I installed 3 - 100Watt heaters, One on oil pan, one on transmission pan, one on a flat spot I found on the engine. Right now I plug them in when I get up so they only run 1/2 hour before I actually leave. I've noticed about a 10F difference in temp between air intake temp and coolant temp (Scan Guage) at startup. Before I ran the heaters the two temperatures were almost always the same. So 300watts at 1/2 hour gives you a 10degree rise. I have a timmer so I could set it to run for an hour or more but have not done that yet. Just my experience.
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