I have one, from factory. I still haven't used it beause as I understand it they use hella power. In any case I haven't actually even looked if the stock heater is installed into a freeze plug or otherwise. I think your post will inspire me to look later tonight and maybe give it a try. I know I got a really, really long extension cord just for it so... What I really wanted to do was figure out how long it takes to heat up and then have a timer on the outlet I was using so that it only uses power to heat up the block right before I leave for work.
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