Balanced Power Technology BPT3.5 running very hot

Hi, I just bought a used Balanced Power Technology BPT3.5 isolation transformer, and it runs very hot.  The case has no air vents on the body, just a metal case.  When I touch the side, it is hot but I can stay touching it.  But if I put my hand on the case right on top of the toroidal transformer, it is so hot that I can only touch it for maybe 10 seconds.  It gets hot even it is on idle, meaning I am not listening to music.  It is the “regular” model, not Signature, with a 20A transformer.  
 

To other BPT users, is this normal?  Does your unit get this hot while idling?

Is this safe to use?  My second question, since it gets so hot, does it mean it is drawing power even there is no load?

Thanks.