    I haven’t installed or tested these two US models. This comparison uses only TOTO USA’s official comparison chart, fit chart, and instruction manual, all linked at the end.

    Quick Comparison Table

    Feature TOTO Washlet A2 (SW3004) TOTO Washlet C2 (SW3074)
    Shape Elongated Elongated
    Controls Side panel Side panel
    Rear / soft rear / front cleanse Yes / Yes / Yes Yes / Yes / Yes
    Oscillating cleanse Yes Yes
    Pulsating cleanse No Yes
    Water pressure settings 5 5
    Water temperature settings 3 3
    Heated seat (settings) Yes (3) Yes (3)
    Warm-air dryer No Yes (3 temperature settings on TOTO’s comparison chart*)
    Deodorizer No Yes
    PREMIST (bowl mist) No Yes
    EWATER+ No Yes (wand)
    Self-cleaning wand Yes Yes
    Soft-close seat and lid Yes Yes
    Energy-saver timer 6, 9 hours 6, 9 hours
    Rated power 287 W 403 W (max 512 W)
    Product size 18-5/8” W x 20-7/8” D x 6-5/8” H W 472 mm x D 530 mm x H 147 mm (manual)
    Power cord 3.9 ft (1.2 m) 3.9 ft (1.2 m)
    Water heater type Not stated in chart Tank type
    Where to buy TOTO A2 SW3004 TOTO C2 SW3074

    *TOTO’s online comparison chart shows 3 air temperature settings for the C2, while some third-party copies of the C2 spec sheet describe “five variable temperature settings.” The official chart is used here. Check the current listing.

    Key differences at a glance

    • Warm-air dryer: The C2 has a warm-air dryer (about 95–140 °F per TOTO’s manual), and the A2 has none.
    • Deodorizer: The C2 has an automatic air deodorizer, and the A2 does not.
    • Hygiene features: The C2 adds PREMIST, which mists the bowl before use, and EWATER+, which cleans the wand; the A2 has neither.
    • Spray modes: Both have oscillating spray, but only the C2 adds pulsating spray.
    • What stays the same: Both share rear, soft rear, and front cleanse, 5 pressure and 3 water temperature settings, a 3-setting heated seat, side-panel controls, a soft-close lid, and an energy-saver timer.

    What You Get by Upgrading to the C2

    1. A warm-air dryer

    The A2 has no dryer. The C2 does, and TOTO’s manual lists the dryer’s air temperature range as about 95–140 °F.

    TOTO pitches the dryer as a way to reduce how much toilet paper you need. For many buyers this is the single biggest reason to step up.

    2. A deodorizer

    The C2 has an automatic air deodorizer. The A2 doesn’t.

    3. PREMIST and EWATER+

    These two hygiene features are C2-only between this pair:

    • PREMIST mists the bowl before use.
    • EWATER+ cleans the wand.

    Both models have a self-cleaning wand and a wand cleaning mode, but the A2 lacks the EWATER+ system.

    4. Pulsating spray

    Both have oscillating spray. Only the C2 adds pulsating spray.

    What stays the same

    You don’t gain anything in the basics. Both have the same:

    • Rear, soft rear, and front cleanse
    • 5 water pressure settings
    • 3 water temperature settings
    • 3-setting heated seat
    • Side-panel controls
    • Soft-close lid
    • Energy-saver timer

    Power and Size

    TOTO lists rated power of 287 W for the A2 and 403 W for the C2. The C2 manual adds a 512 W maximum for warm water or the heated seat.

    These are rated figures, not annual usage. TOTO doesn’t publish yearly kWh on these documents, so I won’t estimate an electricity bill.

    Size is listed differently for each:

    • A2: 18-5/8” W x 20-7/8” D x 6-5/8” H (TOTO fit chart)
    • C2: W 472 mm x D 530 mm x H 147 mm (about W 1.55 ft x D 1.74 ft x H 0.48 ft, TOTO instruction manual)

    Both are elongated seats. TOTO defines elongated as about 18.5 inches from the mounting holes to the front of the bowl, versus 16.5 inches for round. Measure your toilet before buying.

    Who Should Buy Which?

    Choose the A2 if you:

    • Just want a warm-water wash plus a heated seat
    • Don’t care about a dryer or deodorizer
    • Want the lower rated power (287 W)

    Choose the C2 if you:

    • Want a warm-air dryer to cut toilet paper use
    • Want a deodorizer
    • Value PREMIST and EWATER+ for keeping things cleaner
    • Like having pulsating spray

    One thing to check before buying: TOTO’s current Washlet fit chart PDF lists the A2 but not the C2. TOTO’s comparison page still shows the C2. Confirm the C2 is still available new before you order.

    If the C2 looks right, the next decision is usually controls; see TOTO C2 vs C5. Before ordering either seat, check the measurements in which TOTO Washlet fits my toilet.

    Check price of TOTO Washlet A2 on Amazon
    Check price of TOTO Washlet C2 on Amazon

    A Japan-Side Note on Washlets

    In Japan, “Washlet” is TOTO’s brand name, and the domestic lineup is entirely different from the US A2 and C2. TOTO Japan’s top bidet-seat line is the Washlet Apricot, which uses instant (瞬間式) heating, offers colors like pastel ivory and pastel pink, and adds electrolyzed “kirei jokin-sui” water to clean the bowl and nozzle. TOTO Japan also notes a quirk of instant heating: in winter, when water is cold, the nozzle can take longer to start. Japanese models are designed for Japanese toilets and 100 V power, so stick with US-listed models like the A2 and C2.

    Japanese reviewers of the current Apricot F3 on Kakaku.com often mention quieter operation and easier cleaning than older units; complaints include a motion sensor that may not react depending on where the door is, and a strongest spray some found weaker than before. (Third-party reviews, not our own testing.)

    Washlet A2 vs C2: Frequently Asked Questions

    Does the TOTO A2 have a dryer?

    No. TOTO’s comparison chart shows no air dryer and no deodorizer for the A2 (SW3004).

    What does the C2 add over the A2?

    A warm-air dryer, a deodorizer, PREMIST, EWATER+ (wand), and pulsating spray, according to TOTO USA’s comparison chart.

    Do both use side-panel controls?

    Yes. Neither the A2 nor the C2 has a wireless remote. In this lineup, the C5 is the step up with a remote.

    Will the A2 or C2 fit a round toilet?

    Both are listed as elongated. TOTO’s elongated seats are about 18.5 inches from the mounting holes to the front of the bowl, while round toilets are 16.5 inches.

    How much power do they use?

    TOTO lists rated power of 287 W (A2) and 403 W (C2, 512 W maximum). Actual yearly energy use isn’t published in these documents.

    Do both have a heated seat?

    Yes. Each has a heated seat with 3 temperature settings.

    Check price of TOTO Washlet A2 on Amazon
    Check price of TOTO Washlet C2 on Amazon

    Sources

    Specs checked October 2026.