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I'm on this project right now. I decided to go with the plastic because
1. That's what was in there originally. (Or so I believe. I'll find out this week)
2. Shredding plastic seems a lot safer than shredding metal.
3. The low cost of the metal impellers really turned me off. While I believe the $100-$150 dollar pumps might be adequate for a year or two, I'd rather not have the thought of a cheap pump going through the back of my mind whenever I decide to take a road trip.
ETA: I went with the low temp thermostat for no particular reason other than it sounds cooler. (pun intended)
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