Heat pad as in "My back hurts, I think I'll use the heating pad on it." OR Heat mat as in specifically for reptiles (Under Tank Heater)?
Also, corns don't always drink right in front of you. Often times they'll get a drink when they are out cruising at night while you're not looking or while you're sleeping. I believe I only ever saw one of mine getting a drink (a few times) and that was only right after she had just eaten. Other than that, I never witnessed mine getting drinks.
This is especially important since he is new to you. You probably haven't had him long enough to have had a chance to seem him drink...and you still may never get to witness him getting a drink all by his lonesome. Corns don't suck down water several times a day. If he looks healthy and "happy", I wouldn't get too worried.
Also, if you wouldn't mind, it would be helpful (at least for me and I'm sure others as well) if you could change your font color. I have pretty good eyesight, but that green is hard for me to read :eek1: