I voted back heat since hatchling racks have such a large number of tubs. The only reason I would make a hatchling rack with belly heat is if the room they are in gets really cold or if the dimensions allow me to convert it into an adult rack in the future.
This is a very good question and there is a lot of controversy over it. When it boils down to it, it all depends on your personal preference. I voted belly heat only because I found a better feeding response with the belly heat. However I have a rack that uses back heat and temps, and humidity were all fine. It depends on what works for you - if your making your rack, back heat is easier, cheaper, and safer to work with.
One thing I found however and is important to consider is that with back heat, I lost a lot of heat transfer from the tape to the bin. My thermostat is set to 107 in order to get a 88 - 92 degree reading on the back of the bin. Just a factor to be aware of.
Cheers.
Last edited by decensored; 11-02-2011 at 02:45 AM.