To provide a hot water storage and supply system achieving the maximum hot water storage with exhaust heat and coping with a demand for hot water supply with high responsiveness without impairing the durability of equipment such as an auxiliary heat source part in particular when combining a main heat source part with the auxiliary heat source part.

A heat medium circulated and supplied from a heat medium circulating circuit 2 is utilized to carry out heat-exchange heating of hot and cold water or water supply in a hot water storage tank 7 by heat exchangers 6a, 6b for hot water storage and hot water supply. The heat medium using the cooling water exhaust heat of a gas engine as a main heat source is circulated and supplied to the heat exchanger 6a for hot water storage from the main heat source part 3 to store hot water by exhaust heat recovery, and the heat medium after passing through the heat exchanger 6a for hot water storage is supplied to the heat exchanger 6b for hot water supply after supplementarily heated by the auxiliary heat source part 4 to quickly carry out heat-exchange heating for hot water supply.

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