One quick note about UTH & substrate: in the post above, it was suggested to make the substrate deeper (for their sense of "security" & to hold humidity) BUT, if it's deep, the heat from a UTH has trouble rising at all- the deep substrate is acting as insulation, preventing the heat from rising into the cage where the snake needs it.
So for the best of both worlds, try keeping the substrate shallow over the UTH & putting the "warm hide" over it (or over at least part of it) to help contain the warmth. The rest of the tank (or enclosure) is fine with deeper substrate- it's just that UTH tends to be low wattage, & no matter what, it must be controlled (t-stat!) to a max. of 90* so your snake doesn't suffer thermal burns or neurological damage.
What I'm saying is, you don't want to crank up the UTH (trying to raise the ambient temperature) because even if you think it's safe (covered by deep substrate), understand that your snake can be counted on to push the substrate around & it then becomes a serious danger to them if it's not regulated by a thermostat to a maximum of 89*-90*. Please get a thermostat (or 2), A.S.A.P.![]()