It is energy that you can convert to a mass equivalent with the e=mc^2 formula the temperature which you chosen to express it in F°

IF you heat a Kg of water by 1 F° you add to it 4.18*5/9 (to convert to C°) Joules of energy this equals 2.322 now you can apply the e=mc^2 formula.

The units you use are Mass Kilograms, c meters per second energy Joules, so the mass equivalent of the energy you have added is 2.322/9*10^16 kilograms.