getting a tub for second bp what do i need?

[anendeloflorien]

will the ambient temps stay in the 80's with just the uth. the temps in my house stays in the low 70's

It depends on the size of the tub you are trying to heat, how big the UTH is and how you have it orientated. You'll have to do some experimentation to get it right, give yourself at least a few days before you bring home your new snake to get the enclosure set up and get temperatures regulated.

One thing you can try, which I use on a couple of my colubrid tubs and tanks is putting a couple layers of aluminum foil directly on the bottom of the tub, in between the tub and the UTH. That will help spread out the heat a little more evenly and should prevent there being a hot spot directly over the UTH. Just use some aluminum foil tape (you can get it at Wal-Mart for about $8 for a roll that will last you forever) to tape it down.