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Update: The block heater survived the night. Just not sure about what long term effects insulation may have on it. I think it should be fine since the element is still submerged in coolant but I'm no engineer.
As for whether it worked any better, it may have by a few degrees. Last night we had a low of 46 degrees and the coolant heated up to 101 degrees according to my Scangauge. Night before last, we had a low of 49 degrees and the coolant reached 100 degrees.
I certainly wouldn't call a 4 degree difference over a single test conclusive by any means though as many other variables as there could have been such as varying winds.
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