I left my coffee maker on this evening. I am 200 miles away from home
and won't be going back for another 2 days.  Should I be worried?  I
have one of those coffee makers where the dripping part turns off, but
the "heating pad" remains on to keep the coffee warm.  At most,
I think the glass will burst.  What do you all think?  I have asked a
friend to go by my apt periodically to make sure everything looks okay
and she can smell nothing burning...just curious if you all think I
should go back.

Well thinking about how you said that the glass container might
shatter from the heat, if there is any coffee in it, it could short it
out, in which three things my happen: 1.) It will short out and cause
a fire. 2.)It will short out from the coffee spilling, pop the circuit
breaker and the coffee maker will turn off. 3.) Nothing will happen.
And another thing that might happen, but very unlikely is that the
coffee might get moldy (yes, it can get moldy as there are sugars in
coffee) and the mold will produce enough noxious fumes to kill living
things, although the odds of that are about equal to winning the
lottery and then promptly getting struck by a meteor.