also: すいぶろ
noun
Edo-period bathtub heated from below
Historical term for a type of bathtub used in the Edo period, heated by a fire built underneath. Not used in modern daily life.
See also: 据え風呂
The Edo-period mizuburo was a type of fixed bathtub heated by a fire built underneath.
据え風呂 is a broader term for a fixed, non-portable bathtub; 水風呂 specifically refers to the type heated from below, often associated with the Edo period.
Compound of 水 (mizu, 'water') and 風呂 (furo, 'bath'). The exact historical derivation is uncertain; the term refers to a bathtub where water was heated directly by a fire underneath.