Here is another option you can do. I have done this, and it works!

Fill the 20 gal tank with aspen so that the level is just about 6-7 inches from the top. You can use the cheap aspen for rodents for most of that, then use the nice snake aspen for the last 2 inches or so.

Now turn off your undertank heater and use the CHE only. Place some sheets of newspaper or packing paper (rolls sold in Home Depot, inexpensive brown newspaper-like paper) on top of the aspen below the CHE. The snake will hide under the paper. You can also partially bury a plastic box or Cool Whip container with sphagnum moss under the paper.

CHE's are great when the snake can be under something and still heat up.

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