oh it's a bigger rack than i had thought.
ok i take that back. i think it's one long strip of 3inch (maybe 4inch) heat tape. i can see heat tape running up the right side wall on that 2nd shelf from the top. not sure how she did it with the routered channel. if it's wired correctly and works, there's no need to replace it unless u wanna go with wider heat tape.
if you're set on a bigger rack/enclosure for your snakes in the future, i would save for and buy the CB70. if u wanna breed and have some clutches, i would negotiate w/ this guy for a lower the price and buy it for possible breeding.