Heat recovery system

The invention relates to a heat recovery system characterized by comprising a compressor; an air supply passage for supplying compressed air from the compressor to a compressed air utilization machine; a first heat recovery heat exchanger disposed in the air supply passage and capable of heating water supplied by the heat of compressed air to produce warm water; a water supply way for supplying water to the first heat recovery heat exchanger; a water supply valve and/or a water supply pump disposed in the water supply way; and a temperature sensor disposed on the downstream-side water supply passage of the first heat recovery heat exchanger, adjusting the opening degree of the water supply valve, or performing converter control on the water supply pump to adjust a flow rate to maintain the detected temperature of the temperature sensor at the set temperature. The heat recovery system can be operated in accordance with the running load of the warm water or for obtaining the warm water with desired temperature, and a system that does not affect the cooling of the compressor can be formed even if the amount or temperature of the warm water to is adjusted.