What is a Japanese washlet?

A washlet is an electronic toilet seat with a built-in water-jet wand that cleans the user after using the toilet. The original "Washlet" trademark belongs to TOTO, which launched the consumer version in 1980. Modern washlets typically include a heated seat, multiple water-jet pressure and angle settings, a warm-air dryer, deodorizer, and motion-activated flush.

What percentage of Japanese homes have a washlet?

Approximately 80% of Japanese households have a washlet-equipped toilet, according to Cabinet Office consumer durables surveys. This makes washlets more common in Japanese homes than dishwashers or clothes dryers, despite costing significantly more.

Where are washlets used outside the home in Japan?

Almost everywhere. Train stations, department stores, public restrooms, restaurants, hotels, hospitals, and most convenience stores feature washlet-equipped toilets. Visitors are likely to encounter washlets within an hour of arriving at a Japanese airport.

Today I Learned

Japan, apparently, has heated bidet toilets in 80% of homes

Toto's Washlet launched in 1980 and is now in roughly 80% of Japanese households. The control panel has more buttons than a microwave for a reason.

Published 2026-04-27 · 2 min read · By Daichi

◇ A Japanese Washlet toilet with an illuminated side control panel showing bidet, dryer, and seat-temperature buttons

The toilet has its own remote control

The first time a non-Japanese friend visited my parents’ house in Saitama, she came out of the bathroom holding her phone like a translator. “There are eleven buttons. One of them plays music.” That was a Toto Washlet, and roughly 80% of Japanese households have one too.

The fact

According to the Cabinet Office’s Consumer Confidence Survey on durable goods, warm-water-bidet toilet seats — colloquially “Washlet” after Toto’s brand — are installed in around 80% of Japanese households, which makes them more common than dishwashers, and far more common than dryers. Toto launched the Washlet G Series in 1980, marketed with a famous TV ad: “Oshiri datte, arattehoshii” — “Even your bottom wants to be washed.”

Standard features now include a heated seat, a warm-water rear and front bidet with adjustable pressure, a warm-air dryer, deodorizing fan, automatic lid, and — the part visitors fixate on — the Otohime (“Sound Princess”), a button that plays a flushing-water sound to mask other sounds.

Why it works this way

Three forces stacked:

Cold winters, no central heating. Most Japanese homes don’t heat unused rooms. A heated toilet seat in February is not a luxury — it’s the baseline that makes the bathroom usable.
The Otohime, born of embarrassment. Studies in the 1980s found women were flushing repeatedly in public restrooms to mask sound, wasting massive amounts of water. The Sound Princess solved a real public-utility problem.
Toto’s domestic dominance. Toto held the patents and the showroom-density of a cosmetics brand. Plumbing renovations defaulted to Washlet, and rentals followed.

The ergonomics also lean into a long Japanese habit of considering bathing and toileting as wellness, not just utility — see also: onsen culture, the furo-before-bed routine, ofuro heated remotely from the kitchen.

Where to experience it

Any modern home, hotel, or department store in Japan. Even highway service-area restrooms now have Washlets standard.
Toto Museum (Kitakyushu, Fukuoka) — actual museum about toilets. Free. Better than it sounds.
Haneda and Narita airports — first-time visitors should treat the airport restroom as the orientation session.

Closing

It is genuinely hard to go back. After a year abroad I started travelling with a portable battery-powered bidet, which is, apparently, the move of someone who grew up with the real thing.

Flagship guide: Japanese Bathroom Etiquette — onsen, sento, and the Washlet button you should not press in public.