We tried the ReptiFLow and got an easy 10% boost just from the little 1" gurgling spigot of water - doesn't seem to bother Neph at all - in fact she will bask on the rock right next to it (guessing it's a lil more humid right near it). We're gearing up to build a couple humidifiers as well to test some stuff out. I'm guessing if you have the top covered just keeping the water circulating and the little bubbles popping where the flow goes back into the pool you should see a small boost.

We'll post some hard numbers when they are available.