HOT WATER SUPPLY SYSTEM

To suppress the occurrence of a peak of a power demand caused by concentration of boiling operations in multiple dwelling houses.SOLUTION: A hot water supply system of the present disclosure classifies a plurality of water heaters into first to third groups according to necessary boiling time necessary for boiling operations of the plurality of water heaters, sets a boiling execution period to each group, and adjusts a heating capacity of each water heater for each group. The water heaters are classified so that the necessary boiling time of the water heaters of the groups becomes long in order of the first, the second and the third groups. The boiling execution period of each group is set to a temporary period at which superimposition becomes small on condition that the boiling execution time is firstly accommodated within a specified time zone. Then, when there is a period in which the temporary periods of the groups are superimposed on one another as a whole, the boiling execution periods of the first and the second groups are set once again so that the superimposition period of the temporary periods of the first and the second groups on the temporary period of the third group coincides with the temporary period of the third group. The heating capacity of the first or the second group is lowered within a range in which a boiling calorie of the superimposition period is not changed.SELECTED DRAWING: Figure 3 【課題】集合住宅の沸上運転の集中による電力需要のピーク発生を抑制する。【解決手段】本開示の給湯システムは、複数の給湯機の沸上運転に要する必要沸上時間に応じて、複数の給湯機を第１～第３のグループに分類し、各グループに対し沸上実行期間を設定し、グループごとに各給湯機の加熱能力を調整する。各給湯機は、各グループの給湯機の必要沸上時間が、第１、第２、第３グループの順に長くなるように分類される。各グループの沸上実行期間は、まず沸上実行期間が特定の時間帯に収まることを条件に、重複が少なくなる仮期間に設定される。そして各グループの仮期間が全て重複する期間があれば、第１、第２の仮期間のうち第３グループの仮期間との重複期間が第３グループの仮期間と一致するように第１、第２グループの沸上実行期間が再設定される。第１又は第２グループの加熱能力は、重複期間の沸上熱量を変更しない範囲で下げられる。【選択図】図３