Toilets in Japan: Squat toilet, Washlet and Warmlet

Toilets in Japan are generally more advanced than toilets in other developed nations. There are two styles of toilets commonly found in Japan;^[1][2] the oldest type is a simple squat toilet, which is still somewhat common in public conveniences.

After World War II, modern Western-type flush toilets and urinals became common. The current state of the art for Western-style toilets is the bidet toilet, which, as of March 2010, is installed in 72% of Japanese households.^[3][4][5][6] In Japan, these bidets are commonly called washlets, a brand name of Toto Ltd., and include many advanced features rarely seen outside of Asia. The feature set commonly found on washlets are anus washing, bidet washing, seat warming, and deodorization.

Washlet (ウォシュレット Woshuretto^?) is a registered trademark of the Japanese toilet company Toto, referring to electric toilet seats with water spray feature for washing.

While it is commonplace at toilets in Japan, the term washlet may be used colloquially to refer to non-Toto seats with comparable features. The washing feature includes anal and genital cleansing. The buttons associated with operating these features are labeled "oshiri" (bottom) and "bidet".
Some models have a sensor that prevents spraying water when a person is not sitting on the toilet. In order to determine the appropriate spray position, Toto surveyed 300 male and female employees during development.^{[citation needed]}

Washlets offer several features, including electric seat heating. The product line with only the heating feature are called warmlets by Toto.

The Toto Washlet range of toilets and accessories include integrated bidet toilet seats, as well as add-on bidet seats for upgrading a standard toilet. The Toto Washlet S300 is one such seat. This seat features a heated seat, retractable cleaning wands, warm water massage, warm air drying, and a built in automatic deodorizer. A digital thermostat and an automatic opening and closing toilet seat are additional features.
The Washlet range also include a number of lower-priced models such as the Washlet C110.