As long as everything you're plugging it into can handle the wattage and the heat (the thermostat, the fixture, etc) you might as well go with a higher wattage than you think you should need. The thermostat can always make a 100 watt CHE run at 50 watts if that's enough to get the temperature you need, but it can't make a 50 watt CHE run at 80 watts if 50 isn't enough.
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