WATER HEATER

To suppress deterioration of bactericidal effects of a sterilizer provided in a water heater.SOLUTION: A water heater includes: a hot water storage tank 10 storing water; and a bathtub circulation circuit taking out water from a bathtub 200 and returning the water to the bathtub 200 via a bath heat exchanger 15. The water heater also includes an LED sterilizer 20 having an LED light source and irradiating water flowing in the bathtub circulation circuit with ultraviolet rays. The water heater further includes a cooling circuit having bypass piping 33 thermally connected to the LED sterilizer 20 to cool the LED sterilizer 20 and a first pump 11 taking out water stored in a lower part of the hot water storage tank 10 and returning the water to the hot water storage tank 10 via the bypass piping 33.SELECTED DRAWING: Figure 1 【課題】給湯装置に備えられた殺菌装置の殺菌効果の低下を抑制する。【解決手段】給湯装置は、水を貯める貯湯タンク１０と、浴槽２００から水を取り出して風呂熱交換器１５を経由して浴槽２００へ戻す浴槽循環回路と、を備える。また、給湯装置は、ＬＥＤ光源を有し、浴槽循環回路を流れる水に紫外線を照射するＬＥＤ殺菌装置２０を備える。給湯装置は、更に、ＬＥＤ殺菌装置２０に熱的に接続してＬＥＤ殺菌装置２０を冷却するバイパス配管３３と、貯湯タンク１０の下部に貯められた水を取り出してバイパス配管３３を経由して貯湯タンク１０に戻す第一ポンプ１１と、を含む冷却回路を備える。【選択図】図１