Well to be completely honest this is my husband's boa (as much as any of our snakes are really "his" or "mine"). We got this cage off craigslist a couple years ago because we knew she'd one day need something at least this size (looks like she'll eventually size out of it at her rate of growth, but it'll work for her for awhile...and we already have it) and it was a good deal. It's about 24x48x12 inches. Similar to the animal plastics T8.

I don't see anyway to set this up with flexwatt as I would think it wouldn't be able to penetrate the bottom of the enclosure. It came with a RHP installed so we cleaned it up and discovered that the RHP did, in fact, work.

I just started thinking about it and thinking about how my balls pile themselves up into...well...balls and squish themselves between the top and bottom of their tubs and I'd hate for her to do this and burn herself from doing it between the bottom of the cage and the RHP. Now...I should probably preface this with she's not quite big enough to accomplish that right now...but she will one day and I don't want to discover that the day has arrived by her burning herself.