Why not just use the 3 inch flexwatt? It is higher wattage but all flexwatt MUST be use with a T-stat anyway. The lower wattage 4 would run a bit cooler maxed out but as it is not recommended for sustained temps that even approach max (I have seen not more than 100ºF and also 95ºF and flexwatt maxed at 160+ typically) it is a bit of a moot point.
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