As has been said, your snake room environment will determine whether a rheostat is a viable option for your BP.
A rheostat will provide CONSTANT HEAT. How much heat is determined by where you set the rheostat. A thermostat will provide VARIABLE HEAT depending upon the environment (as read by the thermostat sensor);
If your room temperature is constant throughout the day, a rheostat is a viable option. If your room temperature varies throughout the day, a rheostat may work but the temperature in your viv will vary along with your room temperature.
You need to decide how much variability in temperature you will tolerate in your viv. If your room temperature varies more than that, you must get a thermostat. If your room temperature varies less than that, you can go either way.
P.S. There is a reason why we use thermostats in our home and auto heating/cooling systems. They are the best way to provide a consistent temperature.
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