Efficiency is the ratio of benefit divided by effort. Due to its effectiveness, the HEATBALL as a work of art would have an Efficiency Class A.

The input energy that a heatball consumes is the effort, its heat is the benefit while light portion is the loss.

Hence the HEATBALL has an efficiency of 95%!

Due to its effectiveness, the HEATBALL as a work of art would have an Efficiency Class A.