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

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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

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.

Related comparisons

• TOTO Washlet C5 vs S7: Tank or Instant Heating?
• TOTO Washlet C2 vs C5: What’s Actually Different?
• Will a TOTO Washlet Fit My Toilet? Round vs Elongated
• TOTO Washlet C5 Power Consumption: Watts and Yearly Cost

Sources

• TOTO USA, WASHLET S7 Elongated spec sheet SS-02227 (PDF): https://www.totousa.com/filemanager_uploads/product_assets/SpecSheet/SS-02227_SW4726(AT40)_SW4724(AT40).pdf
• TOTO USA, WASHLET S7A Elongated spec sheet SS-02228 (PDF): https://www.totousa.com/filemanager_uploads/product_assets/SpecSheet/SS-02228_SW4736(AT40)_SW4734(AT40).pdf
• TOTO USA, WASHLET Bidet Comparison Chart: https://www.totousa.com/washlet-new
• TOTO USA, S7/S7A parts manual (model numbers): https://www.totousa.com/filemanager_uploads/product_assets/PartsManual/PD-01521_SW4724_26_34_36.pdf
• TOTO Japan: Washlet Apricot product page (jp.toto.com): https://jp.toto.com/products/toilet/apricot/
• Kakaku.com user reviews: TOTO Apricot F3 (Japanese): https://review.kakaku.com/review/J0000042091/
• Kakaku.com: TOTO Apricot F3A reviews (Japanese): https://kakaku.com/item/J0000042092/

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