Heating and hot water supply device

A heating and hot water supply device, comprising:

• a combustion part comprising a combustion blower,
• a heat exchanger that heats a heating medium with heat generated by the combustion part,
• a circulation passage that connects the heat exchanger and one or more external heating terminals,
• a circulation pump arranged in the circulation passage to circulate the heating medium,
• a bypass passage branched from the circulation passage and bypassing the heating terminal,
• a distribution valve for distributing the heating medium to the circulation passage and the bypass passage,
• a hot water supply heat exchanger arranged in the bypass passage,
• a water supply passage that supplies tap water to the hot water supply heat exchanger, and
• a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a prescribed hot water supply set temperature;
• wherein a distribution ratio of the distribution valve is adjustable so as to correspond to a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and
• the heating and hot water supply device comprises a changeover switch, which is configured to heat the heating medium to one or more heating terminal setting temperatures and to circulate the heating medium, and to switch a setting of the one or more heating terminal setting temperatures to be raised by a prescribed temperature during the simultaneous heating and hot water supply operation.