A heating control system configured to control a water circulating pump configured to change a flow rate of a heat medium that circulates through a heat source device and a heat radiation device via a pipe, the heating control system comprising: an outflow temperature sensor configured to detect an outflow temperature of the heat medium that flows out of the heat source device; an inflow temperature sensor configured to detect an inflow temperature of the heat medium that flows into the heat source device; and a controller configured to control the water circulating pump, to thereby control the flow rate of the heat medium, characterized in that the heating control system further comprises a flow sensor configured to measure the flow rate of the heat medium flowing through the pipe, and the controller includes a data collection unit configured to collect heat medium information that comprises the flow rate of the heat medium measured by the flow sensor, the outflow temperature detected by the outflow temperature sensor, and the inflow temperature detected by the inflow temperature sensor, a lower limit flow rate calculation unit configured to calculate a lower limit flow rate of the heat medium that flows when a minimum amount of heat is supplied by the heat source device, based on the heat medium information collected by the data collection unit, and a flow rate control command unit configured to control the water circulating pump based on the lower limit flow rate calculated by the lower limit flow rate calculation unit. an outflow temperature sensor configured to detect an outflow temperature of the heat medium that flows out of the heat source device; an inflow temperature sensor configured to detect an inflow temperature of the heat medium that flows into the heat source device; and a controller configured to control the water circulating pump, to thereby control the flow rate of the heat medium, characterized in that the heating control system further comprises a flow sensor configured to measure the flow rate of the heat medium flowing through the pipe, and the controller includes a data collection unit configured to collect heat medium information that comprises the flow rate of the heat medium measured by the flow sensor, the outflow temperature detected by the outflow temperature sensor, and the inflow temperature detected by the inflow temperature sensor, a lower limit flow rate calculation unit configured to calculate a lower limit flow rate of the heat medium that flows when a minimum amount of heat is supplied by the heat source device, based on the heat medium information collected by the data collection unit, and a flow rate control command unit configured to control the water circulating pump based on the lower limit flow rate calculated by the lower limit flow rate calculation unit. a data collection unit configured to collect heat medium information that comprises the flow rate of the heat medium measured by the flow sensor, the outflow temperature detected by the outflow temperature sensor, and the inflow temperature detected by the inflow temperature sensor, a lower limit flow rate calculation unit configured to calculate a lower limit flow rate of the heat medium that flows when a minimum amount of heat is supplied by the heat source device, based on the heat medium information collected by the data collection unit, and a flow rate control command unit configured to control the water circulating pump based on the lower limit flow rate calculated by the lower limit flow rate calculation unit.