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In my experience with my Matrix and its block heater which is 300 or 400W, I would have liked it to have been a more powerful heater. I'd rather have the heater one for a short duration of time and heat up quickly. With that block heater, I had to keep it on for 3-4 hours every morning to get the car up to ~90-100F in the morning, ambient was normally around 20F. I can only imagine I lost a ton of heat through the aluminum block and head during 3 hours of sitting there.
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