heated bathwater; hot water for bathing
Often refers to cold mineral spring water that has been heated to a suitable bathing temperature, as opposed to naturally hot spring water.
The heated bathwater at this inn is made by warming cold mineral spring water.
Heated bathwater feels different on the skin compared to natural hot spring water.
Standard kanji spelling.
Mixed kana-kanji spelling; less common but still encountered.
Compound of 沸かし (wakashi, the continuative form of 沸かす 'to boil/heat') and 湯 (yu, 'hot water').