That tank is a regular style Aquarium which is higher than a 20L or 30L terrarium so your Che's or whatever above heat source will have a hard time getting the heat low enough to where the snake need ambiant temps to be 76+. On top of that heat rises so you have to use Tin Foil/Plexiglass or something to keep heat fron escaping and to keep humidit above 50% ....the UTH will atleast provide Belly heat for a Hot Spot but that ambient being under 76 is no good.
Id say the biggest tank you want is a 20L for a young BP. Ideally a Animal Plastics T8 is best. No worrying about heat loss ect. They are on sale now for $150.
http://www.apcages.com/home/
Go look at the first 2 STICKYS also under "Husbandry". One is for a Glass tank setup and one for a PVC like the AP-T8 enclosures.