Abstract: A heating and hot water supply system includes: a combustion means; a heat exchanger; a heating terminal; a circulation passage that connects the heat exchanger and the heating terminal; a circulation means; a bypass passage branched from the circulation passage and bypassing the heating terminal; a distribution means for distributing a heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger for the bypass passage; and a hot water supply passage; wherein the distribution means can adjust the distribution ratio so as to correspond to a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and when the distribution ratio on the circulation passage side of the distribution means is smaller than a prescribed value during the simultaneous heating and hot water supply operation, the blowing operation of the blower at the heating terminal is prohibited.

Abstract: A heating and hot-water-supply apparatus is provided with: a control unit that performs control on the basis of detection parameters of a plurality of detection means installed at the aforementioned locations and a setting parameter set in an operation unit. The distribution means can adjust the distribution ratio so as to correspond to a heating operation, a hot-water supply operation, and the simultaneous heating and hot-water-supply operation. The control unit prohibits the simultaneous heating and hot-water-supply operation in a case in which the required heating capacity for the hot-water supply operation calculated on the basis of the detection parameters and the setting parameter is equal to or greater than a predetermined standard capacity.

Abstract: Provided is a heating and hot water supply device. The heating and hot water supply device includes: a combustion part; a heat exchanger; a circulation passage; a circulation part; a bypass passage; a distribution means for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger; a water supply passage; and a hot water supply passage (21). The distribution ratio of the distribution means is adjustable so as to correspond to a heating operation, a hot water supply operation, and the simultaneous heating and hot water supply operation. The heating and hot water supply device includes an operation part, which heats the heating medium to one or more heating terminal setting temperatures and circulates the heating medium, and switches a setting of the one or more heating terminal setting temperatures to be increased by a prescribed temperature during the simultaneous heating and hot water supply operation.

Abstract: When a hot water supply operation is started, a single mode is used in which hot water is output only from a second hot water supply circuit of a water heater, by cut-off of a flow path in a first hot water supply circuit of a space-heating water heater by a cut-off mechanism. When a load imposed by hot water supply by the second hot water supply circuit increases during the hot water supply operation in the single mode, the cut-off mechanism is opened to start hot water output from the first hot water supply circuit and a hot water supply operation in a parallel mode is performed in which hot water is output from both of the first hot water supply circuit and the second hot water supply circuit.

Abstract: A hot water heating system is provided with: a hot water heating device; a heating terminal; a heat circulation circuit; a circulation means; and an expansion-absorbing means. The hot water heating device is provided with: a heating passage; a heating means for heating a heat medium inside the heating passage; a pressure detection means; a supply passage connected to the heating passage; an opening/closing means for the supply passage; and a control means which opens the opening/closing means to supply the heat medium when the internal pressure of the heating passage is less than a reference value. The control means determines that the positional relationship between the circulation means and the expansion-absorbing means is inappropriate when the pressure detected by the pressure detection means at the moment the circulation means starts to be driven is lower than the pressure detected prior to driving the circulation means.

Abstract: A heating and hot-water-supply apparatus is provided with: a control unit that performs control on the basis of detection parameters of a plurality of detection means installed at the aforementioned locations and a setting parameter set in an operation unit. The distribution means can adjust the distribution ratio so as to correspond to a heating operation, a hot-water supply operation, and the simultaneous heating and hot-water-supply operation. The control unit prohibits the simultaneous heating and hot-water-supply operation in a case in which the required heating capacity for the hot-water supply operation calculated on the basis of the detection parameters and the setting parameter is equal to or greater than a predetermined standard capacity.

Abstract: A heating and hot water supply system includes: a combustion means; a heat exchanger; a heating terminal; a circulation passage that connects the heat exchanger and the heating terminal; a circulation means; a bypass passage branched from the circulation passage and bypassing the heating terminal; a distribution means for distributing a heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger for the bypass passage; and a hot water supply passage; wherein the distribution means can adjust the distribution ratio so as to correspond to a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and when the distribution ratio on the circulation passage side of the distribution means is smaller than a prescribed value during the simultaneous heating and hot water supply operation, the blowing operation of the blower at the heating terminal is prohibited.

Abstract: Provided is a heating and hot water supply device The heating and hot water supply device includes: a combustion part; a heat exchanger; a circulation passage; a circulation part; a bypass passage; a distribution means for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger; a water supply passage; and a hot water supply passage (21) The distribution ratio of the distribution means is adjustable so as to correspond to a heating operation, a hot water supply operation, and the simultaneous heating and hot water supply operation. The heating and hot water supply device includes an operation part, which heats the heating medium to one or more heating terminal setting temperatures and circulates the heating medium, and switches a setting of the one or more heating terminal setting temperatures to be increased by a prescribed temperature during the simultaneous heating and hot water supply operation.

Abstract: When a hot water supply operation is started, a single mode is used in which hot water is output only from a second hot water supply circuit of a water heater, by cut-off of a flow path in a first hot water supply circuit of a space-heating water heater by a cut-off mechanism. When a load imposed by hot water supply by the second hot water supply circuit increases during the hot water supply operation in the single mode, the cut-off mechanism is opened to start hot water output from the first hot water supply circuit and a hot water supply operation in a parallel mode is performed in which hot water is output from both of the first hot water supply circuit and the second hot water supply circuit.

Abstract: A heating device with hot water supply function includes: a combustion means; a first heat exchanger; a circulation passage that connects the first heat exchanger and an room heating unit; a circulation pump; a bypass passage that branches off from the circulation passage; a second heat exchanger for hot water supply provided in the bypass passage; a cold water supply passage; a hot water supply passage for supply of hot water from the second heat exchanger; and a distribution means that is provided at a branching section and whose distribution ratio can be adjusted, so that it becomes possible selectively to execute either only room heating operation, or only hot water supply operation, or simultaneous room heating operation and hot water supply operation; wherein the hot water supply outlet, the thermal medium inlet, and the room heating outlet of the distribution means are at the same height.

Abstract: A heating device with hot water supply function includes: a combustion means; a main heat exchanger; a circulation passage connecting the main heat exchanger to an heating apparatus; a circulation pump provided in the circulation passage; a bypass passage that branches off from the circulation passage and bypasses the room heating apparatus; a secondary heat exchanger provided in the bypass passage; a cold water supply passage for supplying cold water to the secondary heat exchanger; a hot water supply passage for supplying hot water heated by the secondary heat exchanger; a hot water supply bypass passage that connects the cold water supply passage to the hot water supply passage bypassing the secondary heat exchanger; a flow adjustment means for adjusting the flow rate in the hot water supply bypass passage and thereby controlling the temperature of hot water to be supplied; and an expanded passage portion of the hot water supply passage whose diameter is increased from an intermediate portion of the hot wa