Size of UTH?

[dadykhoff]

If you are going to buy an UTH, go with the 10-20gal one. You can cover the top of the tank with something (I use cardboard wrapped in aluminum foil). Also dont forget to get a thermostat or rheostat to control the UTH.

Do you have a recommendation for rheostat vs thermostat?

Thermostat sounds nice, but worries me in case it bugs out.