Heating and hot-water supply device

A heating and hot-water supply device comprising:

• a combuster;
• a heat exchanger for heating a heating heat-medium to a target heat medium temperature by heat generated by the combuster;
• a circulation passage for connecting the heat exchanger to an external heating terminal;
• a built-in pump provided in the circulation passage to circulate the heating heat-medium;
• a bypass passage branched off from the circulation passage and bypassing the heating terminal;
• a distribution valve for distributing the heating heat-medium to the circulation passage and the bypass passage;
• a hot-water supply heat exchanger provided in the bypass passage;
• a water supply passage for supplying tap water to the hot-water supply heat exchanger;
• and
• a hot-water supply passage for supplying water, which is heated by the hot-water supply heat exchanger, at a predetermined hot-water supply setting temperature,
• wherein the heating and hot-water supply device is configured to control at least the combuster, the built-in pump, and the distribution valve, and
• the heating and hot-water supply device is capable of adjusting a distribution ratio of the distribution valve to be adaptable to a heating operation, a hot-water supply operation, and a simultaneous heating and hot-water supply operation, and
• at the time of transition from the heating operation to the simultaneous heating and hot-water supply operation, in a case where the heating terminal for performing heating is a warm air heater, the heating and hot-water supply device raises the target heat medium temperature, and
• in a case where the heating terminal is not a warm air heater, the heating and hot-water supply device doesn't change the target heat medium temperature.