HOT WATER STORAGE AND HOT WATER SUPPLY HEATING APPARATUS

PROBLEM TO BE SOLVED: To provide a hot water storage and hot water supply heating apparatus capable of properly utilizing heating capability of an auxiliary heat source machine when utilizing hot water heated by the auxiliary heat source machine simultaneously for heating and hot water supply.SOLUTION: A hot water storage and hot water supply heating apparatus comprises: a hot water storage tank 2 in which hot water heated by heating means is stored; an auxiliary heat source machine 3 provided at a hot water supply passage; a hot water circulation circuit 14 which branched off from the hot water supply passage downstream from the auxiliary heat source machine and which is connected to the hot water supply passage upstream from the auxiliary heat source; a heat exchanger 15 provided at the hot water circulation circuit; and a three-way valve 5 provided at a connection part between the hot water supply passage and the hot water circulation circuit. The hot water storage and hot water supply heating apparatus simultaneously performs: a hot water supply operation in which hot water in the hot water storage tank and hot water of the hot water circulation circuit are mixed together and then the hot water heated by the auxiliary heat source machine from the hot water supply passage is supplied; and a circulation operation in which the hot water heated by the auxiliary heat source machine at the heat exchanger is utilized, a mixing rate of the three-way valve being a mixing rate of a necessary hot water supply rate needed for the hot water supply operation and a calculated necessary circulation flow rate needed for the circulation operation.SELECTED DRAWING: Figure 4 【課題】補助熱源機により加熱された湯水を暖房と給湯に同時利用する場合、補助熱源機の加熱能力を適切に利用可能な貯湯給湯暖房装置を提供する。【解決手段】加熱手段により加熱された湯水を貯留する貯湯タンク２と、出湯通路に設けられた補助熱源機３と、補助熱源機より下流側の出湯通路から分岐されて補助熱源機より上流側の出湯通路に接続された湯水循環回路１４と、湯水循環回路に設けられた熱交換器１５と、出湯通路と湯水循環回路の接続部に設けられた三方弁５とを備え、貯湯タンクの湯水と湯水循環回路の湯水を混合して補助熱源機により加熱した湯水を出湯通路から出湯する給湯運転と、補助熱源機により加熱した湯水を熱交換器にて利用する循環運転の同時運転を行う貯湯給湯暖房装置において、三方弁の混合比率は、給湯運転に必要な給湯必要流量及び循環運転に必要な循環必要流量を算出し、これらの比率に応じた混合比率とする。【選択図】図４