PUMP FOR CIRCULATING HOT WATER

The present invention relates to a pump for circulating hot water. More specifically, the pump for circulating hot water is capable of discharging a part of fluid and air introduced into a lower portion of a pump chamber through a fluid discharge port without the loss of discharge pressure, such that the fluid smoothly flows, thereby improving the lifting efficiency of the pump and preventing the damage to an impeller, and thus, the durability of the impeller is enhanced. The pump for circulating hot water comprises: an upper housing having an inlet and an outlet to and from which the fluid is introduced and discharged and an upper shaft support portion formed on an inner central portion thereof; a lower housing disposed and installed corresponding to a lower side of the upper housing and having an accommodation space formed therein; an inner housing having an edge portion interposed on the upper and lower housings and a shaft support portion formed on a lower central portion of the bottom ...