UTH's do not come with a thermostat.
I don't know the room temps that the snake tank is in and so I don't know if you would need supplemental heating; probably not if you got the right sized UTH.
I would switch out the bark and go with a thin layer of aspen.
And lastly, since we're talking about changing your entire set-up (always a drag but most pet stores are notorious for handing out poor advice while taking consumer dollars) check out these reptile cages: http://www.reptilebasics.com/2x3-Cag...h-p-16286.html.
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