JP3913464B2

JP3913464B2 - Automatic bath equipment

Info

Publication number: JP3913464B2
Application number: JP2000370129A
Authority: JP
Inventors: 満永倉; 幸夫小林; 政人佐藤; 貴宏木村
Original assignee: Corona Corp
Current assignee: Corona Corp
Priority date: 2000-12-05
Filing date: 2000-12-05
Publication date: 2007-05-09
Anticipated expiration: 2020-12-05
Also published as: JP2002168520A

Description

【０００１】
【発明の属する技術分野】
この発明は、風呂の自動運転装置に関し、その予約タイマー手段の使用勝手を良くし、しかも省エネ性の向上を計ったものに関する。
【０００２】
【従来の技術】
従来よりこの種のものに於いては、例えば特公平２−５３６９６号公報に開示されている如く、予約時刻から予め定めた一定時間だけ遡って自動風呂運転を開始すると共に、沸き上げ完了後は予約時刻より一定時間だけ遡って保温運転を行い、予約時刻には風呂は確実に沸き上げられており、快適な入浴が得られるものであった。
【０００３】
【発明が解決しようとする課題】
ところでこの従来のものでは、予約時刻より一定時間だけ遡って保温運転を行い、予約時刻には常に設定湯温を維持しておくものであるが、普通予約時刻ピッタリに風呂に入る人は少なく、通常多くの人は予約時刻後にようやく入浴準備に入るものであり、予約時刻の一定時間前から保温運転をしたのでは、無駄なエネルギーを消費してしまうと言う結果となり、しかも保温運転でも追焚き運転直後と直前とでは大きな温度差があり、必ず設定温度の快適な入浴が得られるとはかぎらないものであった。
【０００４】
【課題を解決するための手段】
この発明はこの点に着目し上記課題を解決するため、特にその構成を、浴槽と風呂用熱交換器とを循環ポンプを備えた往管及び復管とで連通した風呂循環回路と、入水管と給湯用熱交換器と出湯管とを順に連結した給湯回路とを具備し、更に前記した風呂循環回路と給湯回路とは出湯管から分岐した湯張り回路で連通されたものに於いて、前記浴槽への湯張り回路を介した設定温度より低い所定温度の湯張り後、風呂循環回路による設定温度までの追焚き運転を行う自動風呂運転機能を備え、設定された時刻より一定時間前に前記自動風呂運転を行わせる予約タイマー手段を備えると共に、この予約タイマー手段は設定された時刻の到来で、所定時間間隔で風呂湯温を検知し設定温度以下では設定温度まで追い焚きし所定時間の間は風呂湯温を設定温度に保持する風呂の保温運転を開始させるようにしたものである。
【０００５】
又予約時刻到来による保温運転開始では、初回時のみ湯温が設定温度以上でも、一定時間循環ポンプを駆動させて、浴槽内の上下の湯温差をなくし均一にしておくようにしたものである。
【０００６】
【発明の実施の形態】
風呂予約スイッチ３１を押圧し予約状態とした後、入浴したい時刻を時、分スイッチ３２、３３で設定し、風呂予約スイッチ３１を再度押圧すれば、予約タイマー手段２８がスタートして現在時刻と予約時刻とを随時比較すると共に、この予約時刻から季節に関係なく該予約時刻前に必ず風呂を沸き上げることが出来る一定時間を差し引いた時刻を記憶し、この一定時間前時刻と現在時刻との比較も行うものである。
【０００７】
そして、一定時間前時刻の到来で予約タイマー手段２８は自動風呂運転を開始させ、予め使用者が設定した入浴設定温度より所定温度低い温度で、湯張り回路２３を介して給湯回路７から浴槽１７に設定量の湯張りを行った後、設定温度まで風呂循環回路１６で追焚きを行い、風呂を一旦沸き上げるものである。
【０００８】
次に予約時刻の到来で、予約タイマー手段２８は４時間の保温運転を開始させるものであり、即ち、先ず循環ポンプ２１を駆動し浴槽１７内の湯水を循環させて、風呂サーミスタ２０で現在湯温を検知し、この湯温が入浴設定温度以下では継続して循環ポンプ２１を駆動させながら追焚きを行い、設定温度に沸き上げるものであり、又湯温が入浴設定温度以上では、追焚きは行わず循環ポンプ２１の駆動を停止させるものであり、この作動を所定時間間隔で行い湯温を４時間は設定温度に保持するものであるが、予約時刻到来時の保温運転初回時のみ、湯温が入浴設定温度以上でも一定時間循環ポンプ２１の駆動を継続して、浴槽１７内の上下の温度差を緩和して快適な入浴が行えるようにするものである。
【０００９】
従って、予約時刻には風呂は一旦沸き上がっていることは勿論、予約時刻の到来で初めて保温運転を開始するので、無駄な保温運転がなく省エネルギーであると共に、予約時刻から入浴準備に入れば、丁度快適な入浴が行える確率が極めて高いものである。
【００１０】
【実施例】
次にこの発明に係る自動風呂装置を図面に示された一実施例で説明する。
１は自動風呂装置の本体で、給湯用熱交換器２及び風呂用熱交換器３とからなる熱交換器４が設けられている。
【００１１】
５は前記熱交換器４の下部に備えられた燃焼部で、石油気化式のバーナ６に送風機（図示せず）により燃焼用空気を送風すると共に、燃料ポンプ（図示せず）により燃油を供給することにより燃焼を行うものである。
【００１２】
７は入水管８から給湯用熱交換器２を経て出湯管９に至る給湯回路で、水道管１０に直結している入水管８から入水された水道水を給湯フローセンサ１１により空焚き防止のため通水検知し、給水サーミスタ１２にてその温度を検知し、給湯用熱交換器２にて熱交換した後、設定温度になるようにミキシング弁１３にて入水管８から入水された水道水の一部を混合し、給湯サーミスタ１４で出湯水の温度を検知して、出湯管９から接続されている水栓（図示せず）に向けて出湯するもので、更にミキシング弁１３の下流側には断続して給湯した場合の湯温ムラを防ぐための水比例弁１５を設けたものである。
【００１３】
１６は浴槽１７から往管１８を通り、風呂用熱交換器３を経て復管１９を通って再び浴槽１７に至る風呂循環回路で、浴槽１７から往管１８を通って風呂用熱交換器３に流入する浴槽水の温度を検知する風呂サーミスタ２０と、往管１８と風呂用熱交換器３との間に位置して風呂循環回路１６内に浴槽水を循環させる循環ポンプ２１と、風呂用熱交換器３と復管１９との間に位置して、空焚き防止のため浴槽水の水流を検知する流水スイッチ２２とを備えたものである。
【００１４】
２３は一端を給湯口９と給湯サーミスタ１４との間の給湯回路７と接続し、他端を三方弁２４を介してから往管１８を通り、風呂用熱交換器３を経て復管１９を通って再び浴槽１７に循環ポンプ２１と風呂用熱交換器３との間の風呂循環回路１６と接続した湯張り回路で、給湯回路７と湯張り回路２３との開通及び不通は電磁弁２５の開閉により行い、風呂循環回路１６と湯張り回路２３との開通及び不通は三方弁２４の動作により行い、給湯回路７から供給されたお湯を湯張りフローセンサ２６により通水検知し、また、逆止弁２７にて風呂循環回路１６内の浴槽水が給湯回路７内に流れるのを防止しているものである。
【００１５】
２８はマイコン２９内の機能としての予約タイマー手段で、リモコン３０に備えられた風呂予約スイッチ３１の一回目の押圧で待機状態となり、時スイッチ３２及び分スイッチ３３を表示部３４を見ながら操作して、希望する入浴時刻をセットし、再び風呂予約スイッチ３１を押圧することで、この入浴時刻を記憶すると共に、現在時刻との比較を計時開始する。
【００１６】
又この予約タイマー手段２８は、別に入浴時刻から季節に関係なく確実に風呂を沸き上げることが出来る一定時間を差し引いた時刻も演算記憶し、この時刻の到来で浴槽１７への設定温度より低い所定温度の湯張り後、設定温度への追焚きを行う自動風呂運転を行わせるものであり、更に設定した入浴時刻の到来初めて４時間の保温運転をスタートさせ、しかもこの時浴槽１７内の湯温が設定温度以上では循環ポンプ２１の駆動を一定時間継続した後に停止させるものである。
【００１７】
次にこの発明一実施例の作動について、図３のフローチャートに従って説明する。
先ず入浴設定温度をセットした後、前記した如く時、分スイッチ３２、３３で希望する入浴時刻をセットし、風呂予約スイッチ３１を押圧すれば予約タイマー運転がスタートして、予約タイマー手段２８では設定された入浴時刻から一定時間を差し引いた時刻に現在時刻が達したかを判断する。（ステップ３５）
【００１８】
そして、ＹＥＳでステップ３６に進み三方弁２４及び電磁弁２５に通電すると共に、燃焼部５の燃焼を開始させ、給湯回路７の給湯を湯張り回路２３を介して湯張り開始され、ステップ３７で設定温度より数度低い所定温度の温水を所定量浴槽１７に湯張りして湯張りを終了させ、ステップ３８に進み循環ポンプ２１を駆動させて浴槽１７内の湯水を風呂循環回路１６に循環させ設定温度まで加温し、設定温度に達することでこの駆動を停止してステップ３９で追焚き終了し、希望入浴時刻前には一旦必ず風呂は沸き上がっているものである。
【００１９】
次にステップ４０で予約タイマー手段２８は、予約時刻の到来を待ちＹＥＳでステップ４１に進んで循環ポンプ２１を駆動させ、ステップ４２で風呂湯温が設定温度以下かを判断し、即ち沸き上げ後時間がたって予約した入浴時刻には、湯温が設定温度以下に低下した時には、ＹＥＳでステップ４３に進み再び追焚きを行い、設定温度まで湯温が上昇したかをステップ４４で判断し、ＹＥＳでステップ４５に進んで追焚きを終了すると共に、循環ポンプ２１の駆動も停止させるものである。
【００２０】
更にステップ４２でＮＯの時、即ち風呂の沸き上げからそれ程時間がたっておらず、風呂湯温が設定温度以上の場合には、ステップ４６で先ず循環ポンプ２１の駆動が風呂予約の保温運転の初回かを判断し、ＹＥＳでステップ４７に進み循環ポンプ２１を５分〜１０分の一定時間継続して駆動させて、浴槽１７内の上下の温度差をなくし快適な入浴が得られるようにしているものであり、この一定時間後及び前記のステップ４６でＮＯでは、ステップ４８に進み循環ポンプ２１は停止するものである。
【００２１】
そして、ステップ４５及びステップ４８の次に共に同じステップ４９に進み、保温運転の開始から４時間が経過したかを判断し、ＮＯではステップ５０に進んで、循環ポンプ２１停止から一定時間の３０分が経過したかを判断して、ＹＥＳで再びステップ４１に戻って循環ポンプ２１を駆動させるものであり、即ち循環ポンプ２１を駆動しての風呂湯温の検知を一定時間間隔で行っているものであり、又ステップ４９で４時間が経過してのＹＥＳでは、この風呂予約からの保温運転を停止するものである。
【００２２】
従って、入浴予約時刻には一旦沸き上がった風呂の保温運転が開始され、入浴準備後入浴することで、設定温度の湯温での入浴が行える確率が極めて高く、常に良好な入浴が行えると共に、無駄なエネルギー消費がなく省エネルギーの自動風呂運転が得られるものである。
【００２３】
更に予約時刻の保温運転開始の初回のみ風呂湯温が設定温度に達していた時には、循環ポンプを一定時間駆動させてから停止させるので、浴槽内の上下の温度差がなくなり快適な入浴が行えるものである。
【００２４】
【発明の効果】
要するにこの発明によれば、入浴予約時刻には一旦沸き上がった風呂の保温運転が開始され、入浴準備後入浴することで、設定温度の湯温での入浴が行える確率が極めて高く、常に良好な入浴が行えると共に、無駄なエネルギー消費がなく省エネルギーの自動風呂運転が得られるものである。
【００２５】
又この発明の請求項２によれば、予約時刻の保温運転開始の初回のみ風呂湯温が設定温度に達していた時には、循環ポンプを一定時間駆動させてから停止させるので、浴槽内の上下の温度差がなくなり快適な入浴が行えるものである。
【図面の簡単な説明】
【図１】この発明の一実施例を付した自動風呂装置の概略構成図。
【図２】同要部電気回路のブロック図。
【図３】同要部のフローチャート。
【符号の説明】
２給湯用熱交換器
３風呂用熱交換器
７給湯回路
８入水管
９出湯管
１６風呂循環回路
１７浴槽
１８往管
１９復管
２１循環ポンプ
２３湯張り回路
２８予約タイマー手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic bath driving apparatus, and more particularly to an apparatus for improving the energy saving performance of the reservation timer means.
[0002]
[Prior art]
Conventionally, in this kind of thing, as disclosed in, for example, Japanese Patent Publication No. 2-53696, the automatic bath operation is started by going back a predetermined time from the reservation time, and after the boiling is completed, The bath was kept warm by going back a certain time from the reservation time, and the bath was surely boiled at the reservation time, so that a comfortable bathing was obtained.
[0003]
[Problems to be solved by the invention]
By the way, with this conventional one, the heat insulation operation is performed by going back a certain time from the reservation time, and the set hot water temperature is always maintained at the reservation time, but there are few people who take a bath perfectly at the normal reservation time, Usually, many people will finally start preparing for bathing after the reservation time, and if they are kept warm from a certain time before the scheduled time, it will result in wasting unnecessary energy, and they will also be chased by warming up. There was a large temperature difference between immediately after operation and immediately before operation, and it was not always possible to obtain a comfortable bath at a set temperature.
[0004]
[Means for Solving the Problems]
This invention pays attention to this point and solves the above-mentioned problems. In particular, the structure is composed of a bath circulation circuit in which a bathtub and a heat exchanger for bath communicate with an outgoing pipe and a return pipe provided with a circulation pump, and a water inlet pipe. A hot water supply circuit in which a hot water supply heat exchanger and a hot water discharge pipe are connected in order, and the bath circulation circuit and the hot water supply circuit are communicated by a hot water filling circuit branched from the hot water supply pipe. It is equipped with an automatic bath operation function that performs a reheating operation up to the set temperature by the bath circulation circuit after filling a predetermined temperature lower than the set temperature through the hot water filling circuit to the bathtub, and a predetermined time before the set time Reservation timer means for performing automatic bath operation is provided, and this reservation timer means detects the bath water temperature at a predetermined time interval when the set time arrives, and drives back to the set temperature below the set temperature for a predetermined time. Is the bath temperature Retaining the set temperature is obtained so as to initiate the maintenance operation of the bath.
[0005]
In addition, at the start of the heat insulation operation due to the arrival of the reservation time, even if the hot water temperature is equal to or higher than the set temperature only at the first time, the circulation pump is driven for a certain period of time so that the difference in hot water temperature between the upper and lower sides in the bathtub is eliminated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
After pressing the bath reservation switch 31 to make a reservation state, the time to take a bath is set by the hour and minute switches 32 and 33, and if the bath reservation switch 31 is pressed again, the reservation timer means 28 starts and the current time and reservation are made. Compares the time with the time, and stores the time obtained by subtracting a certain time during which the bath can be heated up from the reserved time before the reserved time, regardless of the season, and compares this time before the current time with the current time Also do.
[0007]
Then, the reservation timer means 28 starts automatic bath operation when a certain time before the arrival of a certain time, and the bath 17 from the hot water supply circuit 7 through the hot water filling circuit 23 at a temperature lower than the preset bathing temperature set by the user in advance. After the set amount of hot water is filled, the bath circulation circuit 16 performs reheating until the set temperature, and the bath is once boiled.
[0008]
Next, at the arrival of the reservation time, the reservation timer means 28 starts the heat insulation operation for 4 hours. That is, first, the circulation pump 21 is driven to circulate hot water in the bathtub 17 and the hot water in the bath thermistor 20 is circulated. The temperature is detected, and if the hot water temperature is lower than the bathing set temperature, the circulating pump 21 is continuously driven to reheat and raise to the set temperature. If the hot water temperature is higher than the bathing set temperature, the hot water is reheated. The operation of the circulating pump 21 is stopped without performing this operation, and this operation is performed at predetermined time intervals, and the hot water temperature is maintained at the set temperature for 4 hours. Even if the hot water temperature is equal to or higher than the bathing temperature, the circulation pump 21 is continuously driven for a certain period of time, so that the temperature difference between the upper and lower sides in the bathtub 17 is relaxed so that comfortable bathing can be performed.
[0009]
Therefore, the bath is boiled once at the reservation time, and since the heat insulation operation is started for the first time when the reservation time arrives, there is no useless heat insulation operation and it is energy saving. The probability of comfortable bathing is extremely high.
[0010]
【Example】
Next, an automatic bath apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes a main body of an automatic bath apparatus, which is provided with a heat exchanger 4 including a hot water supply heat exchanger 2 and a bath heat exchanger 3.
[0011]
Reference numeral 5 denotes a combustion section provided in the lower part of the heat exchanger 4, which blows combustion air to a petroleum vaporization burner 6 by a blower (not shown) and supplies fuel oil by a fuel pump (not shown). By doing so, combustion is performed.
[0012]
7 is a hot water supply circuit from the water intake pipe 8 to the hot water supply pipe 9 through the hot water supply heat exchanger 2, and the hot water flow sensor 11 prevents hot water from flowing from the water intake pipe 8 directly connected to the water pipe 10. Therefore, after detecting the water flow, detecting the temperature with the water supply thermistor 12, exchanging heat with the heat exchanger 2 for hot water supply, and then tap water entered from the inlet pipe 8 with the mixing valve 13 so as to reach the set temperature. The hot water thermistor 14 detects the temperature of the hot water and discharges the hot water from the hot water pipe 9 toward a faucet (not shown) connected to the downstream side of the mixing valve 13. Is provided with a water proportional valve 15 for preventing hot water temperature unevenness when intermittently supplying hot water.
[0013]
Reference numeral 16 denotes a bath circulation circuit that passes from the bathtub 17 through the forward pipe 18, through the bath heat exchanger 3, through the return pipe 19, and again to the bathtub 17, and from the bathtub 17 through the forward pipe 18 to the bath heat exchanger 3. A bath thermistor 20 that detects the temperature of the bath water flowing into the bath, a circulation pump 21 that lies between the outgoing pipe 18 and the bath heat exchanger 3 and circulates the bath water in the bath circulation circuit 16, and a bath It is located between the heat exchanger 3 and the return pipe 19 and is provided with a water flow switch 22 that detects the water flow of the bathtub water in order to prevent emptying.
[0014]
23 has one end connected to the hot water supply circuit 7 between the hot water supply port 9 and the hot water supply thermistor 14, and the other end passes through the three-way valve 24, passes through the forward pipe 18, passes through the bath heat exchanger 3, and returns to the return pipe 19. In the hot water filling circuit connected to the bath circulation circuit 16 between the circulation pump 21 and the bath heat exchanger 3 again through the bathtub 17, the opening and closing of the hot water supply circuit 7 and the hot water filling circuit 23 is controlled by the solenoid valve 25. This is performed by opening and closing, and the opening and closing of the bath circulation circuit 16 and the hot water filling circuit 23 is performed by the operation of the three-way valve 24. The hot water supplied from the hot water supply circuit 7 is detected by the hot water flow sensor 26 and vice versa. The stop valve 27 prevents the bath water in the bath circulation circuit 16 from flowing into the hot water supply circuit 7.
[0015]
Reference numeral 28 denotes a reservation timer means as a function in the microcomputer 29. When the bath reservation switch 31 provided in the remote controller 30 is pressed for the first time, the reservation timer means 28 enters a standby state. Then, by setting the desired bathing time and pressing the bath reservation switch 31 again, the bathing time is memorized, and the comparison with the current time is started.
[0016]
The reservation timer means 28 also calculates and stores a time obtained by subtracting a certain time during which the bath can be surely boiled regardless of the season from the bathing time, and a predetermined temperature lower than the set temperature for the bathtub 17 when this time arrives. After the filling of the temperature, the automatic bathing operation is performed to keep up with the set temperature, and the warming operation for 4 hours is started for the first time when the set bathing time arrives. However, when the temperature is equal to or higher than the set temperature, the circulation pump 21 is stopped after being continuously driven for a certain period of time.
[0017]
Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG.
First, after setting the bathing set temperature, as described above, the desired bathing time is set by the hour and minute switches 32 and 33, and if the bath reservation switch 31 is pressed, the reservation timer operation starts, and the reservation timer means 28 sets it. It is determined whether the current time has reached the time obtained by subtracting a certain time from the bathing time. (Step 35)
[0018]
Then, the process proceeds to step 36 with YES, the three-way valve 24 and the electromagnetic valve 25 are energized, combustion of the combustion section 5 is started, and hot water supply of the hot water supply circuit 7 is started via the hot water filling circuit 23. A predetermined amount of hot water several degrees lower than the set temperature is filled in the bathtub 17 to end the filling, and the routine proceeds to step 38 where the circulation pump 21 is driven to circulate the hot water in the bathtub 17 to the bath circulation circuit 16. When the set temperature is reached, the drive is stopped when the set temperature is reached, and the chasing ends in step 39. The bath is always heated up before the desired bathing time.
[0019]
Next, at step 40, the reservation timer means 28 waits for the arrival of the reservation time, and proceeds to step 41 to drive the circulation pump 21, and at step 42, determines whether the bath water temperature is lower than the set temperature. At the bathing time reserved over time, when the hot water temperature falls below the set temperature, the process proceeds to step 43 in YES, and the chasing is performed again. In step 44, it is determined whether the hot water temperature has increased to the set temperature. Then, the process proceeds to step 45 to finish the chasing and the driving of the circulation pump 21 is also stopped.
[0020]
Further, when the answer is NO in step 42, that is, when the time has not passed since the bath was heated up and the bath water temperature is equal to or higher than the set temperature, in step 46, the circulation pump 21 is first driven for the first time of the warming operation for bath reservation. The process proceeds to step 47 with YES, and the circulation pump 21 is continuously driven for a fixed time of 5 to 10 minutes so that the temperature difference between the upper and lower sides in the bathtub 17 is eliminated and a comfortable bathing is obtained. After this fixed time and when NO in step 46, the process proceeds to step 48 and the circulation pump 21 is stopped.
[0021]
Then, after both step 45 and step 48, the process proceeds to the same step 49, where it is determined whether or not 4 hours have elapsed from the start of the heat insulation operation. If NO, the process proceeds to step 50, and 30 minutes from the stop of the circulation pump 21. In step 41, the circulation pump 21 is driven again, that is, the bath water temperature is detected by driving the circulation pump 21 at regular time intervals. If YES in step 49 after 4 hours have elapsed, the heat insulation operation from this bath reservation is stopped.
[0022]
Therefore, the warming operation of the bath that has once boiled is started at the reserved bathing time, and it is highly probable that bathing at the set temperature will be possible by bathing after preparing for bathing, so that good bathing is always possible and wasteful. Energy saving automatic bath operation is obtained without excessive energy consumption.
[0023]
Furthermore, when the bath water temperature has reached the set temperature only for the first time at the start of the warming operation at the reserved time, the circulation pump is driven for a certain period of time and then stopped, so there is no temperature difference between the top and bottom of the bathtub and a comfortable bathing can be performed It is.
[0024]
【The invention's effect】
In short, according to the present invention, the warming operation of the bath that has once boiled is started at the reserved bathing time, and it is highly probable that bathing at the set temperature is possible by bathing after preparing for bathing. In addition, energy-saving automatic bath operation can be obtained without wasteful energy consumption.
[0025]
According to claim 2 of the present invention, when the bath water temperature has reached the set temperature only for the first time at the start of the heat retention operation at the reservation time, the circulation pump is stopped after being driven for a certain period of time. There is no temperature difference and you can enjoy a comfortable bath.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an automatic bath apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram of the main electric circuit.
FIG. 3 is a flowchart of the main part.
[Explanation of symbols]
2 Heat exchanger for hot water supply 3 Heat exchanger for bath 7 Hot water supply circuit 8 Inlet pipe 9 Outlet pipe 16 Bath circulation circuit 17 Bath 18 Outlet pipe 19 Return pipe 21 Circulation pump 23 Hot water filling circuit 28 Reservation timer means

Claims

A bath circulation circuit in which a bathtub and a heat exchanger for bath are communicated with an outgoing pipe and a return pipe provided with a circulation pump, and a hot water supply circuit in which a water inlet pipe, a hot water supply heat exchanger, and a hot water outlet pipe are sequentially connected. In addition, the bath circulation circuit and the hot water supply circuit described above are connected by a hot water filling circuit branched from the hot water discharge pipe, and after hot water filling at a predetermined temperature lower than a set temperature through the hot water filling circuit to the bathtub, It has an automatic bath operation function for performing a chasing operation up to a set temperature by a bath circulation circuit, and has a reservation timer means for performing the automatic bath operation a predetermined time before the set time, and this reservation timer means is set When the bath time arrives, the bath temperature is detected at predetermined time intervals, and after the set temperature is reached, the bath temperature is retraced to the set temperature and the bath temperature is kept at the set temperature for the specified time. Auto Lu apparatus.

2. The automatic bath apparatus according to claim 1, wherein in the heat insulation operation, the circulation pump is driven for a predetermined time even when the bath water temperature is equal to or higher than a set temperature only at the first time.