PROBLEM TO BE SOLVED: To provide a highly usable hot water supply apparatus that can supply an ingredient for the purpose of improvement of water at a predetermined amount and discharge water inside a water improving unit.SOLUTION: The hot water supply apparatus includes: a bathtub water circulation circuit 15 in which hot water in a bathtub 14 circulates a bathtub water circulation pump 16 for circulating the hot water in the bathtub water circulation circuit 15 the water improving unit 21 for adding a function improving ingredient to the hot water supplied to the bathtub water circulation circuit 15 and a water discharge opening/closing unit 22 for communicating between the inside of the water improving unit 21 and the atmosphere when opened. In the hot water supply apparatus, the water discharge opening/closing unit 22 is arranged under the water improving unit 21 and the bathtub water circulation pump 16, and water inside the water improving unit 21 and the water inside the bathtub water circulation pump 16 are also reliably discharged.COPYRIGHT: (C)2013,JPO&INPIT【課題】水改質を目的とした成分を所定量供給することができ、かつ、水改質手段内部の水を排出することができる使用性の高い給湯装置を提供する。【解決手段】浴槽14内の湯水が循環する浴槽水循環回路15と、浴槽水循環回路15にて湯水を循環させる浴槽水循環ポンプ16と、浴槽水循環回路15に供給する湯水に機能改質成分を添加する水改質手段21と、開時、水改質手段21内部と大気とを連通させる排水開閉手段22とを備え、排水開閉手段22を、水改質手段21及び浴槽水循環ポンプ16より下方に配設した給湯装置で、水改質手段21内部の水および浴槽水循環ポンプ16内部の水も確実に排出する。【選択図】図1
