I am running a MaxiJet 1200. Rated 295GPH @ 0" of head; Max head is 69". I really have no idea what kind of GPH I'm getting at 18" of head and a kinda restrictive block, but I'm thinking 170ish. It makes abit of noise and add more heat to your water than most other pumps, but as long as you go pump-->rad-->block I don't think it's that big a deal. And for only $23 I gave it a shot.
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