As for heat tape.. Its called flexwatt. Any other heat tape (like for your pipes) from a hardware store will likely NOT be what you would want.

Any heat source must be controlled by a thermostat control device. Otherwise they are known to get to temeratures over 115 degrees. This can crack glass, melt plastic, and BURN your snake.

You can pick these up online for pretty cheap if you get the one with a dial. These should be used in conjunction with a thermometer so you can monitor the temp and adjust accordingly since they are not digital. The digital ones and the proportional control (like a dimmer switch) are much more expensive but well worth it.

I wouldnt use heat tape unless you have an entire rack of snakes. You must wire it yourself including the cord..

An UTH is fine with the right temp control.

Lights and overhead heat emitters can suck out the humidity pretty fast. If you use these, cover the top of tank around the heat or light source. Use a more dense layer of cypress or aspen bedding to increase humidity a little but watch out for mold or condensation.