I ordered one of these pumps, And the one I got was 4.5 gal per hour at 50 psi, is that to much or will it work ok. I ordered one that is 1.5 gph at 150 psi but got the wrong one, just wandering if I should go thru all the trouble of getting the write one. I am kind of in a hurry to get this heater going. Brad

another question about this pump. Does it come with metric fittings, and can I hook up flexible copper tubing to it.