noun
bath attendant; person in charge of heating and filling public baths
Historical occupation at public bathhouses (銭湯). The 湯番 was responsible for managing the fire, heating water, and maintaining the baths. The term is now mostly encountered in historical or period contexts.
江戸時代の銭湯には、湯番と呼ばれる人がいて、湯加減を見ていた。
In Edo-period public baths, there was a person called a 湯番 who checked the water temperature.