In a heating and hot water supply apparatus, a heat exchanger for hot water supply includes a primary-side path and a secondary-side path. A bypass path branches from a heating circulation path and is configured such that a heat transfer medium heated by a heating device flows through the primary-side path without passing through a heating terminal when hot water supply operation is performed and then joins the heating circulation path again. A control unit controls a flow rate regulating valve so that a hot water flow rate does not exceed a reference limit flow rate when hot water supply operation is performed. The reference limit flow rate is set on the basis of the smaller one between a maximum heating capacity of the heating device and a heating capacity of the heating device at which an output temperature of the heated heat transfer medium reaches an upper limit temperature.

A combination boiler provides heated water to a boiler loop and domestic hot water (DHW) to a domestic water loop. The combination boiler includes a primary heat exchanger (PHE) connected to the boiler loop and a burner to provide heat to the primary heat exchanger. A secondary heat exchanger (SHE) transfers heat energy from the boiler loop to the domestic water loop. A controller monitors a PHE inlet temperature and a DHW output temperature, obtains a pre-heat initialization temperature threshold and a pre-heat cancellation temperature threshold, and detects a low temperature condition. A pre-heat operation is initiated responsive to the low temperature condition by circulating heated water from the PHE to the SHE. The burner is selectively fired at least in part according to an outlet temperature of the PHE.

A heating and hot water supply system, including: a combustion unit combusting a fuel to generate a combustion gas; a heat exchange unit heating a heat medium and hot water according to heat exchange with the combustion gas; an exhaust unit that exhausting the combustion gas after heat exchange The heat exchange unit includes a plate type heat exchanger by laminating vertically-upright rectangular plates with gaps, and is configured to heat the heat medium by causing the combustion gas and the heat medium to alternately flow through the gaps An inlet for the heat medium is provided at lower corner of the plate type heat exchanger, a discharge opening for the heat medium is provided at upper corner farthest from the inlet, and a hot water passage through which hot water flows in the plate type heat exchanger is provided at upper corner above the inlet.

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.

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.

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.

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.

A combination boiler provides heated water to a boiler loop and domestic hot water (DHW) to a domestic water loop. The combination boiler includes a primary heat exchanger (PHE) connected to the boiler loop and a burner to provide heat to the primary heat exchanger. A secondary heat exchanger (SHE) transfers heat energy from the boiler loop to the domestic water loop. A controller monitors a PHE inlet temperature and a DHW output temperature, obtains a pre-heat initialization temperature threshold and a pre-heat cancellation temperature threshold, and detects a low temperature condition. A pre-heat operation is initiated responsive to the low temperature condition by circulating heated water from the PHE to the SHE. The burner is selectively fired at least in part according to an outlet temperature of the PHE.

Disclosed is a water system that generates heated water and distilled water. The water system has a boiler configured to boil water to produce steam. The water system also has a condensing conduit to receive the steam, wherein thermal energy is removed to condense the steam into distilled water and to cool the distilled water. A heat exchanger is thermally coupled to the condensing conduit to remove a first portion of the thermal energy. The heat exchanger has a heating conduit configured to receive water and to heat the water using the first portion of the thermal energy to produce heated water. According to an embodiment of the disclosure, the water system also has a heat remover thermally coupled to the condensing conduit to remove a second portion of the thermal energy thereby cooling the distilled water in the condensing conduit.

Disclosed is a water system that generates heated water and distilled water. The water system has a boiler configured to boil water to produce steam. The water system also has a condensing conduit to receive the steam, wherein thermal energy is removed to condense the steam into distilled water and to cool the distilled water. A heat exchanger is thermally coupled to the condensing conduit to remove a first portion of the thermal energy. The heat exchanger has a heating conduit configured to receive water and to heat the water using the first portion of the thermal energy to produce heated water. According to an embodiment of the disclosure, the water system also has a heat remover thermally coupled to the condensing conduit to remove a second portion of the thermal energy thereby cooling the distilled water in the condensing conduit.