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.he 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.