First off never get a snake because it's cool looking. Western hognose snakes do have a venom so the most care and respect should be exercised when handling them.
Yes they need a UTH, about like a corns heat. 85 hot side 70 cool side.
Aspen is the best choice since they are burrowers. about 2-3 inches of it, because of this you have to feed out of the enclosure.
Males get to about 2ft, and females get up to 3ft.
For a male they can live in a 10 gal tank all it's life. But a female should be housed in a 15-20 (long) gal tank.
DO RESEARCH BEFORE GETTING ANY HERP.
-----
1.1 Ball Python, 0.1 motley amel corn, 0.1 western hognose