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Plumbing / Re: What kind of pump?

« on: February 27, 2011, 02:00:43 PM »

There is no circulator that will move water through 450' of 3/4" tube and survive very long. Keep a spare or two on hand. Just go with a Wilo S21 or a Grundfos 15-58. They'll both do about 2.5gpm under those conditions which is about all you are going to get out of 3/4" pex to begin with. Just for kicks, I ran your scenario on my computer and found that you would need about 3/4-1 Horsepower to get 5GPM out of your tube.

There is no more common problem out there than undersized tube.