The machines will not draw anymore than a regular refridgerator. I have a USS-64 that I use everyday. It is plugged in to a GFI outlet but not on a dedicated circuit. Although, it is in the basement and the rest of the plugs do not get normal use. You should inspect all of the wiring on those machines and install a new wiring harness if the old wire is at all suspect. I guess your suggestion of a dedicated circuit for the machine makes sense. I will have to add that to my basement remodel plans.
Tim