The wattage of the heat pad won't matter much. It's the size of the heat pad that is important.
Pick the size that you need for your enclosure.
No matter the wattage, the heat will reach levels above safe for the snake and you will need a regulator.
The least you can do is buy a light switch dimmer from Home Depot for $10, but a $30 Hydrofarm thermostat is a much better investment.
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