To provide a storage floor heating system largely reducing initial costs for floor heating.

This storage floor heating system consists of a heat pump 1 heating a medium used only for floor heating using only midnight power, a thermal storage tank 2 placed in an underfloor space and reserving the heating medium, a floor heater 3 heating the floor by the heating medium, a heating medium circuit 4 for thermal storage introducing the high temperature heating medium heated by the heat pump 1 into the thermal storage tank 2 and the low temperature heating medium inside the thermal storage tank 2 into the heat pump 1, and a heating medium circuit 5 for heating introducing the high temperature heating medium inside the thermal storage tank 2 into the floor heater 3 and the low temperature heating medium from the floor heater 3 into the thermal storage tank 2.