Assume that the power of the circulating pump in the floor heating pipeline is P watts and the running time is t hours. The relationship between electric energy (e) and power (p) and time (t) can be expressed by the following mathematical formula: E=P×T, which shows that electric energy is the product of power and time.

In this problem, P=750 watts and T=24 hours. Substitute these values into the formula and you can get the answer. The calculation results show that the electric energy consumed by the circulating pump of 750 watt floor heating pipeline for 24 hours is 18 degrees.