TOTO Auto-Flush Kit THU857 for Washlet S7A/S7 - Single Flush Toilets

We installed the THU857 ourselves—it was very easy and works great. We disabled the auto-flush feature (via a button on the back of the remote) because we prefer to flush manually using the new button included with the kit to add to the remote control. This beats using the toilet lever. That said, the default setting is auto-flush if that’s what you want so it flushes when you get up off the seat and no button presses needed. And you can customize the delay to certain times to flush after you get up.

One minor issue: the instructions mention connecting the water feed hose to either a white or black port on the new 857 based on hose length, but there’s only a single black port. We just used that, and everything works fine.

A heads-up: the Toto S7 remote triggered our Simplehuman touch-free soap dispenser — likely due to overlapping infrared frequencies—causing soap to squirt unexpectedly. We replaced it with the Umbra Otto Automatic Touchless soap dispenser, which isn’t quite as sleek but doesn’t react to the remote.

Premier Bidets was excellent—low prices, fast shipping, and great customer service. They confirmed compatibility, answered questions about the auto-flush settings, and made sure we had what we needed. Highly recommend and would buy from them again.

I wrote on March 5, 2025, that the flush button attached to the remote control didn't arrive in the box. To this day, I haven't received a solution. Without the flush button, I can't use the purchased equipment. Mr. Valdez told me they had written to Toto, but I didn't make the purchase from Toto, but from Bidets Premier.

I couldn’t be happier with my experience shopping at PremierBidets.com! From start to finish, they exceeded my expectations. The **shipping was incredibly fast**, and I received my order much sooner than anticipated.

What really stood out was their **responsive and friendly customer service**—every question I had was answered promptly and professionally. It’s rare to find a company that truly prioritizes its customers, and Premier Bidets delivers on that promise.

Additionally, their **return process was hassle-free**, making me feel confident about my purchase. Their **competitive pricing** is the cherry on top—great value without compromising on quality!

If you're looking for a seamless shopping experience, look no further. I highly recommend PremierBidets.com and will definitely be a returning customer.

⭐️⭐️⭐️⭐️⭐️

Great auto flusher. Doesn’t it look nice

Installs easy and works as expected.
I have the TOTO S7 with a single flush Drake toilet. The S7 was trying to do a light flush when both seats were lifted. Had to call TOTO support to reset the S7 for single flush and all is well.

The steps provided by support were not in a manual that I could find.

Steps to reset S7 for single flush:
1. Hold Front Wash and + for 10 seconds
2. Press - > + > - (flashes twice, 2 long beeps)
3. Hold Front Wash and + for 10 seconds
4. Press Rear Wash > - > Rear Wash (Flashes twice, 2 long beeps = Complete.)