Current draw from an MIT Z Stablizer ll

I find it very beneficial but would like an idea of power wasted. Thanks for the help. (For those who don't know of these older products they are designed to remove noise ie energy outside the 50 to 60 cycle range and to improve "power factor" which is is the term used to describe how "in phase" the voltage and amperage functions of the power are. The closer the match the better the overall power delivery).