1. Calculate the sq. ft. of your pool. (LxW)
2. Multiply the sq. ft. x .5 (sq. ft. required)
3. Divide the sq. ft. x 40 (40 sq. ft. coverage in each 10' panel box)

4. Divide the sq. ft  x 32 ( 32 sq. ft coverage in each 8' panel box )

This number represents the number of boxes required to heat a pool at 50% coverage.