Running 5 KW through a receptacle fed by #12(if you’re lucky, some houses are wired with #14) is NOT advisable.
That would be because 5KW is about 40A single phase at 120V, and the wire in the receptacle is rated from for a max of 20A.
As the load goes up past 20A, the wire WILL heat up to the point where it will start a fire or more likely just burn through and need to be replaced.
Of course if your total load is below 20A it would be OK.
Running 110 solves that. They are only rated at 20a each
To add, a moron which you are not or a liberal, would likley find a way to burn his house down.