KE's Eheim outlet got a crack in it, so I replaced the stock outlet with a 3/8" copper pipe to 1/2" NPT female fitting. That was held in place via JB Weld and it is secure and strong. The resulting setup is no more restrictive than it was before with a 1/2" barb in it (the 3/8" ID of the barb is the limit) and is less restrictive than stock with a 5/8" barb. It is normally used with a 1/2" NPT to 1/2" copper pipe fitting in it (even larger id than the 5/8" barb), but I used a 1/2"NPT to 1/2" barb in the testing since that's what the 1250 comes with stock.
The fact remains that the Eheim has been modified rather substantially even though I don't believe it was something that would affect the flow rates for the worse. Bill sees even worse performance than I do from the 1250, presumably with stock parts. Many people on forums have reported no difference in performance with 1250 vs 1048. I conclude from all of this that the P-Q curve is probably a bit "optimistic" for the 1250. If I ever have a brand new 1250 in my possession again I'll be sure to test it.
Now would you guys care to see this testing repeated with 3/8" tubing and dual rads and a GPU and CPU wb? Cause I think I am doing that next. Basically it would generate another Power line on Les's excellent figure with higher resistance. I'll try to get it started tonight.
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