I use RBI plastics 32 quart, belly heat. I added extra holes in the tubs with a drill for airflow. I have 6 of them.

I use a ceramic heater, keep the room mid 70's. Some people like oil filled radiators, but with the RBI racks humidity is not a problem. When I get a couple ARS 30 slot CB70 racks, I will probably switch to an oil filled radiator.

Also, make sure you get a backup on/off thermostat. That 3" heat tape gets HOT and can cook your snakes and melt all your tubs. A backup is a must!

JonV