wow first tube amp

Up until today I had been using a audio refinement compelte as my amplifier. Today the UPS man dropped off the anthem integrated 1 I bought here on the gon. I was always curious as to how a tube amp would sound at such low wattage. I was dumfounded by the deep bass and musicality of what I was hearing. My feet were tapping more than ever and I was finally singing along with the music. Nevertheless I have the anthem driving my power hungry B&W'S. One thing I noticed, though, is that the amp runs extremely hot. Almost hot enough to burn my finger if I touch the top of the case. While I usually play my music at loud volumes is this normal for a tube amp or should I be concerned. I am afraid I may be damaging it by playing it at such low volumes.