While using solar energy to create electricity is about 12 -15 % efficient, absorbing solar energy to heat water can be as high as 75% efficient.
(absorbing solar energy; can be; as high as 75% efficient) (using solar energy to create electricity; is; about 12 -15 % efficient)
absorbing solar energy using solar energy to create electricity
can be is
as high as 75% efficient
about 12 -15 % efficient