I originally had a Kat's circulation type tank heater of the 1000W range that I got from Ebay. In fact, I'm selling it on ebay now as it will not work out for the way the civic has it's coolant hoses set up. Plus, it takes up much more room than the frost plug heater. It's just a personal preference on my part, but it was much easier to setup the OEM style thread in plug heater than trying find a lower hose adapter and plumb it all in.
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